First principles investigation on transport properties of graphene based systems
First principles investigation on transport properties of graphene based systems
... nanoribbons ZTG zero transmission gap Chapter Introduction 1.1 The bottleneck of silicon -based electronics Modern electronics relies on the capabilities of semiconductor components to control electron ... carbon chain has (a) sp connection with carbon chain leads; (b) sp2 connection with carbon ribbon leads (optimized); (c) sp3 connection with capped carbon nanotube leads; (d) sp3 connection with ... fabrication of graphene nanoribbons 1.3.3 The electronic properties of graphene and graphene nanoribbons 11 1.3.4 Toward graphene- based field effect transistors 16 1.3.5 Toward graphene- based...
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Theoretical investigation on thermal properties of silicon based nanostructures
... THEORETICAL INVESTIGATION ON THERMAL PROPERTIES OF SILICON BASED NANOSTRUCTURES CHEN JIE (M.Sc., Nanjing University) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF ... DEPARTMENT OF PHYSICS NATIONAL UNIVERSITY OF SINGAPORE 2011 Dedicated to my wife Chunliu and our parents THEORETICAL INVESTIGATION ON THERMAL PROPERTIES OF SILICON BASED NANOSTRUCTURES c Copyright ... dynamics simulations, which are used in this study to investigate the thermal properties of silicon based nanostructures Using silicon nanowires (SiNWs) and silicon- germanium nanojunctions as examples,...
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Báo cáo " Influence of intradot Coulomb interaction on transport properties of an Aharonov-Bohm interferometer " ppt
... context, Bogdan et al [7] and Walter Hofstetter et al [8] studied the combination of the Kondo effect and the Fano effect How the intradot Coulomb interaction influences the phase coherence of ... Coulomb interactions, are in phase [1-3] and the intradot Coulomb interaction can induce dephasing under an appropriate condition We can express the Hamiltonian for the present system (with the quantum ... the Fermi level, one electron from the ring should jump into the dot Conclusion In conclusion, we obtained the current expression as a function of the intradot Coulomb interaction and the AB phase...
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First principles study on surface modification of antimony doped tin dioxide nanoparticles
... FIRST PRINCIPLES STUDY ON SURFACE MODIFICATION OF ANTIMONY DOPED TIN DIOXIDE NANOPARTICLES Mong Yu Siang (B.Sc (Hons), NUS) A THESIS SUBMITTED FOR THE DEGREE OF MASTER OF SCIENCE DEPARTMENT OF ... Such a method would involve the surface functionalization of nanoparticles 1.2: Introduction to surface modification Surface functionalization of semiconductor nanoparticles is an increasingly ... adsorption on ATO 41 4.3 Water adsorption on pure tin dioxide 46 4.4 Water adsorption on ATO 52 Surface modification using dichloroacetylene 60 5.1 Establishing surface model 62 5.2 Adsorption of...
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Báo cáo hóa học: " Influence of Landau level mixing on the properties of elementary excitations in graphene in strong magnetic field" docx
... interaction leads to mixing of transitions between different pairs of Landau levels, changing the resulting energies of elementary excitations Characteristic energy of Coulomb interaction in magnetic ... Landau level mixing and show how the properties of these excitations change in comparison with the lowest Landau level approximation For magnetoexcitons, we take into account the mixing of asymptotically ... magnetoexcitons in graphene, which is applied in Section to study in uence of Coulomb interaction and Landau level mixing on their properties In Section 4, we study magnetoplasmons in graphene in the random...
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INVESTIGATION OF ELECTRIC AND THERMOELECTRIC PROPERTIES OF GRAPHENE NANORIBBON
... 1.1.1 Graphene in carbon family 15 1.1.2 Electronic properties of graphene 17 1.1.3 Band structure in graphene 18 1.1.4 Band gap in graphene nanoribbon (GNR) 19 1.2 Thermoelectrical ... Thermoelectrical properties of graphene 21 1.2.1 Seebeck coefficient and the figure of merit ZT 21 1.2.2 Thermoelectrical properties in graphene 23 1.3 Chapter 2.1 Objective and scope of this ... 3.112D plot of Conductance of graphene nanoribbon with width of 60nm as a function of Vsd and Vbg at T=4.3 K 51 Figure 4.1 Optical image of thermal power device, is heater, and is thermometers...
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Tài liệu Báo cáo "Effect of the preparation conditions on the properties of Fe-Pt nanoparticles produced by sonoelectrodeposition " pptx
... composition of the Fe-Pt nanoparticles was controlled by adjusting the current density (corresponding to the applied voltage) When the current density of 15 – 20 mA/cm2, the composition of nanoparticles ... [21] The broad peak on the DSC trace in the FePt nanoparticles suggests that there was no such transition in the FePt nanoparticles upon annealing The formation of the L10 FePt phase was N.H Luong ... degassing of the electrode surface, and an increased reaction rate [15] In this paper, we report the use of the sonoelectrochemical method for the preparation of FePt nanoparticles Experimental The sonoelectrochemical...
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Tài liệu Báo cáo Y học: The effects of low pH on the properties of protochlorophyllide oxidoreductase and the organization of prolamellar bodies of maize (Zea mays) pot
... (1993) The effect of cross-linking of the subunits of NADPH -protochlorophyllide oxidoreductase on the aggregational state of protochlorophyllide Photosynthetica 29, 205–218 Wiktorsson, B., Ryberg, ... The effect of the presence of the adenylates on the ability of POR-PChlide640 to undergo photoconversion was checked by comparing the efficiency of photoconversion of PLB samples containing excess ... isolate the contribution of the pH- driven conformational changes from the other effects, a parallel study was carried out on the low- pH induced blue shift in the PChlide absorption maximum of nonphotoconverted...
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Báo cáo " Influence of cooling rate on the properties of Fe73.5Si13.5B9Nb3Au1 ribbons " docx
... wheel, the longer path The increasing speed of the wheel make the thickness of ribbons thinner and the ratio between the area and volume of the ribbons that contact with the surface of the wheel ... that the wheel gets heat faster and more than from inside of the ribbon, so the ribbon is cooled faster Therefore, the speed of the wheel is proportional to the cooling rate It means that two concepts ... corresponds to the crystallization of α-Fe(Si) phase and the second one is related to the forming of boride phase (Fig 2) When increasing cooling rate, the first peak (Tp1) and the second one (Tp2)...
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Electronic transport properties of single crystal silicon nanowires fabricated using an atomic force microscope
... scanned over the silicon surface at speed of 0.1– m=s leads to an 0.2–2 nm-thick oxide pattern of width 20 –60 nm The oxide features formed by AFM lithography can be then transferred to the silicon ... supported on an insulating layer (Fig 1) As-doped Unibond J silicon- on-insulator (SOI) samples with an ultra-thin single- crystal silicon top layer (typically 15 –20 nm) were used One advantage of this ... the wire It can be re- 1001 Fig IDS –VDS curves and IDS –VG transconductance (inset) curves acquired at 300 K for the silicon nanowire device presented in Fig A constant backgate of 10 V was applied...
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Báo cáo khoa học: Protein engineering of pyruvate carboxylase Investigation on the function of acetyl-CoA and the quaternary structure doc
... respectively, and the elution prole was not dependent on the protein concentration (C) and (D) The elution prole of PC-(BC) was markedly dependent on the protein concentration: at the high concentration ... evident from the prole Such a phenomenon Table Eect of 0.1 mM acetyl-CoA on the pyruvate carboxylation of intact PC and on the ATP cleavage reactions of intact PC and PC-(BC) One unit of enzyme ... effect on the association of the two proteins, as the elution prole was hardly affected by preincubation of the samples with 0.1 mM acetyl-CoA followed by elution with buffer containing the same concentration...
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Báo cáo " Effects of the conditions of the microemulsion preparation on the properties of Fe3O4 nanoparticles " pot
... Q in the other microemulsion, upon mixing, they will form precipitate PQ, which will be contained entirely within the aqueous cores of the microemulsions The growth of these particles in microemulsions ... diffusion of solutes from the solution or/and aggregation of other nuclei to their surface until the final size was attained In conventional coprecipitation, size (d) can be controlled by concentration ... understood by the fact that the reaction could not complete under these conditions Whereas, magnetic properties of samples of type B were ferromagnetic with the saturation magnetization Ms of 50 emu/g...
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cross plane electronic and thermal transport properties of p type la0.67sr0.33mno3 lamno3 perovskite oxide metal semiconductor superlattices
... the potential of this oxide superlattice approach IV CONCLUSIONS Cross- plane transport in LSMO/LMO superlattices has been presented as a potential route to a p- type thermoelectric material Epitaxial ... see http://jap.aip.org/about/rights _and_ permissions 063714-6 Jha et al J Appl Phys 112, 063714 (2012) FIG (a) Measured in -plane resistivity and (b) extracted cross- plane resistivity of p- type LSMO/LMO ... Cross- plane electronic transport in LSMO/LMO superlattices The in -plane temperature dependent resistivity of epitaxial LSMO/LMO superlattices showed a magnetic phase transition temperature (TP) of 250...
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evaluation of shape and size effects on optical properties of zno pigment
... morphology effects of ZnO pigments on their optical properties The synthesis conditions were according to our previous works [18,19] Typical synthesis conditions of ZnO powders synthesized in this ... concentration of zinc nitrate and potassium hydroxide solutions (Molar) Experimental 2.1 Preparation of pigments ZnO samples were prepared by hydrothermal method and used for the evaluation of ... morphologies of ZnO pigment was synthesized by a simple hydrothermal method Evaluation of their optical properties indicated that the spectral reflectance was strongly affected by particle shape and size...
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