TY - JOUR. T1 - A characterization of the mechanical behavior of resin-infiltrated dentin using nanoscopic Dynamic Mechanical Analysis. AU - Ryou, Heonjune. AU - Pashley, David H.. AU - Tay, Franklin R.. AU - Arola, Dwayne. PY - 2013/7/1. Y1 - 2013/7/1. N2 - This study explored the spatial variations in mechanical behavior of resin-infiltrated dentin using nanoscopic Dynamic Mechanical Analysis (DMA). Objective The objectives were to: (1) evaluate the mechanical behavior of resin-infiltrated dentin using a scanning-based approach to nanoindentation, (2) identify contributions of the collagen matrix to time-dependent deformation of the hybrid layer, and (3) assess the importance of specimen hydration on the nanoDMA response. Methods Specimens of completely demineralized dentin infiltrated with commercial resin adhesive and control samples of resin adhesive were evaluated using a nanoindenter in scanning mode. The load and displacement responses were used to perform DMA and to estimate the complex ...
The technique of vibrational analysis with scanning probe microscopy allows probing vibrational properties of materials at the submicrometer scale, and even of individual molecules. This is accomplished by integrating scanning probe microscopy (SPM) and vibrational spectroscopy (Raman scattering or/and Fourier transform infrared spectroscopy, FTIR). This combination allows for much higher spatial resolution than can be achieved with conventional Raman/FTIR instrumentation. The technique is also nondestructive, requires non-extensive sample preparation, and provides more contrast such as intensity contrast, polarization contrast and wavelength contrast, as well as providing specific chemical information and topography images simultaneously. Near-field scanning optical microscopy (NSOM) was described in 1984, and used in many applications since then. The combination of Raman scattering and NSOM techniques was first realized in 1995, when it was used for imaging a Rb-doped KTP crystal at a spatial ...
This meeting covers a wide range of topics associated with Scanning Probe Microscopy including main techniques such as atomic force microscopy and scanning tunnelling microscopy as well as more specialised versions.. The SPM Meeting is held annually and provides an excellent forum for the community to meet and discuss the latest advances in the field. With an exhibition alongside and social activities organised, it is one of the best events for 2016 for scanning probe microscopy users, for PhD students and well-seasoned microscopists alike!. Abstracts will be accepted to this meeting for oral and poster presentations ...
Leiden Probe Microscopy B.V. (LPM) has the responsibility of designing and fabricating the experimental instruments needed for the high temperature x-ray and Raman measurements for this project. LPMs expertise is the development of tools for surface-science methods including scanning probe microscopy, x-ray diffraction, and optical methods with strong focus on the in situ studies of heterogeneous catalysis and surface chemistry. They also provide a complete set of tools ranging from reactive gas mixing systems, gas analyzers, x-ray reactors, optical characterization facilities, and high-speed control electronics.. ...
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Noncontact potentiometry or scanning Kelvin probe microscopy (SKPM) is a widely used technique to study charge injection and transport in (in)organic devices by measuring a laterally resolved local potential. This technique suffers from the significant drawback that experimentally obtained curves do not generally reflect the true potential profile in the device due to nonlocal coupling between the probing tip and the device. In this work, we quantitatively explain the experimental SKPM response and by doing so directly link theoretical device models to real observables. In particular, the model quantitatively explains the effects of the tip-sample distance and the dependence on the orientation of the probing tip with respect to the device.. ...
Scanning Probe Microscopy (SPM) combined with nanomechanical testing provides the ability to rapidly visualize the topography of the surface prior to testing and position the nanoindentation probe on the desired test region with nanoscale precision. Additionally, post-test SPM imaging provides confirmation that the measurement was conducted in the desired testing location and valuable information regarding material deformation behavior.
Link ping University Scanning Probe Microscopy Home Page - Laboratory of Applied Physics, Department of Physics and Measurement Technology (IFM) , Link ping University , Sweden ...
This tutorial will provide an overview of scanning probe microscopy (SPM) and its application towards problems in molecular conduction. In an effort to communicate the power and limitations of these instruments, the tutorial will describe design considerations and reveal the detailed construction of a cryogenic variable temperature ultra-high vacuum scanning tunneling microscope. With the microscope complete, the tutorial will then discuss its use for a variety of techniques that have been used to study the properties and performance of molecular-scale electronic devices.
Park NX-Bio enables that with its innovative in-liquid imaging Scanning Ion Conductance Microscopy (SICM) and its highly acclaimed Atomic Force Microscopy (AFM) technology.
Ultra-Low Damping Imaging Mode Related to Scanning Probe Microscopy in Liquid - Provided are methods and systems for high resolution imaging of a material immersed in liquid by scanning probe microscopy. The methods further relate to imaging a material submersed in liquid by tapping mode atomic force microscopy (AFM), wherein the AFM has a microfabricated AFM probe comprising a nanoneedle probe connected to a cantilever beam. The nanoneedle probe is immersed in the liquid, and the rest of the AFM probe, including the cantilever beam to which the nanoneedle probe is attached, remains outside the liquid. The cantilever is oscillated and the nanoneedle probe tip taps the material to image the material immersed in liquid. In an aspect, the material is supported on a shaped substrate to provide a spatially-varying immersion depth with specially defined regions for imaging by any of the methods and systems of the present invention ...
An all-digital cantilever controller for magnetic resonance force microscopy (MRFM) was developed through a close collaboration between SC Solutions, Cornell University, and the U.S. Army Research Laboratory. The advantage of an all-digital controller is its absence of thermal drift, as well as its great tuning flexibility. This versatile controller is comprised of a Field Programmable Gate Array (FPGA) connected via a low-latency interface to an analog input, an analog output, and a Digital Signal Processor (DSP) with additional analog outputs. Performance of the controller was demonstrated in experiments employing ultrasensitive silicon microcantilevers fabricated at Cornell Universitys Nanoscale Science and Technology Facility. The all-digital cantilever controller successfully measured millihertz shifts in the resonance frequency of these ultrasensitive microcantilevers on a millisecond timescale. Independently, a noise floor of 40 microHerz was measured for this controller.
Combining scanning probe microscopy with electrical transport measurements is a powerful approach to probe low-dimensional systems. The local information provided by scanning probe microscopy is invaluable for studying effects such as electron-electron interactions and scattering. Using this approach, we have probed the local electronic properties of mono- and bilayer graphene with atomic resolution. We studied the effect of ripples, charged impurities and defects on the local density of states. We find that long-range scattering from ripples and impurities shifts the Dirac point leading to electron and hole puddles. Short-range scattering from lattice defects mixes the two sublattices of graphene and tends to be strongly suppressed away from the Fermi energy. In addition, in bilayer graphene we observe an opening of a band gap due to the application of a transverse electric field. ...
Jülich, 26 November 2014 - Van der Waals forces act like a sort of quantum glue on all types of matter. Using a new measuring technique, scientists from Forschungszentrum Jülich experimentally determined for the first time all of the key details of how strongly the single molecules bind to a surface. With an atomic force microscope, they demonstrated that the forces do not just increase with molecular size, but that they even grow disproportionately fast. Their findings have been published in Nature Communications and could help to improve fundamental simulation methods for chemistry, physics, biology, and materials science.
Lec 4 - Coping with Smallness and Scanning Probe Microscopy Freshman Organic Chemistry (CHEM 125) This lecture asks whether it is possible to confirm the reality of bonds by seeing or feeling...
Delays in obtaining medical results from laboratory testing facilities is a well recognised bottleneck in the medical community. Employing methods that utilise real time electronic sensing could recover this potentially life-saving lost time. Such sensors have many applications within the medical field including detection of infectious diseases, biological or chemical weaponry, glucose sensors for diabetic patients, and many more. However we are approaching a time in human history when antibiotics may no longer be an effective way to treat bacterial infections, and as such we have chosen to pursue a bio-sensing device for antibiotic resistant enzymes. Due to the rise of antibiotic resistance in so called super-bugs compounded with the well documented medical bottleneck that results in long waiting times for test results, there is a call for real time bio-sensing devices that can detect antibiotic resistance. Presented in this thesis is work towards a real time bio-sensing device designed to ...
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Global Immunoprotein Market 2017-2022: Country Shares, Competitive Strategies, Volume and Sales Segment Forecasts--US, Europe (France, Germany, Italy, Spain, UK), Japan--Technology Trends, Instrumentation Review, Emerging Opportunities. Complete report $8,500. DataPack (test volumes, sales forecasts, supplier shares) $5,500.. This new 297-page report from VPGMarketResearch.com contains 72 tables and provides analysis of the global immunoprotein diagnostic market, including emerging tests, technologies, instrumentation, sales forecasts by country, market shares, and strategic profiles of leading suppliers. The report provides test volume .... January 2018 , $0 ,View Details>> ...
In addition to the other advice already given:. 1) Reduce the physical size of your sample as small as possible. More mass = more thermal vibrations.. 2) Reduce the temperature of your sample (and room) as much as feasible and comfortably possible. 3) Dont place your AFM on a table. It should be mounted on a heavy slab which is in turn suspended by a system of springs, much like a DJ spinning board for techno music. If you dont have such a setup, use the heaviest table you can find.. 4) If possible, use an adhesive to attach your sample to a holding chip, but use as little adhesive as possible. Allow at least 24 hours after affixing with the adhesive before imaging, to relieve tension.. 5) If possible, load the AFM, focus, and then allow it to sit for several hours (or an entire day) in order to come to total thermal equilibrium and reduce thermal drift and vibrations. ...
Welcome! Nanopaprika was cooked up by Hungarian chemistry PhD student in 2007. The main idea was to create something more personal than the other nano networks already on the Internet. Community is open to everyone from post-doctorial researchers and professors to students everywhere.. There is only one important assumption: you have to be interested in nano!. Nanopaprika is always looking for new partners, if you have any idea, contact me at [email protected] ...
With our dedicated customer support team, 30-day no-questions-asked return policy, and our price match guarantee, you can rest easy knowing that were doing everything we can to save you time, money, and stress.. ...
SiMPore is commercializing a novel membrane technology enabling new discoveries while also reducing the time and cost of everyday development processes in the life sciences. SiMPore is a Rochester, New York-based nanotechnology company that designs and produces membranes and membrane-enabled products based on its unique patent-pending platform technology - the UltraSM ultrathin nanoporous silicon membrane. The UltraSM membrane is the worlds first membrane to offer both tunable nanometer-scale thickness and pore size. SiMPore is developing products that take advantage of these one-of-a-kind features, including filters for separating and concentrating biological molecules and nanoparticles, cell culture substrates for growing cells, and electron microscopy grids for preparing and imaging samples at the nanoscale ...
TY - JOUR. T1 - Functional biomimetic analogs help remineralize apatite-depleted demineralized resin-infiltrated dentin via a bottom-up approach. AU - Kim, Jongryul. AU - Arola, Dwayne D.. AU - Gu, Lisha. AU - Kim, Young Kyung. AU - Mai, Sui. AU - Liu, Yan. AU - Pashley, David Henry. AU - Tay, Franklin Chi Meng. PY - 2010/1/1. Y1 - 2010/1/1. N2 - Natural biominerals are formed through metastable amorphous precursor phases via a bottom-up, nanoparticle-mediated mineralization mechanism. Using an acid-etched human dentin model to create a layer of completely demineralized collagen matrix, a bio-inspired mineralization scheme has been developed based on the use of dual biomimetic analogs. These analogs help to sequester fluidic amorphous calcium phosphate nanoprecursors and function as templates for guiding homogeneous apatite nucleation within the collagen fibrils. By adopting this scheme for remineralizing adhesive resin-bonded, completely demineralized dentin, we have been able to redeposit ...
The origin of the FOM conference series were the three-dimensional imaging capabilities of confocal microscopes together with the associated 3D image processing methodologies that developed in the mid 80s. The technology for optical microscopy has been evolved rapidly with the development of opto electronic technologies such as femtosecond lasers and highly sensitive photo-detectors, together with a wide variety of new fluorescent staining methodologies and digital image analysis routines for 3D and live cell 4D data sets. Nonlinear optical microscopy including multi-photon excited fluorescence microscopy, time-resolved micro-spectroscopy, and second-harmonic and coherent anti-Stokes Raman are making imaging of molecular compositions possible. High-resolution optical microscopy, including near-field scanning optical microscopy, four-pi confocal microscopy, and coherence probe microscopy also constitute a major research topic that progresses optical microscopy towards nanoscopy. These timely ...
Optical techniques can access a wealth of information but traditionally their resolution has been restricted by the diffraction limit. Near-field techniques, which used nanoscale apertures or nanotip electric field enhancement, have succeeded in circumventing Abbes law. We show that atomic resolution is theoretically achievable for tip enhanced optical microscopy. Using finite element analysis of the electromagnetic field around a small radius metallic scanning probe microscopy tip, we modelled various tip radii and materials, and an aqueous environment as well as ambient air. For a 1 nm gold tip we predict a strong red shift, and surprisingly high values for the enhancement of the intensity of scattered light - over 107. For this tip, we predict that 0.2 nm lateral resolution in optical imaging is achievable - good enough to resolve individual atomic bonds. The promise of optical data at these spatial scales offers great potential for nanometrology and nanotechnology applications.. ©2006 ...
SPM/AFM (scanning probe microscopy/atomic force microscopy) offers many unique advantages to the study of biological process at the nanometer scale. ASM/AFM allows scientists to visualize, probe, and analyze the structure of biological molecules in their native environments with unprecedented resolution and without the need for rigorous sample preparation. Nanoscale binding events are known to be the primary events in a variety of biological phenomenon, from DNA replication and RNA transcription, to immune response, tissue growth, cellular differentiation, and the action of drugs, hormones, and toxic substances, to name just a few. SPM/AFM is also unique in its ability to detect nanoscale molecular forces such as those that occur on an SPM/AFM tip as it approaches and then retracts from a surface. This property has exposed the possibility of measuring inter- and intra-molecular forces at the single molecule level. Fast structural and recognition results are useful in recognition studies of biological
The overarching goal of this research is to surpass the existing analytical capability for nanometer scale spatially resolved material characterization at interfaces under ambient conditions. This is being accomplished through a distinctive merger of advanced spectroscopic and ultrafast time-resolved imaging, scanning probe microscopy, and mass spectrometry. There are two synergistic subtasks in this proposal. In Subtask 1, research is focused on enabling and advancing the ability of ambient surface sampling/ionization mass spectrometry, in combination with other imaging modalities, to study and characterize with submicrometer spatial resolution (100- 1000 nm) molecular and elemental constituents of material interfaces under real world conditions. In Subtask 2, research is focused on utilizing optical spectroscopic methods with high spatial and temporal resolution to provide an understanding of the ultrafast energy flow and chemical reactions in nanostructures and selected functional ...
N.M. Toan, C. Zhang, M. Shimaoka, S.B. Smith, D. Thirumalai and J. Seog "Mechanical Hierarchy in a Single α I Domain in Integrin Reveals a Functional Role for Allosteric Signaling", to be submitted. A. Lee, A. Karcz, R. Akman, S. Kwon, S. Chou, L.J. Tricoli, J.M. Hustedt, J.D. Kahn, A.J. Mixson, J. Seog, "Direct Observation of Dynamic Mechanical Regulations of Condensed DNA by Environmental Stimuli", to be submitted. H. Chang, C. Hsu, M. Ahmed, J. Seog, G. Oehrlein, and D. Graves, "Plasma Flux Dependent Lipid A Deactivation", submitted. E. Bartis2, B. Caleb, T. Chung, N. Ning, J. Chu, D. Graves, J. Seog, G. Oehrlein, "Deactivation of Lipopolysaccharide by Ar and H2 Inductively-coupled Low Pressure Plasma", accepted in Journal of Physics D: Applied Physics. N. Weadock, N. Varonchayakul1, J. Seog, and L. Hu, "Determination of Mechanical Properties of the SEI in Sodium Ion Batteries vis Colloidal Probe Microscopy", Nano Energy, 2013, 2(5), 713-719. S. Chou, K. Hom, D. Zhang, Q. Leng, L.J. Tricoli, ...
Advanced Scanning Probe Microscopy techniques combine Atomic Force Microscopy (AFM) with ultrasound. Atomic Force Acoustic Microscopy (AFAM) and Ultrasonic Force Microscopy (UFM) become increasingly powerful tools for the determination of material properties on nanoscale. AFAM is mainly applied to the analysis of materials with elastic properties locally varying on micro- and nanoscale. Deformation fields and buried structures can be visualized. In AFAM, flexural and torsional cantilever vibrations are excited by out-of-plane and in-plane sample surface vibrations. The ultrasound is transmitted from the sample into the cantilever while forces act between sensor tip and sample. The sample surface is scanned by the sensor, and an ultrasonic image is acquired simultaneously to the topography image. The contrast comprehended in the ultrasonic image depends on surface topography and on the local elastic and adhesive properties of the sample. Voids, inclusions, or cracks, which build up regions of ...
Increasing government and corporate funding in life sciences and nanotechnology is predominantly driving the microscopy market. Furthermore, technological advances that enhance ease of usage, automation, better quality imaging, faster/better analysis have also had a huge positive impact on the market. Quantum dots technology in microscopy is a growing area of interest and is expected to drive the future growth of microscopy market. World microscopy market is expected to grow from $2.7 billion in 2010 to $4.5 billion in 2015, at an estimated CAGR of 10.8% from 2010 to 2015. The optical microcopy segment currently dominates the microscopy market. However, it is expected to lose market share to advanced microscopies such as electron and scanning probe. Scanning probe microscopy is the fastest growing market with a CAGR of 18.1 ...
The group of Dr. Irene Groot investigates the structure-activity relationship of catalysts under industrial conditions using operando scanning probe microscopy, transmission electron microscopy, surface X-ray diffraction, and optical microscopy. She focuses on industrial processes related to sustainable energy and materials production. The nanoscale structure of a catalyst under reaction conditions determines its activity, selectivity, and stability. For the production of sustainable energy and materials, new catalysts are needed. By understanding the structure-activity relationships of catalysts under reaction conditions, insight in the development of these new catalysts can be obtained. Using in situ imaging techniques under industrial conditions, we are currently studying Fischer-Tropsch synthesis, NO reduction and oxidation, hydrodesulfurization, and chlorine production. ...
Fluidic force microscopy (FluidFM) is a type of scanning probe microscopy, and is typically used on a standard inverted light microscope. The unique characteristic of FluidFM is that it introduces microscopic channels into AFM probes. Those channels can have an aperture of less than 300 nm, or 500 times thinner than a human hair. This nanometric features enables the handling of liquid volumes at the femtoliter (fL) scale as well as force controlled manipulations of sub-micron objects. Via the nanofluidic channels, substances can for example be inserted into single cells or cells can be isolated from a confluent layer. Special micropipettes and nanopipettes are used as FluidFM probes with openings between 300 nm and 8 μm. A larger diameter is helpful for single cell adhesion experiments, whereas a smaller diameter provides good opportunities for nanolithography and handling of sub-micron objects. Compared to the traditional glass micropipettes FluidFM probes are much more gentle to soft samples ...
In order to observe the charge transport within the solar cell, the Mainz researchers have split the cell in two halves. They then polished the cross section with a finely focused ion beam. With the fine tip of a scanning force microscope, they were able to image the structure of the layer down to a resolution of a few nanometers. In addition, Kelvin probe microscopy was contemporaneously used to measure the local electrical potential underneath the tip. From the potential distribution, the researchers were then able to derive the field distribution and thus the charge transport occurring through the various layers of the cell.. In several measurement series, the researchers found that a strong accumulation of positive charges takes place in the perovskite layer upon exposure to light. They suppose that titanium dioxide, the electron conductor, does its job much more efficiently than the hole conductor. In other words, the holes do not reach their electrode as fast as the electrons do; they ...
Project:. One of the central themes in Nanoscience is Molecular Electronics which aims to reach the next level of miniaturization of electronic components. This project focuses on the requirements needed to translate single-molecule electronics from a fundamental tool to a practical technology. Using scanning probe microscopy approaches (mainly scanning tunneling microscopy and atomic force microscopy) combined with surface chemistry and electrochemical techniques this project aim to enhance the physical and chemical properties of the contact between single molecules and electrodes. A key approach is the use of new electrode-molecule anchoring strategies including the integration of single-molecule junctions with the industrially dominant silicon electronics and the utilizations of chemistries whose electronic properties lead to a device-performance beyond conventional electronics.. Applicants ...
Insight into the quantum world requires access to individual spins and the ability to manipulate their interactions with their environment. With the development of scanning probe microscopy, it has become possible to access the spin of an individual atom with unprecedented resolution. I will review exciting developments based on scanning tunneling microscopy and atomic force microscopy (STM/AFM) which enables magnetic imaging at the single atom level. Using iron atoms as an example, I will discuss how we can characterize the magnetic properties of an individual atom, such as its.... ...
Midori MURAKAMI (Lecturer). Proteins are inherently dynamic molecules that undergo structural changes and interactions with other molecules over a wide timescale range, from nanoseconds to milliseconds or longer. Furthermore, protein motions play an important biological role in the assembly into protein complexes, ligand binding and enzymatic reactions. Therefore, understanding the dynamic behaviour of a protein is a requisite for gaining insight into their function mechanisms. We develop novel methods for directly observing proteins dynamics based on high-speed atomic force microscopy (AFM), which is one of scanning probe microscopy, and exploit new paradigm of dynamic structural biology. Also we analyze structural dynamics of rhodopsin at atomic resolution using X-ray crystallographic technics for understanding the molecular mechanism and creating new functional GPCRs.. ...
The bi-annual conference series Microscopy of Semiconducting Materials has a long tradition in focusing on the most recent advances in the study of the structural and electronic properties of semiconducting materials by the application of transmission and scanning electron microscopy. The latest developments in the use of other important micro-characterisation techniques including scanning probe microscopy and X-ray topography and diffraction will also be featured.. ...
Bottomleys research interests are in electroanalytical chemistry, scanning probe microscopy, and surface enhanced Raman scattering. Current research is focused on:. Theory and Application of Cyclic Square Wave Voltammetry.. The objective of this research endeavor is to develop Cyclic Square Wave Voltammetry (CSWV) as a mechanistic tool for the identification of electrode reactions. To achieve this objective, we are developing diagnostic criteria specific for a wide range of mechanisms involving reversible, kinetically-controlled, and/or chemically-coupled reactions for diffusible as well as surface-confined redox active species. For each mechanism, a reaction is written for the electron transfer step and the conditions under which it occurs. Appropriate boundary conditions for this system are applied. The resultant partial differential equations are solved for the CSWV waveform. The solutions are a set of equations describing concentrations of the reactants and products as a function of time. ...
WITec GmbH - Company Profile. WITec is a manufacturer of high resolution optical and scanning probe microscopy solutions for scientific and industrial applications. A modular product line allows the
The MV4000 multiprobe scanned probe microscopy systems manufactured by !%Nanonics Imaging Ltd.%! independently scan four probes with ultralow noise in
Products Index. Nov. 01, 2005Products Scanning Probe Microscopy Leica: AF6000 LX Leica: AF6000 LX. The new Leica AF6000 LX is a highly integrated system for advanced widefield fluorescence imaging
TOPOLOGICAL PROCESS DYNAMICS and Applications to Biosystems {Basic outline material for a seminar(series) on the theme of topological process dynamics in quantum physics and with extensions and applications in biophysics and structural biology) M. Dudziak January 30, 1998 MJD 1 08-03-16 2:33 PM Outline of the Seminar 1. Introduction 2. Overview of Topological Dynamics - Quantum, Geometry, and Biosystem 3. P-Adic Numbers and Length Scales 4. The "CHAOITON" Project with JINR and Topologically Stable Solitons 5. A Critical Hypothesis for Biosystems and the Brain 6. Experimental Foundations and Earlier Scanning Probe Microscopy Studies 7. QNET and CLANS - Early Computational Simulations 8. A New Experimental Approach Based Upon Magneto-Optic Sensors and Controllers 9. Recapitulation and Conclusions (1a) MJD 2 08-03-16 2:33 PM 1. INTRODUCTION Motivating Questions and Issues  Is there a problem with our fundamental view of space and time?  Consider EPR and non-locality and the Quantum Potential ...
Invited Talks 29. Nanosessions 69. Nanosession: 2D electron systems - Atomic configurations 71. Nanosession: 2D electron systems - Correlation effects and transport 81. Nanosession: 2D electron systems - Electronic structure and field effects 89. Nanosession: Calorics 99. Nanosession: Topological effects 109. Nanosession: Mott insulators and transitions 115. Nanosession: Advanced spectroscopy and scattering 123. Nanosession: High-resolution transmission electron microscopy 133. Nanosession: New technologies for scanning probes 143. Nanosession: Phase change materials 155. Nanosession: Phase change memories 163. Nanosession: Scanning probe microscopy on oxides 177. Nanosession: Logic devices and circuit design 185. Nanosession: Neuromorphic concepts 197. Nanosession: Electrochemical metallization memories 207. Nanosession: Valence Change Memories - redox mechanism and modelling 219. Nanosession: Valence Change Memories - a look inside 233. Nanosession: Variants of resistive switching ...
Andrea Liscio is a Researcher at Nanochemistry Labs at the Italian National Research Council (CNR-ISOF) in Bologna. He received his B.S. degree in Physics from Roma TRE University (2000) and a Ph.D. in Physics (2004) where he studied the electronic properties of surfaces and interfaces with coincidence electronic spectroscopies. After Ph.D he moved to CNR-ISOF where he mainly focused on the study of supra-molecular assembles using Scanning Probe Microscopies (SPMs). In the period within 2011-2013 he worked as Project Manager of the European project "GENIUS - ITN (graphene-organic hybrid architectures for organic electronics: a multisite training", responsible for the management of 19 PhD students and 3 post-Doc, as well as the scientific management, and financial-administrative reporting. Author of about 55 research articles in high-level, international, peer-reviewed journals and reviews, he is currently in charge of CNR -ISOF for SPM within the European Project "FLAGSHIP GRAPHENE - ...
In the present work, shifting of Fermi level of MoS{sub 2} nanosheets due to decoration of Au nanoparticles (Au NPs) is reported. Au NPs are grown on MoS{sub 2} nanosheets by chemical reduction method. The structural analysis of pristine MoS{sub 2} and Au NPs decorated MoS{sub 2} has been done using X-ray diffraction and transmission electron microscopy. The effect of Au NPs decoration on the Fermi energy level of MoS{sub 2} nanosheets have been monitored by scanning Kelvin probe microscopy, which measures the work function in terms of contact potential difference. The work function of pristine MoS{sub 2} is found to be 4.994 eV, and it increases linearly for Au-MoS{sub 2} with increasing concentration of Au NPs. The gradual increase in the work function values indicate a systematic shifting of Fermi energy level of MoS{sub 2} towards valence band due to decoration of Au NPs. ...
The first argument in ref. 1 deals with what we believe is a nontrivial problem. Imaging curved surfaces in scanning probe microscopy is complex, as arguably the microscopes have been engineered to image mostly-flat samples. Figure 1 in ref. 1 does not capture the reality of STM image acquisition, as it suggests (without showing it) that the tip follows a horizontal, sample-independent trajectory onto which sample-derived features (tunneling currents) are projected. Hence, the central argument in Lévys paper is based on two assumptions: (1) an STM tip moves horizontally on a sample, and (2) tunneling currents flow perfectly vertically from the tip into the substrate holding the sample. Both assumptions are invalid. In reality, the tip follows the contour of the sample.23 The correct projection of the sample features being imaged with STM is onto the true tip trajectory, not onto an imaginary flat line. If we assume a tip trajectory that maintains a constant distance from the particles center ...
In certain embodiments of the invention, a plurality of images of one or more subjects may be captured using different imaging techniques, such as different modalities of scanning probe microscopy. Parameters may be estimated from the plurality of images, using one or more models of known molecular structures to provide a model-based analysis. The estimated parameters may be fused, with further input from physical models of known molecular structures. The fused parameters may be used to characterize the subjects. Such characterization may include the detection and/or identification of specific molecular structures, such as proteins, peptides and/or nucleic acids of known sequence and/or structure. In some embodiments of the invention the structural characterizations may be used to identify previously unknown properties of a subject molecule.
1. Hybrid Organic Inorganic Perovskites (HOIPs): Our vision is to design new HOIPs with improved stability and superior device performance for energy harvesting, and electronic applications. We aim to understand and exploit the mixed ion-electronic conduction properties of HOIPs for various applications. We are currently working to to elucidate the mechanism for ion transport in metal halide perovskites containing organic cations. We evaluate kinetics of ion transport in operando in a set of specifically-designed compounds in functional devices, and pristine thin films and single crystals using imepdance spectroscopy. We also use x-ray diffraction, Kelvin probe microscopy and other techniques to probe ion transport in these solids.. 2. Organic Nanoparticles and Their Assemblies: Our vision is a supramolecular method that enables the fabrication of functional materials with hierarchical structural features through modular assembly wherein the modular components are encoded with sufficient ...