Bibliographies thématiques / Single molecule conductance measurements

Littérature scientifique sur le sujet « Single molecule conductance measurements »

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Publié le 11 mars 2023

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Articles de revues sur le sujet "Single molecule conductance measurements"

Hong, Wenjing, Hennie Valkenier, Gábor Mészáros, David Zsolt Manrique, Artem Mishchenko, Alexander Putz, Pavel Moreno García, Colin J. Lambert, Jan C. Hummelen et Thomas Wandlowski. « An MCBJ case study : The influence of π-conjugation on the single-molecule conductance at a solid/liquid interface ». Beilstein Journal of Nanotechnology 2 (18 octobre 2011) : 699–713. http://dx.doi.org/10.3762/bjnano.2.76.

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π-Conjugation plays an important role in charge transport through single molecular junctions. We describe in this paper the construction of a mechanically controlled break-junction setup (MCBJ) equipped with a highly sensitive log I–V converter in order to measure ultralow conductances of molecular rods trapped between two gold leads. The current resolution of the setup reaches down to 10 fA. We report single-molecule conductance measurements of an anthracene-based linearly conjugated molecule (AC), of an anthraquinone-based cross-conjugated molecule (AQ), and of a dihydroanthracene-based molecule (AH) with a broken conjugation. The quantitative analysis of complementary current–distance and current–voltage measurements revealed details of the influence of π-conjugation on the single-molecule conductance.

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Alangari, Mashari, Busra Demir, Caglanaz Akin Gultakti, Ersin Emre Oren et Joshua Hihath. « Mapping DNA Conformations Using Single-Molecule Conductance Measurements ». Biomolecules 13, n^o 1 (8 janvier 2023) : 129. http://dx.doi.org/10.3390/biom13010129.

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DNA is an attractive material for a range of applications in nanoscience and nanotechnology, and it has recently been demonstrated that the electronic properties of DNA are uniquely sensitive to its sequence and structure, opening new opportunities for the development of electronic DNA biosensors. In this report, we examine the origin of multiple conductance peaks that can occur during single-molecule break-junction (SMBJ)-based conductance measurements on DNA. We demonstrate that these peaks originate from the presence of multiple DNA conformations within the solutions, in particular, double-stranded B-form DNA (dsDNA) and G-quadruplex structures. Using a combination of circular dichroism (CD) spectroscopy, computational approaches, sequence and environmental controls, and single-molecule conductance measurements, we disentangle the conductance information and demonstrate that specific conductance values come from specific conformations of the DNA and that the occurrence of these peaks can be controlled by controlling the local environment. In addition, we demonstrate that conductance measurements are uniquely sensitive to identifying these conformations in solutions and that multiple configurations can be detected in solutions over an extremely large concentration range, opening new possibilities for examining low-probability DNA conformations in solutions.

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García, Raúl, M. Ángeles Herranz, Edmund Leary, M. Teresa González, Gabino Rubio Bollinger, Marius Bürkle, Linda A. Zotti et al. « Single-molecule conductance of a chemically modified, π-extended tetrathiafulvalene and its charge-transfer complex with F4TCNQ ». Beilstein Journal of Organic Chemistry 11 (24 juin 2015) : 1068–78. http://dx.doi.org/10.3762/bjoc.11.120.

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We describe the synthesis and single-molecule electrical transport properties of a molecular wire containing a π-extended tetrathiafulvalene (exTTF) group and its charge-transfer complex with F4TCNQ. We form single-molecule junctions using the in situ break junction technique using a homebuilt scanning tunneling microscope with a range of conductance between 10 G0 down to 10−7 G0. Within this range we do not observe a clear conductance signature of the neutral parent molecule, suggesting either that its conductance is too low or that it does not form a stable junction. Conversely, we do find a clear conductance signature in the experiments carried out on the charge-transfer complex. Due to the fact we expected this species to have a higher conductance than the neutral molecule, we believe this supports the idea that the conductance of the neutral molecule is very low, below our measurement sensitivity. This idea is further supported by theoretical calculations. To the best of our knowledge, these are the first reported single-molecule conductance measurements on a molecular charge-transfer species.

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Kim, Taekyeong, et Tae Hyun Kim. « Measuring Conductance of Phenylenediamine as a Molecular Sensor ». Journal of Sensors 2015 (2015) : 1–6. http://dx.doi.org/10.1155/2015/353095.

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We report experimental measurements of molecular conductance as a single molecular sensor by using scanning tunneling microscope-based break-junction (STM-BJ) technique. The gap was created after Au atomic point contact was ruptured, and the target molecule was inserted and bonded to the top and bottom electrodes. We successfully measured the conductance for a series of amine-terminated oligophenyl molecules by forming the molecular junctions with Au electrodes. The measured conductance decays exponentially with molecular backbone length, enabling us to detect the type of molecules as a molecular sensor. Furthermore, we demonstrated reversible binary switching in a molecular junction by mechanical control of the gap between the electrodes. Since our method allows us to measure the conductance of a single molecule in ambient conditions, it should open up various practical molecular sensing applications.

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Kaliginedi, Veerabhadrarao, Alexander V. Rudnev, Pavel Moreno-García, Masoud Baghernejad, Cancan Huang, Wenjing Hong et Thomas Wandlowski. « Promising anchoring groups for single-molecule conductance measurements ». Phys. Chem. Chem. Phys. 16, n^o 43 (2014) : 23529–39. http://dx.doi.org/10.1039/c4cp03605k.

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Pal, Atindra Nath, Tal Klein, Ayelet Vilan et Oren Tal. « Electronic conduction during the formation stages of a single-molecule junction ». Beilstein Journal of Nanotechnology 9 (17 mai 2018) : 1471–77. http://dx.doi.org/10.3762/bjnano.9.138.

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Single-molecule junctions are versatile test beds for electronic transport at the atomic scale. However, not much is known about the early formation steps of such junctions. Here, we study the electronic transport properties of premature junction configurations before the realization of a single-molecule bridge based on vanadocene molecules and silver electrodes. With the aid of conductance measurements, inelastic electron spectroscopy and shot noise analysis, we identify the formation of a single-molecule junction in parallel to a single-atom junction and examine the interplay between these two conductance pathways. Furthermore, the role of this structure in the formation of single-molecule junctions is studied. Our findings reveal the conductance and structural properties of premature molecular junction configurations and uncover the different scenarios in which a single-molecule junction is formed. Future control over such processes may pave the way for directed formation of preferred junction structures.

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Chen, Fang, Joshua Hihath, Zhifeng Huang, Xiulan Li et N. J. Tao. « Measurement of Single-Molecule Conductance ». Annual Review of Physical Chemistry 58, n^o 1 (mai 2007) : 535–64. http://dx.doi.org/10.1146/annurev.physchem.58.032806.104523.

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Kaneko, S., D. Murai, Sh Fujii et M. Kiguchi. « Surface enhanced Raman scattering of single 1,4-Benzenedithiol molecular junction ». International Journal of Modern Physics B 30, n^o 13 (19 mai 2016) : 1642010. http://dx.doi.org/10.1142/s0217979216420108.

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Here, we present simultaneous electronic and optical measurements of a single 1,4-benzenedithiol (BDT) molecular junctions to investigate the electronic and structural details in the molecular junction and to understand the charge transport property at the single molecular scale. The electronic property was investigated by DC conductance measurement while structural property was characterized using surface enhanced Raman scattering (SERS) measurement. The single BDT junctions sandwiched between Au nanogap-electrodes were prepared by the mechanically controllable break junction method at ambient conditions. The simultaneous conductance and SERS measurements demonstrate that ring deformation mode coupled to C–S stretching mode, ring breathing mode, and C=C stretching mode are detectable for the single BDT molecular junctions with electronic conductance of [Formula: see text] [Formula: see text]. The single molecule origin is supported by the characteristic variability of SERS within samples. Time evolution of the conductance and SERS signals indicated that the molecular conductance and the vibrational energy of the ring breathing mode exhibits anti-correlated relationship. This relationship can be mediated by time evolution of structural change in the single molecular junction and corresponding change in strength of metal–molecular coupling. The larger metal–molecular coupling causes higher electronic conductance of the molecular junction while charge transfer effect leads to weakening of molecular bonds and thus a resulting decrease in the vibration energy of the ring breathing mode.

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Mejía, Leopoldo, et Ignacio Franco. « Force–conductance spectroscopy of a single-molecule reaction ». Chemical Science 10, n^o 11 (2019) : 3249–56. http://dx.doi.org/10.1039/c8sc04830d.

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We demonstrate how simultaneous measurements of conductance and force can be used to monitor the step-by-step progress of a mechanically activated cis-to-trans isomerization single-molecule reaction, including events that cannot be distinguished using force or conductance alone.

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Luka-Guth, Katharina, Sebastian Hambsch, Andreas Bloch, Philipp Ehrenreich, Bernd Michael Briechle, Filip Kilibarda, Torsten Sendler et al. « Role of solvents in the electronic transport properties of single-molecule junctions ». Beilstein Journal of Nanotechnology 7 (22 juillet 2016) : 1055–67. http://dx.doi.org/10.3762/bjnano.7.99.

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We report on an experimental study of the charge transport through tunnel gaps formed by adjustable gold electrodes immersed into different solvents that are commonly used in the field of molecular electronics (ethanol, toluene, mesitylene, 1,2,4-trichlorobenzene, isopropanol, toluene/tetrahydrofuran mixtures) for the study of single-molecule contacts of functional molecules. We present measurements of the conductance as a function of gap width, conductance histograms as well as current–voltage characteristics of narrow gaps and discuss them in terms of the Simmons model, which is the standard model for describing transport via tunnel barriers, and the resonant single-level model, often applied to single-molecule junctions. One of our conclusions is that stable junctions may form from solvents as well and that both conductance–distance traces and current–voltage characteristics have to be studied to distinguish between contacts of solvent molecules and of molecules under study.

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Thèses sur le sujet "Single molecule conductance measurements"

Brooke, Carly. « Synthesis, characterisation and single molecule conductance measurements of organic molecules ». Thesis, University of Liverpool, 2012. http://livrepository.liverpool.ac.uk/9397/.

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The use of single molecules to construct electronic devices is an exciting prospect, and one that has long provided a driving force for research in the area of molecular scale electronics. In order for this emerging field to advance a deep understanding of the fundamental mechanisms that govern electron conduction at the molecular level is imperative. Recent developments in areas such as scanning tunnelling microscopy, have facilitated the determination of the electrical properties of single molecules tethered between two metallic contacts. The analysis and potentially tailoring of structure-property relationships is hugely important and could lead to new and unforeseen applications for this emerging field. The work presented herein details two major studies. The first is an investigation of the transport properties of a series of analogous molecules, which consist of a single benzene ring sandwiched between two alkyl chains of varying length. Prior to the work in this thesis one such molecule, and various substituted analogues thereof, had shown behaviour similar to what would be expected of a molecular equivalent of a double tunnelling barrier. The data presented here demonstrates a remarkably low dependence of this system on molecular length; this result contradicts the behaviour expected of a coherent transport mechanism. Moreover, the study of the orbital energies and densities of these molecules provides further evidence of a mechanism of conduction that is very different to that previously suggested for this system. The second study centres around the investigation of the conductance behaviour of 4,4’-bipyridine and some substituted analogues thereof; this study is presented in two parts. The first details attempts to synthesise planar analogues of 4,4’-bipyridine, as well the synthesis and reactivity of novel substituted bipyridines. The second part reports conductance data, electrochemical studies and theoretical calculations of properties of these molecules. The data presented provides new information regarding the relationship between electronic structure and conductance behaviour in this type of system.

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Psychogyiopoulou, Krystallia. « Synthesis, surface spectroscopy and single molecule conductance measurements of some metalloporphyrins ». Thesis, University of Liverpool, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.422991.

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Lanzilotto, Valeria. « Self-assembling and charge transfer properties of thin organic films ». Doctoral thesis, Università degli studi di Trieste, 2012. http://hdl.handle.net/10077/7362.

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2010/2011
In the present thesis I dealt the issue of molecular ordering and charge transfer at two types of organic-inorganic interfaces that are representative of the basic constituents of an organic electron device. I investigated i.) the influence of a selected dielectric surface on the ordering of an overlayer of several organic molecules and ii.) the electronic transport properties of a single molecular junction with a metal electrode. Both systems have been characterized by a structural and electronic point of view. Among the techniques available for structural investigation, I made extensive use of Helium Atom Scattering (HAS) and Scanning Tunneling Microscopy (STM). The electronic properties, with particular emphasis to the charge transfer, have been addressed by two methods chosen according to the dimensionality of the system under consideration. For the charge transfer at laterally extended interfaces I used synchrotron based techniques, like Resonant Photoemssion Spectroscopy (RPES), while for the charge transport through a single molecule I used and developed the STM-based break junction technique (STM-BJ). For the first type of interface, I focused on the coupling between the TiO2(110)-1x1 surface and different organic semiconductor molecules: C60, pentacene, perylene-tetracarboxilic-acid-diimide (PTCDI) and perylene. The strong anisotropy of the substrate has been found to drive the adsorption geometry of the molecules leading to the formation of ordered phases (at least for the first layer). In particular pentacene, PTCDI and perylene (polycyclic aromatic hydrocarbons, PAHs) display a common self-assembly mechanism, where the molecules lay on the surface with their long axis oriented parallel to the [001] substrate direction. In the transverse direction [1-10] these molecules are observed to match the substrate periodicity by tilting the molecular plane around the long axis by an angle that depends on the molecular width. Nevertheless the molecule-to-substrate interaction is very weak as indicated by the molecular electronic structure, which is observed by X-ray spectroscopy to remain mostly unperturbed in the first molecular layer. Only PTCDI bears a major interaction with the TiO2(110)-1x1 surface, but confined to the molecular orbitals closest to the gap. The main experimental evidence of this interaction is the appearance of a new molecular filled state in the valence band region close to the Fermi level. By a combined RPES and NEXAFS study we have found that this new electronic state is due to the charge transfer occurring from the substrate Ti defect state (i.e. the excess of electrons associated with oxygen vacancies) to the lowest unoccupied molecular orbital (LUMO). For the second type of hybrid interface, instead, I exploited the nitrogen-link chemistry in order to bridge a phthalocyanine to two gold electrodes and to measure its conductance. In particular, by using the Tetraaza-Cu-Phthalocyanine I investigated the pyridine-gold bond that is relatively weak and insensitive to the local structure, a fundamental requirement for the establishment of well defined and stable transport properties. The weak interaction between the molecule and a representative metal electrode, namely the Au(100) surface, has been confirmed by spectroscopic and STM experiments. At RT the molecules have been found to diffuse on the surface and only at LT (55 K) they can be observed to self-organize into large molecular domains. On these domains, reliable and reproducible single molecule conductance measurements have been performed by using the STM-based break junction method. The conductance value obtained for the Tetraaza-Cu-Phthalocyanine (7x10-4 G0) has been rationalized in terms of the molecular length and degree of conjugation, as well as by correlation to the energy level alignment at the junction.
XXIV Ciclo
1984

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Leary, Edmund. « Single Molecule Conductance of Dithiahexyl-Aryl Compounds ». Thesis, University of Liverpool, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.507724.

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Zhao, Xiaotao. « The synthesis and single-molecule conductance of conjugated molecular wires ». Thesis, Durham University, 2014. http://etheses.dur.ac.uk/10634/.

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The past decades have seen the fast development of electronic devices in the industrial sector. There is increasingly rapid growth in the demand for alternative electronic building blocks to compliment, and possibly replace, the conventional silicon-based products. Electronic devices based on organic molecules, especially those based on single molecules, receive intense studies both theoretically and experimentally. In this presented work, a new family of oligo(aryleneethenylene)s (OAE)s with molecular lengths (N…N distance) of ca. 2-6 nm were designed to investigate the length dependence of conductance at the single molecule level. X-ray molecular structures of OAEs with a molecular length up to 5.3 nm were successfully analysed and presented. Secondly, four groups of pyridyl terminated oligo(phenyleneethylene) (OPE) derivatives were studied for the quantum interference effects. A dramatic destructive quantum interference effect was observed which decreased the single molecule conductance by several orders of magnitude. Unsymmetrical molecules with only one anchor group were noticed to form π-π stacking between two molecules. Thirdly, amino terminated OPEs bearing various substituents on the central phenyl rings were explored to present the robustness of the central OPE backbone towards various functionalising substituents. Fourthly, diaryloligoynes with different anchor groups were synthesised and the single-molecule conductances were studied. The stability of the tetrayne compounds is discussed and X-ray crystal structures of the stable tetraynes are presented. Finally, pyridyl terminated OAE derivatives bearing an anthraquinone core were synthesised to investigate the charge transport through the central anthraquinone core, with special purpose of investigating quantum interference effects and the switching process of the central anthraquinone core.

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Pearson, Anita P. « AFM investigation of single molecule force measurements ». Thesis, University of Nottingham, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441016.

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Radiom, Milad. « Correlation Force Spectroscopy for Single Molecule Measurements ». Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/49677.

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This thesis addresses development of a new force spectroscopy tool, correlation force spectroscopy (CFS), for the measurement of the mechanical properties of very small volumes of material (molecular to µm³) at kHz-MHz time-scales. CFS is based on atomic force microscopy (AFM) and the principles of CFS resemble those of dual-trap optical tweezers. CFS consists of two closely-spaced micro-cantilevers that undergo thermal fluctuations. Measurement of the correlation in thermal fluctuations of the two cantilevers can be used to determine the mechanical properties of the soft matter, e.g. a polymeric molecule, that connects the gap between the two cantilevers. Modeling of the correlations yields the effective stiffness and damping of the molecule. The resolution in stiffness is limited by the stiffness of the cantilever and the frequency by the natural frequency of the cantilevers, but, importantly, the damping resolution is not limited by the damping of the cantilever, which has enabled high-resolution measurements of the internal friction of a polymer. The concept of CFS was originally presented by Roukes' group in Caltech [Arlett et al., Lecture Notes in Physics, 2007]; I developed the first practical versions of CFS for experimentation, and have used it in two applications (1) microrheology of Newtonian fluids and (2) single molecule force spectroscopy. To understand the correlation in thermal fluctuations of two cantilevers I initially validated the theoretical approach for analyzing correlation in terms of deterministic model using the fluctuation-dissipation theorem [Paul and Cross, PRL, 2004]. I have shown that the main advantages of such correlation measurements are a large improvement in the ability to resolve stiffness and damping. Use of CFS as a rheometer was validated by comparison between experimental data and finite element modeling of the deterministic vibrations of the cantilevers using the known viscosity and density of fluids. Work in this thesis shows that the data can also be accurately fitted using a simple harmonic oscillator model, which can be used for rapid rheometric measurements, after calibration. The mechanical properties of biomolecules such as dextran and single stranded DNA (ssDNA) are also described. CFS measurements of single molecule properties of ssDNA reveal the internal friction of the molecule in solution.
Ph. D.

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Berthoumieu, Olivia. « Single molecule studies of seven transmembrane domain proteins ». Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:ff7ae71d-5481-4523-812b-2128fe32f5fc.

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This work aimed at studying biophysical properties of two membrane proteins, one of potential nanotechnological use, bacteriorhodopsin, and one potential drug target, the NTS1 neurotensin receptor, at the single molecule scale. Bacteriorhodopsin (BR) is the only protein in the purple membrane (PM) of the halophilic organism Halobacterium salinarium. It is a light-driven proton pump converting light into a transmembrane proton gradient through isomerization of its retinal chromophore. Its stability, as well as its photoactivity remaining in dry protein layers, has made BR an attractive material for biomolecular devices. Numerous studies have been published on this topic; however, they have all used BR within the PM, on relatively large (µm-wide) surfaces. Here, conducting-probe atomic force microscopy (C-AFM) analysis was performed after removing most of the membrane lipids. For the first time, it was shown that the molecular conductance of BR can be reversibly photoswitched with predictable wavelength sensitivity. Intimate and robust coupling to gold electrodes was achieved by using a strategically engineered cysteine which, combined with partial delipidation, generated protein trimers homogenously orientated on the surface. Numerous controls using biophysical (SPR, ellipsometry, Kelvin-probe AFM) and chemical (photocurrent, cyclic voltammetry) techniques confirmed the wavelength specificity of the photoswitch, the anchoring role of the mutation and the homogenous orientation of the protein on the gold surface. Neurotensin is a brain and gastrointestinal 13 amino acid peptide acting as a neuromodulator in the central nervous system and as a hormone in the periphery. Its wide range of biological activities is primarily mediated through its binding to the neurotensin type 1 receptor (NTS1). NTS1 expressed in E.coli was purified and inserted into 100 nm brain polar lipid liposomes in a conformation which retained its ligand-binding capabilities. Initial AFM characterisation was performed as a prelude for ligand-receptor interaction studies, including high resolution imaging, force spectroscopy and solid state NMR approaches.

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Holden, Seamus J. « Improved methods for sub-diffraction-limit single-molecule fluorescence measurements ». Thesis, University of Oxford, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.543548.

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Portoles, Jose Fernando. « The development of MEMS devices for traceable single-molecule force measurements ». Thesis, University of Nottingham, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.493321.

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Livres sur le sujet "Single molecule conductance measurements"

Dell, Emma Jane. Single Molecule Conductance of Oligothiophene Derivatives. [New York, N.Y.?] : [publisher not identified], 2015.

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Force and Conductance Spectroscopy of Single Molecule Junctions. [New York, N.Y.?] : [publisher not identified], 2012.

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Radiom, Milad. Correlation Force Spectroscopy for Single Molecule Measurements. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-14048-3.

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Chen-hua, Chang, McCollom Alex D et United States. National Aeronautics and Space Administration., dir. On the uncertainty in single molecule fluorescent lifetime and energy emission measurements : Technical report 94-03. [Washington, D.C.] : National Aeronautics and Space Administration, 1994.

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Correlation Force Spectroscopy for Single Molecule Measurements. Springer, 2015.

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Radiom, Milad. Correlation Force Spectroscopy for Single Molecule Measurements. Springer, 2015.

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Radiom, Milad. Correlation Force Spectroscopy for Single Molecule Measurements. Springer, 2016.

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Orrit, Michel. Single-molecule spectroscopy. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198768609.003.0006.

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This chapter gives an overview of the main optical methods used to detect and study single molecules and other small objects (nano-objects). Much of the work so far has exploited the excellent sensitivity and selectivity of fluorescence, but several new techniques, mostly based on nonlinear optics, have recently reached the single-molecule or single-nanoparticle regime. The chapter briefly discusses some results with reference to published reviews. Single-molecule techniques have now been incorporated into the arsenal of the physico-chemist and the cell biologist. However, the recent development of super-resolution techniques and of new labels suggests that further progress can be expected from measurements on single nano-objects in the next few years.

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Chapitres de livres sur le sujet "Single molecule conductance measurements"

Moore, A. M., B. A. Mantooth, A. A. Dameron, Z. J. Donhauser, P. A. Lewis, R. K. Smith, D. J. Fuchs et P. S. Weiss. « Measurements and Mechanisms of Single-Molecule Conductance Switching ». Dans Frontiers in Materials Research, 29–47. Berlin, Heidelberg : Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-77968-1_3.

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Thamankar, R., O. A. Neucheva, T. L. Yap et C. Joachim. « Surface Conductance Measurements on a MoS2 Surface Using a UHV-Nanoprobe System ». Dans Advances in Atom and Single Molecule Machines, 131–40. Berlin, Heidelberg : Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28172-3_10.

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Aradhya, Sriharsha V., Michael Frei, Mark S. Hybertsen et Latha Venkataraman. « Simultaneous Measurement of Force and Conductance Across Single Molecule Junctions ». Dans MEMS and Nanotechnology, Volume 6, 75–84. New York, NY : Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4614-4436-7_12.

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Yamada, Ryo. « Methods to Determine Electrical Conductance of Single-Molecule Junctions ». Dans Single-Molecule Electronics, 25–59. Singapore : Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0724-8_2.

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Yanagida, Toshio, Yoshiharu Ishii et Akihiko Ishijima. « Single-Molecule Measurements Using Microneedles ». Dans Single Molecule Enzymology, 143–59. Totowa, NJ : Humana Press, 2011. http://dx.doi.org/10.1007/978-1-61779-261-8_10.

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Kamsma, Douwe, et Gijs J. L. Wuite. « Single-Molecule Measurements Using Acoustic Force Spectroscopy (AFS) ». Dans Single Molecule Analysis, 341–51. New York, NY : Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7271-5_18.

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Seol, Yeonee, et Keir C. Neuman. « Single-Molecule Measurements of Topoisomerase Activity with Magnetic Tweezers ». Dans Single Molecule Enzymology, 229–41. Totowa, NJ : Humana Press, 2011. http://dx.doi.org/10.1007/978-1-61779-261-8_15.

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Cissé, Ismaïl, Pierre Mangeol et Ulrich Bockelmann. « DNA Unzipping and Force Measurements with a Dual Optical Trap ». Dans Single Molecule Analysis, 45–61. Totowa, NJ : Humana Press, 2011. http://dx.doi.org/10.1007/978-1-61779-282-3_3.

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Geffroy, Laurent, Pierre Mangeol, Thierry Bizebard et Ulrich Bockelmann. « RNA Unzipping and Force Measurements with a Dual Optical Trap ». Dans Single Molecule Analysis, 25–41. New York, NY : Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-7271-5_2.

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Iski, Erin V., Mahnaz El-Kouedi et E. Charles H. Sykes. « Scanning Tunneling Microscopy and Single Molecule Conductance ». Dans Nanotechnology in Undergraduate Education, 123–33. Washington DC : American Chemical Society, 2009. http://dx.doi.org/10.1021/bk-2009-1010.ch009.

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Actes de conférences sur le sujet "Single molecule conductance measurements"

Yee, Shannon, Jonathan Malen, Pramod Reddy, Rachel Segalman et Arun Majumdar. « Thermoelectricity at the Organic-Inorganic Interface ». Dans 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-22690.

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Electronic transport in molecular junctions has been studied through measurements of junction thermopower to evaluate the feasibility of thermoelectric (TE) energy generation using organic-inorganic hybrid materials. Energy transport and conversion in these junctions are heavily influenced by transport interactions at the metal-molecule interface. At this interface the discrete molecular orbitals overlap with continuum electronic states in the inorganic electrodes to create unique energy landscapes that cannot be realized in the organic or inorganic components alone. Over the past decade, scanning probe microscopes have been used to study the electronic conductance of single-molecule junctions[1–5]. Recently, we conducted measurements of junction thermopower using a modified scanning tunneling microscope (STM)[6]. Through our investigations, we have determined: (i) how the addition of molecular substituent groups can be used to predictably tune the TE properties of phenylenedithiol (PDT) junctions[7], (ii) how the length, molecular backbone, and end groups affect junction thermopower[8], and (iii) where electronic transport variations originate[9]. Furthermore, we have recently found that large (10 fold) TE enhancement can be achieved by effectively altering a (noble) metal junction using fullerenes (i.e., C60, PCBM, and C70). We associate the enhancement with the alignment of the frontier orbitals of the fullerene to the chemical potential of the inorganic electrodes. We further found that the thermopower can be predictably tuned by varying the work function of the contacts. This yields considerable promise for altering the surface states at interfaces for enhanced electronic and thermal transport. This paper highlights our work using thermopower as a probe for electronic transport, and reports preliminary results of TE conversion in fullerene-metal junctions.

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Mahmoud, Ahmed, Alessio Gagliardi et Paolo Lugli. « Theoretical study on conductance switching of single-molecule devices ». Dans 2014 IEEE 14th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2014. http://dx.doi.org/10.1109/nano.2014.6967981.

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Ravi, Divakar, C. P. Karthika et Arijit Sen. « Single molecule conductance : Role of electrode morphology at the nanoscale ». Dans SOLID STATE PHYSICS : PROCEEDINGS OF THE 57TH DAE SOLID STATE PHYSICS SYMPOSIUM 2012. AIP, 2013. http://dx.doi.org/10.1063/1.4791371.

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Pop, Eric. « Electron-Phonon Interaction and Joule Heating in Nanostructures ». Dans ASME 2008 3rd Energy Nanotechnology International Conference collocated with the Heat Transfer, Fluids Engineering, and Energy Sustainability Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/enic2008-53050.

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The electron-phonon energy dissipation bottleneck is examined in silicon and carbon nanoscale devices. Monte Carlo simulations of Joule heating are used to investigate the spectrum of phonon emission in bulk and strained silicon. The generated phonon distributions are highly non-uniform in energy and momentum, although they can be approximately grouped into one third acoustic (AC) and two thirds optical phonons (OP) at high electric fields. The phonon dissipation is markedly different in strained silicon at low electric fields, where certain relaxation mechanisms are blocked by scattering selection rules. In very short (∼10 nm) silicon devices, electron and phonon transport is quasi-ballistic, and the heat generation domain is much displaced from the active device region, into the contact electrodes. The electron-phonon bottleneck is more severe in carbon nanotubes, where the optical phonon energy is three times higher than in silicon, and the electron-OP interaction is entirely dominant at high fields. Thus, persistent hot optical phonons are easily generated under Joule heating in single-walled carbon nanotubes suspended between two electrodes, in vacuum. This leads to negative differential conductance at high bias, light emission, and eventual breakdown. Conversely, optical and electrical measurements on such nanotubes can be used to gauge their thermal properties. The hot optical phonon effects appear less pronounced in suspended nanotubes immersed in an ambient gas, suggesting that phonons find relaxation pathways with the vibrational modes of the ambient gas molecules. Finally, hot optical phonons are least pronounced for carbon nanotube devices lying on dielectrics, where the OP modes can couple into the vibrational modes of the substrate. Such measurements and modeling suggest very interesting, non-equilibrium coupling between electrons and phonons in solid-state devices at nanometer length and picoseconds time scales.

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Backer, Adam S., Mikael P. Backlund, Matthew D. Lew et W. E. Moerner. « Single-Molecule Orientation Measurements with a Quadrated Pupil ». Dans Imaging Systems and Applications. Washington, D.C. : OSA, 2013. http://dx.doi.org/10.1364/isa.2013.ith1d.4.

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Goun, Alexei. « Maximum Information Gain Measurements for Single Molecule Discrimination. » Dans Clinical and Translational Biophotonics. Washington, D.C. : OSA, 2020. http://dx.doi.org/10.1364/translational.2020.jth2a.21.

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Backer, Adam S., Mikael P. Backlund, Matthew D. Lew, Alexander R. Diezmann, Steffen J. Sahl et W. E. Moerner. « Single-molecule orientation measurements with a quadrated pupil ». Dans SPIE BiOS, sous la direction de Jörg Enderlein, Ingo Gregor, Zygmunt K. Gryczynski, Rainer Erdmann et Felix Koberling. SPIE, 2014. http://dx.doi.org/10.1117/12.2042097.

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Bowen, Benjamin P., Jorg Enderlein et Neal W. T. Woodbury. « Multiparameter single-molecule fluorescence measurements of DNA intercalating fluorophores ». Dans Biomedical Optics 2003, sous la direction de Dan V. Nicolau, Joerg Enderlein, Robert C. Leif et Daniel L. Farkas. SPIE, 2003. http://dx.doi.org/10.1117/12.486348.

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Turgeman, Lior, et Dror Fixler. « Fluorescence intensity fluctuations in single-molecule polarization sensitive measurements ». Dans SPIE BiOS, sous la direction de Jörg Enderlein, Zygmunt K. Gryczynski, Rainer Erdmann, Felix Koberling et Ingo Gregor. SPIE, 2012. http://dx.doi.org/10.1117/12.907270.

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Armstrong, Megan, Henry Hess et Stanislav Tsitkov. « Statistical inference in single molecule measurements of protein adsorption ». Dans Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XV, sous la direction de Alexander N. Cartwright, Dan V. Nicolau et Dror Fixler. SPIE, 2018. http://dx.doi.org/10.1117/12.2290918.

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