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,...

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...

Temperature-Controlled Growth of Silicon-Based Nanostructures by Thermal Evaporation of SiO Powders

... Conclusion Silicon-based nanostructures with different colors, morphologies, and microstructures were formed over a wide temperature range from 890 to 1320 °C by thermal evaporation of SiO powders ... decomposition of SiO described by 2SiO ) Si + SiO2 After the Si nucleus is formed, it will grow into a larger particle by continuously adsorbing SiO from the vapor phase To effectively adsorb SiO from ... the EDS results Discussion The results described in Section show that, by thermal evaporation of SiO powders at 1350 °C for h under 300 Torr Pan et al Figure 11 SEM images of the products formed...

Effects of simultaneous doping with boron and phosphorous on the structural, electronic and optical properties of silicon nanostructures

... asymptotically the value of the band-gap of the undoped Si-nw This is another indication of how doping can modify the electronic and optical properties of the Si nanostructures Conclusions 3.2 3.4 ... systematic analysis of the effect of the B and P codoping in Si-nw, concentrating not only on the structural properties but also on how doping inﬂuences the electronic and optical properties Here, ... concentrate on the dependence of the doped Si-nw properties on the dopant concentration, we note ﬁrst that on augmenting the number of atoms in the cell (thus lowering the dopant concentration),...

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Large scale synthesis, characterization and photoluminescence properties of amorphous silica nanowires by thermal evaporation of silicon monoxide

... single step process using thermal evaporation of silicon monoxide under argon atmosphere with traces of oxygen The nanowires were free from metal contaminations and showed blue photoluminescence at ... its simplicity and the low cost Conclusions Amorphous silicon dioxide nanowires of several hundred microns in length and tens of nanometers in diameter have been synthesized in bulk by a non-catalytic ... Ni) was found to be essential for the SiOx nanowires growth and also different from bi-cycle chain-like morphology of silica nanowires observed by Kar and Chaudhuri [14] during carbon-assisted...

Báo cáo hóa học: " Effect of the Nd content on the structural and photoluminescence properties of silicon-rich silicon dioxide thin film" pdf

... http://www.nanoscalereslett.com /content/ 6/1/161 function of the Nd concentration and the annealing temperature in relation with their microstructures The Nd- doped silicon- rich silicon oxide (SRSO) thin layers were synthesized ... emission of Nd3 + ions is more efficient while Si-np are formed, and while the Nd content is low (0.08 at.%) In such conditions, Nd3 + ions benefit from the sensitizing effect of Si-np and from the ... doi:10.1186/1556-276X-6-161 Cite this article as: Debieu et al.: Effect of the Nd content on the structural and photoluminescence properties of silicon- rich silicon dioxide thin films Nanoscale Research Letters 2011...

Báo cáo hóa học: " Inﬂuence of Surface Modiﬁed MWCNTs on the Mechanical, Electrical and Thermal Properties of Polyimide Nanocomposites" ppt

... Morphology of the MWCNTs Figure 5(a–c) shows the SEM micrographs of the MWCNTs of the as-produced and the functionalized tubes As seen from Fig 5a, the raw MWCNTs are produced in the form of agglomerated ... amide -MWCNTs/ polyimide and that of acid -MWCNTs/ polyimide composites are almost 123 One unique property of the MWCNTs is their electrical conductivity because of their large aspect ratio and mobile ... degradation starts ** Temperature at which wt% of the material has degraded Fig Effect of MWCNTs contents on the electrical conductivity of the MWCNTs/ polyimide nanocomposites Conclusion Fig a...

Báo cáo hóa học: " Inﬂuence of Nanogels on Mechanical, Dynamic Mechanical, and Thermal Properties of Elastomers" pdf

... matrix and SBS gels were mixed with NR at a given concentration, to investigate their effect on the morphology, mechanical, dynamic mechanical and thermal properties of raw SBR and NR Morphology of ... diffusion of these curing agents during prevulcanization and hence higher amount of crosslinking The effect of sulfur crosslinking is also very pronounced on the mechanical properties of different ... strength and modulus, and within ±3% for elongation at break values Dynamic mechanical properties of gels, as well as gel ﬁlled rubbers were measured as a function of temperature using the Dynamic...

Báo cáo hóa học: " A pH sensor based on electric properties of nanotubes on a glass substrate" pptx

... Japan Cover glass was purchased from Matsunami Glass Ind., Ltd., Japan A photoresist (OFPR-800) was purchased from Tokyo Ohka Kogyo Co., Ltd., Japan CNT immobilization on glass Fabrication of ... to fabricate a nanotube device on a cover glass and to investigate its applications Regarding the fabrication process of the nanotube FET sensor, chemical vapor deposition (CVD) method has been ... spincoater Pairs of areas were fabricated in the PMMA ﬁlm using photolithography and ordered pairs of electrode patterns were obtained (Fig 1a) A 1% APS solution was dropped on the substrate It was...

Investigation of chaotic advection regime and its effect on thermal performance of wavy walled microchannels

... 7.4.4 Chaotic advection near resonance 136 7.4.5 Effect of Re 138 7.4.6 Effect of conjugated condition 140 7.5 Conclusion 145 Chapter Conclusion and recommendations ... studied the effect of chaotic advection and the transition to chaos in wavy microchannels Their results showed that presence of chaotic advection in the system can enhance the thermal performance ... relation between the thermal performance and the advection regime  Evaluation of the wavy walled microchannels for electronics cooling using experimental investigation and also to validate the numerical...

Thermal properties of the vernacular buildings envelopes: the case of the "Sassi di Matera" and "Trulli di Alberobello

... rocky church crypt [3], the energetic behavior and the microclimate of different hypogeous structures in the site of the "Sassi of Matera" [4, 5], and the thermal behavior of different opaque envelopes ... namely, “Tufo of Matera” for the structures of the "Sassi of Matera," and “Stone of Fasano” for the structures of the "Trulli of Alberobello, " they are different with regard to form and constructive ... these structures work as "natural regulators" of thermohygrometric comfort Constructive characteristics of the "Sassi of Matera" and "Trulli of Alberobello" In the South of Italy, the sites of...

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...

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...

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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