Dissertations / Theses on the topic 'Break junction'
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Xiang, Dong [Verfasser]. "Fabrication and utilization of mechanically controllable break junction for bioelectronics / Dong Xiang." Aachen : Hochschulbibliothek der Rheinisch-Westfälischen Technischen Hochschule Aachen, 2012. http://d-nb.info/1023017288/34.
Full textSaaty, Kara. "Design of a Mechanically Controllable Break Junction to Measure Quantum Conductance of Gold." Thesis, The University of Arizona, 2013. http://hdl.handle.net/10150/314645.
Full textETHIRAJ, SINDUJA. "Cell-Cell Junction Signaling Regulating DNA Double-Strand Break Repair In Breast Cells." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/132.
Full textShimizu, Naoto. "The MRE11 nuclease promotes homologous recombination not only in DNA double-strand break resection but also in post-resection in human TK6 cells." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263552.
Full text京都大学
新制・課程博士
博士(医学)
甲第23091号
医博第4718号
京都大学大学院医学研究科医学専攻
(主査)教授 篠原 隆司, 教授 増永 慎一郎, 教授 小川 誠司
学位規則第4条第1項該当
Doctor of Medical Science
Kyoto University
DFAM
Soukup, Randal J. "The roles of hMSH4-hMSH5 and hMLH1-hMLH3 in meiotic double strand break repair." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1480641841905001.
Full textMOTTA, CARLO. "First-principles study of electronic transport in organic molecular junctions." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2013. http://hdl.handle.net/10281/40094.
Full textXing, Yangjun. "Measurement and Visualization of Electron Transfer at the Single Molecule Level." Diss., Temple University Libraries, 2009. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/47725.
Full textPh.D.
Molecular electronics based on bottom-up electronic circuit design is a potential solution to meet the continuous need to miniaturize electronic devices. The development of highly conductive molecular wires, especially for long distance charge transfer, is a major milestone in the molecular electronics roadmap. A challenge presented by single molecule conductance is to define the relative influence of the molecular "core" and the molecular "interconnects" on the observed currents. Much focus has been placed on designing conductive, conjugated molecules. However, the electrode-molecule contacts can dominate the responses of metal-molecule-metal devices. We have experimentally and theoretically probed charge transfer through single phenyleneethynylene molecules terminated with thiol and carbodithioate linkers, using STM break-junction and non-equilibrium Green's function methods. The STM break-junction method utilizes repeatedly formed circuits where one or a few molecules are trapped between two electrodes, at least one of which has nanoscale dimensions. The statistical analysis of thousands of measurements yields the conductance of single molecules. Experimental data demonstrate that the carbodithioate linker not only augments electronic coupling to the metal electrode relative to thiol, but reduces the barrier to charge injection into the phenyleneethynylene bridge. The theoretical analysis shows that sulfur hybridization provides the genesis for the order-of-magnitude increased conductance in carbodithioate-terminated systems relative to those that feature the thiol linker. Collectively, these data emphasize the promising role for carbodithioate-based connectivity in molecular electronics applications involving metallic and semi-conducting electrodes. One of the strategies for building molecular wires that can transfer charge over long distance is to incorporate metal ions into the conductive molecular core. Peptide nucleic acid (PNA) is a great candidate for this purpose. Studying the conductivity of PNA can not only contribute to a better understanding of charge transfer through biomolecules, but can also help develop better molecular wires and other building blocks of molecular electronics. We study the charge transfer of PNA molecules using the STM break-junction technique and compare with traditional macroscopic voltammetric measurements. By measuring the resistance of different PNA molecules, we hope to develop a deep understanding of how charge transport though PNA is affected by factors such as the number and type of natural and artificial bases, embedded metal ions, pH, etc. Self-assembled monolayers (SAMs) of porphyrins are of great interest due to their diverse applications, including molecular devices, nano-templates, electrocatalysis, solar cells, and photosynthesis. We combined a molecular level study of the redox reactions using electrochemical scanning tunneling microscopy (EC-STM) with a macroscopic electrochemical technique, cyclic voltammetry (CV), to study two redox active porphyrin molecules, TPyP (5,10,15,20-Tetra(4-Pyridyl)-21H,23H-Porphine) and 5, 10, 15, 20-tetrakis (4-carboxylphenyl)-21H, 23H-porphine (TCPP). We showed that the adsorbed oxidized TPyP molecules slowly change to brighter contrast, consistent with the appearance of the reduced form of TPyP, under reduction condition (0.0VSCE). The time scale of the slow reduction is in the order of tens of minutes at 0.0VSCE, but accelerates at more negative potentials. We propose that protonation and deprotonation processes play an important role in the surface redox reaction due to geometric restriction of the molecules adsorbed on the surface. EC-STM and CV experiments were performed at various pH values to investigate the mechanism of this anomalously slow redox reaction. Our results show that the increased concentration of H+ hinders the reduction of porphyrins, a feature that has not been reported preciously. This provides insight into the details of the surface redox reaction.
Temple University--Theses
Dai, Zhenting. "Coherent and Dissipative Transport in Metallic Atomic-Size Contacts." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/19880.
Full textGoodman, Caitlin Elizabeth. "A Novel Method to Analyze DNA Breaks and Repair in Human Cells." Wright State University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=wright1525086265360859.
Full textRoessner, Daniel. "Contribution à l'étude du comportement mécanique des carcasses textiles de bandes transporteuses : optimisation de la jonction." Thesis, Mulhouse, 2010. http://www.theses.fr/2010MULH4553/document.
Full textThe conveyor belt is used as a material and object transportation tool in a lot of industries such as underground mines, quarries, food industries, agribusinesses or supermarkets. The studied subject is the underground mine conveyor belt, because of their transportation and use difficult conditions.Indeed, the conveyor belt must be cut to be dispatched using belt reeling and joined afterwards in the underground mine forming an endless belt. However, the junction is the weakest part of the conveyor belt due to the 50% belt weakening. The aim of this study is to propose a new junction solution. After analysing the underground belt mechanical and chemical use conditions, the different junction types have been analysed. A junction advantage and inconvenience comparison has been presented. Then, the junction mechanical behaviour has been studied using an original mechanical setup reproducing the mechanical junction. The different parameter influence has been evaluated using a new adimensional indicator called junction tensile strength efficiency. In the last part, a new junction solution made by a sewn has been explored. The sewn junction tensile efficiency has been tested on a tensile strength machine and its fatigue efficiency has been verified through dynamic tests. New outlines in the conveyor belt joining are open as a result of the sewn junction solution development
Afsari, Mamaghani Sepideh. "The Formation of Two Dimensional Supramolecular Structures and Their Use in Studying Charge Transport at the Single Molecule Level at the Liquid-Solid Interface." Diss., Temple University Libraries, 2015. http://cdm16002.contentdm.oclc.org/cdm/ref/collection/p245801coll10/id/350915.
Full textPh.D.
Understanding charge transport through molecular junctions and factors affecting the conductivity at the single molecule level is the first step in designing functional electronic devices using individual molecules. A variety of methods have been developed to fabricate metal-molecule-metal junctions in order to evaluate Single Molecule Conductance (SMC). Single molecule junctions usually are formed by wiring a molecule between two metal electrodes via anchoring groups that provide efficient electronic coupling and bind the organic molecular backbone to the metal electrodes. We demonstrated a novel strategy to fabricate single molecule junctions by employing the stabilization provided by the long range ordered structure of the molecules on the surface. The templates formed by the ordered molecular adlayer immobilize the molecule on the electrode surface and facilitate conductance measurements of single molecule junctions with controlled molecular orientation. This strategy enables the construction of orientation-controlled single molecule junctions, with molecules lacking proper anchoring groups that cannot be formed via conventional SMC methods. Utilizing Scanning Tunneling Microscopy (STM) imaging and STM break junction (STM-BJ) techniques combined, we employed the molecular assembly of mesitylene to create highly conductive molecular junctions with controlled orientation of benzene ring perpendicular to the STM tip as the electrode. The long range ordered structure of mesitylene molecules imaged using STM, supports the hypothesis that mesitylene is initially adsorbed on the Au(111) with the benzene ring lying flat on the surface and perpendicular to the Au tip. Thus, long range ordered structure of mesitylene facilitates formation of Au-π-Au junctions. Mesitylene molecules do not have standard anchoring groups providing enough contact to the gold electrode and the only assumable geometry for the molecules in the junction is via direct contact between Au and the π system of the benzene ring in mesitylene. SMC measurements for Au/mesitylene/Au junctions results in a molecular conductance value around 0.125Go, two orders of magnitude higher than the measured conductance of a benzene ring connected via anchoring groups. We attributed this conductance peak to charge transport perpendicular to the benzene ring due to direct coupling between the π system and the gold electrode that happens in planar orientation. The conductance we measured for planar orientation of benzene ring is two order of magnitude larger than conductance of junctions formed with benzene derivatives with conventional linkers. Thus, altering the orientation of a single benzene-containing molecule between the two electrodes from planar orientation to the upright attached via the linkers, results in altering the conductivity in a large order. Based on these findings, by utilizing STM imaging and STM-BJ in an electrochemical environment including potential induced self-assembly formation of terephthalic acid, we designed an electrochemical single molecule switch. Terephthalic acid forms large domains of ordered structure on negatively charged Au(111) surface under negative electrochemical surface potentials with the benzene ring lying flat on the surface due to hydrogen bonding between carboxylic acid groups of neighboring molecules. Formation of long range ordered structure facilitates direct contact between the π system of the benzene ring and the gold electrodes resulting in the conductance peak. On positively charged Au(111), deprotonation of carboxylic acid groups leads to absence of long range ordered structure of molecules with planar orientation and absence of the conductance peak. In this case alternating the surface (electrode) potential from negative to positive charge densities induces a transition in the adlayer structure on the surface and switches conductance value. Hence, electrochemical surface potential can, in principle, be employed as an external stimulus to switch single molecule arrangement on the surface and the conductance in the junction. The observation of conductance switching due to molecule’s arrangement in the junction lead to the hypothesis that for any benzene derivative, an orientation-dependent conductance in the junction due to the contact geometry (i.e. electrode-anchoring groups versus direct electrode-π contact) should be expected. Conventional techniques in fabricating single molecule junctions enable accessing charge transport along only one direction, i.e., between two anchoring groups. However, molecules such as benzene derivatives are anisotropic objects and we are able to measure an orientation-dependent conductance. In order to systematically study anisotropic conductivity at single molecule level, we need to measure the conductance in different and well-controlled orientations of single molecules in the junction. We employed the same EC-STM-BJ set up for SMC measurements and utilize electrochemical potential of the substrate (electrode) as the tuning source to variate the orientation of the single molecule in the junction. We investigated single molecule conductance of the benzene rings with carboxylic acid functional groups in two orientations: one with the benzene ring bridging between two electrodes using carboxylic acids as anchoring groups (upright); and one with the molecule lying flat on the substrate perpendicular to the STM tip (planar). Physisorption of these species on the Au (111) single crystal electrode surface at negative electrochemical potentials results in an ordered structure with the benzene ring in a planar orientation. Positive electrochemical potentials cause formation of the ordered structure with molecules standing upright due to coordination of a deprotonated carboxyl groups to the electrode surface. Thus, formation of the single molecule junction and consequently conductivity measurements is facilitated in two directions for the same molecule and anisotropic conductivity can be studied. In engineering well-ordered two-dimensional (2-D) molecular structures with controlled assembly of molecular species, pH can be employed as another tuning source for the molecular structures and adsorption in experiments conducted in aqueous solutions. Based on simple chemical principles, amine (NH2) groups are hydrogen bond acceptors and donors. Amines are soluble in water and protonation results in protonated (NH3+) and unprotonated (NH2) amine groups in acidic and moderately acidic/neutral solutions, respectively. Thus, amines are suitable molecular building blocks for fabricating 2-D supramolecular structures where pH is employed as a knob to manipulate intermolecular hydrogen bonding leading to phase transitions. We investigated pH induced structural changes in the 1,3,5–triaminobenzene (TAB) monolayer and the formation/disruption of hydrogen bonds between neighboring molecules. Our STM images indicate that in the concentrated acidic solution, the protonated amine groups of TAB are not able to form H-bonds and long range ordered structure of TAB does not form on the Au(111) surface. However, in moderately acidic solution (pH ~ 5.5) at room temperature, protonation on the ring carbon atom generates species capable of forming H-bonds leading to the formation of the long range ordered structures of TAB molecules. Utilizing EC-STM set up, we investigated the controllable fabrication of a TAB 2-D supramolecular structure based on amine-amine hydrogen bonding and effect of pH in formation of ordered/disordered TAB network.
Temple University--Theses
Würfel, Jan Ulrich. "Molecular break-junctions interaction with light and conductance switching /." Karlsruhe : FZKA, 2005. http://bibliothek.fzk.de/zb/berichte/FZKA7164.pdf.
Full textWeber, David [Verfasser]. "Current-Induced Switching in Superconducting Break Junctions / David Weber." Konstanz : Bibliothek der Universität Konstanz, 2018. http://d-nb.info/1162059087/34.
Full textCafe, Peter F. "Towards reliable contacts of molecular electronic devices to gold electrodes." Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/3870.
Full textCafe, Peter F. "Towards reliable contacts of molecular electronic devices to gold electrodes." University of Sydney, 2008. http://hdl.handle.net/2123/3870.
Full textSYNOPSIS OF THIS THESIS The aim of this thesis is to more fully understand and explain the binding mechanism of organic molecules to the Au(111) surface and to explore the conduction of such molecules. It consists of five discreet chapters connected to each other by the central theme of “The Single Molecule Device: Conductance and Binding”. There is a deliberate concentration on azine linkers, in particular those with a 1,10-phenanthroline-type bidentate configuration at each end. This linker unit is called a “molecular alligator clip” and is investigated as an alternative to the thiol linker unit more commonly used. Chapter 1 places the work in the broad context of Molecular Electronics and establishes the need for this research. In Chapter 2 the multiple break-junction technique (using a Scanning Tunnelling Microscope or similar device) was used to investigate the conductance of various molecules with azine linkers. A major finding of those experiments is that solvent interactions are a key factor in the conductance signal of particular molecules. Some solvents interfere with the molecule’s interaction with and attachment to the gold electrodes. One indicator of the degree of this interference is the extent of the enhancement or otherwise of the gold quantized conduction peak at 1.0 G0. Below 1.0 G0 a broad range for which the molecule enhances conduction indicates that solvent interactions contribute to a variety of structures which could bridge the electrodes, each with their own specific conductance value. The use of histograms with a Log10 scale for conductance proved useful for observing broad range features. vi Another factor which affects the conductance signal is the geometric alignment of the molecule (or the molecule-solvent structure) to the gold electrode, and the molecular alignment is explored in Chapters 3 for 1,10-phenanthroline (PHEN) and Chapter 4 for thiols. In Chapter 3 STM images, electrochemistry, and Density Functional Theory (DFT) are used to determine 1,10-phenanthroline (PHEN) structures on the Au(111) surface. It is established that PHEN binds in two modes, a physisorbed state and a chemisorbed state. The chemisorbed state is more stable and involves the extraction of gold from the bulk to form adatom-PHEN entities which are highly mobile on the gold surface. Surface pitting is viewed as evidential of the formation of the adatom-molecule entities. DFT calculations in this chapter were performed by Ante Bilic and Jeffery Reimers. The conclusions to Chapter 3 implicate the adatom as a binding mode of thiols to gold and this is explored in Chapter 4 by a timely review of nascent research in the field. The adatom motif is identified as the major binding structure for thiol terminated molecules to gold, using the explanation of surface pitting in Chapter 3 as major evidence and substantiated by emergent literature, both experimental and theoretical. Furthermore, the effect of this binding mode on conductance is explored and structures relevant to the break-junction experiment of Chapter 2 are identified and their conductance values compared. Finally, as a result of researching extensive reports of molecular conductance values, and having attempted the same, a simple method for predicting the conductance of single molecules is presented based upon the tunneling conductance formula.
Johnson, Tyler, and Tyler Johnson. "Exploring Chemistry and Physics at the Nanoscale Using Mechanically Controlled Break Junctions." Thesis, The University of Arizona, 2016. http://hdl.handle.net/10150/622839.
Full textSysoiev, Dmytro [Verfasser]. "Synthesis and properties of photochromic difurylethenes for mechanically controlled break junctions / Dmytro Sysoiev." Konstanz : Bibliothek der Universität Konstanz, 2012. http://d-nb.info/102321038X/34.
Full textWürfel, Jan Ulrich [Verfasser]. "Molecular break-junctions : interaction with light and conductance switching / Forschungszentrum Karlsruhe GmbH, Karlsruhe. Jan Ulrich Würfel." Karlsruhe : FZKA, 2005. http://d-nb.info/977281256/34.
Full textMd, Maminur Rahman. "Genetic Evidence for the Involvement of Mismatch Repair Proteins, PMS2 and MLH3, in a Late Step of Homologous Recombination." Doctoral thesis, Kyoto University, 2021. http://hdl.handle.net/2433/263575.
Full text京都大学
新制・課程博士
博士(医科学)
甲第23114号
医科博第125号
京都大学大学院医学研究科医科学専攻
(主査)教授 斎藤 通紀, 教授 篠原 隆司, 教授 滝田 順子
学位規則第4条第1項該当
Doctor of Medical Science
Kyoto University
DFAM
Tolley, Robert Douglas. "Charge Transport in Nano-Constrictions and Magnetic Microstructures." Miami University / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=miami1344095174.
Full textLeoni, Thomas. "Contribution à l'étude des contacts atomiques et moléculaires ponctuels." Phd thesis, Université de la Méditerranée - Aix-Marseille II, 2009. http://tel.archives-ouvertes.fr/tel-00412904.
Full textDednam, Wynand. "Atomistic simulations of competing influences on electron transport across metal nanocontacts." Thesis, Universidad de Alicante, 2019. http://hdl.handle.net/10500/26155.
Full textPhysics
Ph. D. (Physics)
Chen, Peng-Yu, and 陳鵬宇. "Room-temperature conductance quantization at a mechanically controlled break junction." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/36376219839057070566.
Full text輔仁大學
物理學系
92
Abstract Room-temperature conductance quantization at a mechanically controlled break junction We have studied conductance quantization through point-contact junctions of metal wires using a mechanically controlled wire-breaking device in ambient condition. This experiment demonstrates that the conduction through a nano constriction between two electron reservoirs can be treated by Landauer's formula,where G0 is the unitary conductance 2e^2/h , n denotes each possible conduction channel, and T is the transmission coefficient for each channel at the junction. The Landauer’s formula states a specific quantum size effect: T either equal to 1 or 0, in a ballistic constriction, e.g., the physical dimension of the confinement is much smaller than the electron mean free path. We have tested quantized conductance with various metals such as Au, Pt, Cu, and Ag. For Pt junctions, the standard deviation of a quantized conductance was found to be the smallest. This could be explained by a lower Pt diffusivity at room temperature. The junctions of Au and Pt also behaved differently as stretched. The conductance of Au tended to drop stepwise to the lowest quantized G whereas the Pt junctions often drifted back to a higher G value. Keyword:conductance、ballistic transport、Landauer's formula、 Mechanically Controlled Break Junction、nanowire
Chiu, I.-Chen, and 邱怡貞. "A study of the "break-film" structure of YBCO/Au/YBCO Proximity Junction." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/81684327033857678133.
Full text國立清華大學
物理學系
88
Abstract The superconducting proximity effect can be used to produce Josephson junctions in HTS structures with a normal conducting barrier. We describe a work on "break-film" junctions made by Au bridge to link the upper and lower layer of a YBa2Cu3O7(YBCO)-SrTiO3(STO)-YBa2Cu3O7 (YBCO) trilayer. The structures are grown in situ by pulse laser deposition. In our early structure we observed no supercurrent. That is because the exposure of the film in air before N-layer evaporation gives rise to an interface potential barrier. When T increases from 4.2K, the gap feature broadens until it is barely resolved around 65K. Such behavior is in general agreement with the BTK theory. We observed zero-bias anomaly (ZBA) spectra in some of our "break-film" junctions, which can also be explained by the BTK theory with the s-wave symmetry of the superconducting order parameter of YBCO. Our junction has a critical current density about 1.6*104 A/cm2 at 4.2K, IcR-n=0.125mV. The characteristic of the junction implies a high potential for applications.
"Measurements and Control of Charge Transport through Single DNA Molecules via STM Break Junction Technique." Doctoral diss., 2016. http://hdl.handle.net/2286/R.I.38368.
Full textDissertation/Thesis
Doctoral Dissertation Chemistry 2016
Hsu, Chan-Hsiang, and 許展翔. "Improvement of the Acquisition System for STM-based Break Junction for Conductance Measurements of meso-Pyridylethynyl Porphyrins." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/99248323422140977014.
Full text國立臺灣大學
化學研究所
101
Measuring the conductance of metal-molecule-metal (MMM) junctions is the most fundamental and direct way to investigate molecular electronics, which correlates the structure of molecules to their electrical behaviors under nanometer-scale. To create suitable widths of the electrode-gaps for the formation of MMM junctions, most experimental techniques start from the breaking events of metallic point contacts and monitor the current variation to detect the signal caused by the bridging of molecules. Devices with wide current windows are required to conduct the procedure mentioned above. A dynamic signal acquisition device with high resolving ability is connected to the commercial scanning tunneling microscopy (STM). The dynamic range of data acquired during STM break junction (STM-bj) is widened from 3 orders to 6 orders of magnitude, in the range of which it is made possible to record the conductance distributions of gold point contacts and MMM junctions in one experiment setup. The conductance of a series of porphyrin derivatives were measured in the narrower dynamic range of the commercial STM before. In previous results, two sets of conductance distribution are shown in STM I(s) method, during which no gold point contacts occur; but the higher one is absence in STM-bj, which form gold point contacts in each cycle. However, the noise level of the commercial STM is much higher than the range of the lower one in the setup of STM-bj. It is unsure whether the gold point contacts hinder the more conductive junctions only. With the improvement of the data acquisition, the conductance and junction geometry of these porphyrin derivatives are probed by STM I(s) method and STM-bj again. In STM-bj, the conductance distributions of both gold point contacts and the less conductive junctions are recorded. It is clearly confirmed that only the more conductive junctions are hinders by gold point contacts and the possibility of possessing a tilted angle-confined geometries in these junctions is raised. The limits of the junction stretching distances are close to the distance between the two nitrogen atoms in the anchoring groups. This result further proves that the less conductive junctions bridge the electrodes by anchoring. In STM I(s) method, three set of conductance distribution are observed. The highest one is above the upper limit of the previous current windows and is attributed to the junction by lying porphyrins on the gold surfaces.
"Contact and Length Dependent Effects in Single-Molecule Electronics." Doctoral diss., 2013. http://hdl.handle.net/2286/R.I.18705.
Full textDissertation/Thesis
Ph.D. Materials Science and Engineering 2013
Nejedlý, Jindřich. "Syntéza π-elektronových systémů vhodných pro přenos a retenci náboje." Doctoral thesis, 2021. http://www.nusl.cz/ntk/nusl-437757.
Full text"New Measurement Techniques and Their Applications in Single Molecule Electronics." Doctoral diss., 2012. http://hdl.handle.net/2286/R.I.14684.
Full textDissertation/Thesis
Ph.D. Electrical Engineering 2012
Liu, Shoupeng [Verfasser]. "Conductance of individual DNA molecules measured with adjustable break junctions = Messung des Leitwerts einzelner DNA-Moleküle mithilfe regelbaren Bruchkontaktelektroden / vorgelegt von Shoupeng Liu." 2010. http://d-nb.info/1004099096/34.
Full text"Measurement of Molecular Conductance." Doctoral diss., 2011. http://hdl.handle.net/2286/R.I.9439.
Full textDissertation/Thesis
Ph.D. Chemistry 2011