surface properties of nanostructures supported on semiconductor substrates

... downshift in phonon frequency of LO and TO phonon peaks Another one is the thermal anharmonicity effect caused by temperature change Anharmonicity entails the participation of phonons at frequencies ... broadening of the phonon peaks As shown in Figure 2, beside LO and TO phonon peaks, there is another phonon peak centered around 230.0 cm-1, which can be attributed to the SO phonons Such SO phonon modes ... Faucher et al [22], the reduction in physical dimension of materials can lead to a downshift of phonon frequency and a broadening of the LO phonon peak due to the strong quantum Li et al Nanoscale...

Ngày tải lên: 21/06/2014, 01:20

... transmission of semiconductor/ metal nanostructures because of the reduction of the semiconductor surface damage This FIB-milling process extends the ability of the technology to fabricate plasmonic ... from the conventional SPP Bragg scattering conditions [3] All five structures A-E exhibit similar transmission spectra with the same position of the plasmonic resonances, it can be concluded that ... low-energy ion beams Abbreviations FIB: focused ion beam; LED: light emitting diode; SEM: scanning electron microscope; SPP: surface plasmon polarition; SPPC: surface plasmon polaritonic crystal;...

Ngày tải lên: 20/06/2014, 22:20

... The use of these non-conventional carbon materials as support allowed studying the influence of support properties on the physicochemical properties of catalysts Thus, the main conclusions obtained ... pore volume of the carbon materials, which depended on the oxidation conditions [22,23,25] More severe oxidation conditions resulted in a more significant decrease of the textural properties However, ... metal–carbon interaction - The dispersion of metal particles also depends on the surface chemistry of carbon supports For the incipient wetness impregnation method, the agglomeration of platinum...

Ngày tải lên: 23/04/2014, 22:47

... observations of the (1×2) surface reconstruction on the Pt(110) plane Phys Rev Lett 1985, 55:2168-2171 20 Robinson IK, Eng PJ, Romainczyk C, Kern K: X-ray determination of the 1×3 reconstruction of ... regular unreconstructed surface, while the loose configuration as structure (a) will form the surface with (1 × 2) reconstruction Therefore, on Pt(110) surface, the (1 × 2) reconstruction has much ... equilibrium shape of the large island is strip-like in [ 10 ] direction The surface reconstruction is related to the NNN atomic interaction On Pt(110) surface, the surface is likely to reconstruct naturally...

Ngày tải lên: 18/06/2014, 22:20

... mobility and intrinsic concentration of electrons and holes, energy of excitons, phonons, and plasmons Therefore, study of nanocones’ formation mechanism and nanocones’ properties is an important ... Medvid et al.: Properties of nanocones formed on a surface of semiconductors by laser radiation: quantum confinement effect of electrons, phonons, and excitons Nanoscale Research Letters 2011 ... deformation of the top layer in the same way as in the previous case with semiconductor solid solutions 2500 Intensity, a u Appearance of nanocones on the irradiated surface of semiconductors...

Ngày tải lên: 20/06/2014, 22:20

... Benayahu, D Aronov, G Rosenman, The effect of surface treatment on the surface texture and contact angle of electrochemically deposited hydroxyapatite coating and on its interaction with bone-forming ... observe the importance of surface roughness of pipette on giga-seal formation, patch-clamp experiments were carried out using conventional and FIB-polished pipettes FIB milling of pipettes leaves ... than conventional pipettes increases the number of membrane proteins sticking to the pipette inner wall and improves the seal Conclusions In this paper, the effect of pulling parameters on the surface...

Ngày tải lên: 21/06/2014, 03:20

... are formed on the top of these surface features Figure 2d shows the situation when 1.6 ML of InAs is deposited on the surface With this amount of InAs, besides the QD formed at the top of the mounds, ... determinant in the nucleation of QD in the sidewalls of the mounds: Fig 2d, h show that after depositing 1.6 ML of InAs, QD nucleate only on one of the side walls in the case of using 25-nm thick GaAs ... layers has no influence on the optical properties of the InAs QD Conclusions On balance, we have demonstrated that after an appropriate capping of InAs QD, the resulting GaAs top surface show a characteristic...

Ngày tải lên: 22/06/2014, 00:20

... improved tool for applications, wherever modifications of the baculovirus surface properties are of importance MATERIALS AND METHODS Construction of transfer plasmids Cloning procedures were performed ... 2.0 · · · · · 107 107 107 107 107 Presentation of the ELDKWA on surface of infected cells The presentation of the inserted epitope ELDKWA on the surface of infected cells was determined by FACS ... transduction Evaluation of other peptides designed for specific functions, e.g virus targeting to selected tissues, extension of host range or enhancement of transduction efficiency of nonpermissive...

Ngày tải lên: 23/03/2014, 21:21

... improvement of properties in general and the better fitting of specific properties to defined applications is a continuous goal of polymer research Of particular interest is not only the improvement of the ... initiate epitaxial crystallization on itself The traditional view of row structures is that the nucleus is formed along and in response to the elongational component of applied stress which it helps ... availability of the monodisperse long alkanes Observations of the growth of polyethylene lamellae in row structures have made explicit the reorganization of fold surfaces implicit in kinetically controlled...

Ngày tải lên: 04/06/2014, 14:26

... the Fe3O4 concentration rises The simulated results show the same trend Conclusions In this study, different concentrations of ferro-nanofluids were applied to the magnetic cores of transformers ... compatible with the MEMS process Authors’ contributions TH performed experimental investigations of electric and magnetic properties of ferro-nanofluids on transformers and prepared the draft, PH ... Modeling and manufacturing of micromechanical RF switch with inductors Sensors 2007, 7:2660-2670 Yoon JB, Kim BI, Choi YS, Yoon E: 3-D construction of monolithic passive components for RF and microwave...

Ngày tải lên: 21/06/2014, 04:20

... the horizon, where: a – horizons composed of light formations, b – horizons composed of medium-heavy formations, c – horizon composed of heavy formations, (EUR = VEA + EA) – amount of water in ... retention of soils is of particular importance on spoil banks where only the precipitation-retention water economy exists In the studied area the horizons composed of medium heavy formations (category ... formation categories and horizons, where: a – horizons composed of light formations, b – horizons composed of medium-heavy formations, c – horizons composed of heavy formations (%) 60 Mesopores 20.90...

Ngày tải lên: 07/08/2014, 03:22

... CHARACTERIZATION OF BIOPOLYMER AND THE EFFECTS OF MECHANICAL PROPERTIES OF EXTRACELLULAR MATRIX ON CELL BEHAVIORS WONG LONG HUI (B.Eng.(Hons.), NTU) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY ... Stress Contribution by the Series Elastic Component 𝜀 𝑆𝐸𝐶 Strain Contribution by the Series Elastic Component 𝜎 𝑆𝑉𝐶 Stress Contribution by the Series Viscous Component 𝜀 𝑆𝑉𝐶 Strain Contribution by ... moduli of 40 individual NHS- and COOH- microspheres dispersed in various concentrations of collagen 87 Table 3.5: Varying concentrations of EDC and NHS used for different extent of surface...

Ngày tải lên: 09/09/2015, 11:28

... active semiconductor layer This configuration is commonly used to fabricate diagnostic OFETs to measure carrier mobility In this configuration electrons/holes are injected directly into the semiconductor/ dielectric ... the infinite dilution for each no For typical solution concentration of 10−20 mg/mL, nearly half of the chains exist in π-stack clusters (b) Dependence of ξ on volume fraction of polymer Φ Solid ... polaronic structural and electronic relaxation of the π-conjugated backbone Figure 1.2 shows the bond alternation from benzenoid to quinoid form occuring when charges are located on the backbone...

Ngày tải lên: 11/09/2015, 09:57

... result in non-selective coupling mechanisms in the presence of UV illumination On the other hand, electroreduction of aryldiazonium salts is a convenient method of functionalizing the surface with ... deposited from solution onto the metal followed by evaporation of a top contact onto the SAM at low temperature to prevent damage to the SAM The junction can measure the conduction of up to 1000 organic ... nanopore junction, NDR was observed only in functionalized OPE and was proposed to be a function of the electronic charge states of the molecule depending on the functionalization 42 Others suggested...

Ngày tải lên: 08/11/2015, 16:46

... 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), ... electron in the LUMO level The dependence of the emission spectra both on the nanocrystals size and on the impurities positions reveals once more the possibility of tuning the optical response of ... absorption and emission spectra The Si-nc excitation has been studied considering the excited state as the electronic configuration in which the HOMO contains a hole h, while the LUMO contains...

Ngày tải lên: 16/03/2014, 15:15

... Auger line of oxide interface states from the condition of the surface produced by H termination The simplest situation for the H-terminated surface would be complete passivation of surface states ... electronic properties of nanometer-scale silicon membranes in silicon -on- insulator PhD thesis University of WisconsinMadison, Physics; 2006 Boland JJ: Structure of the H-saturated Si(001) surface ... http://www.nanoscalereslett.com/content/6/1/402 situations The results confirm the extreme sensitivity of the conductance of thin semiconductor sheets to chemical changes and demonstrate how thinness plays a role In addition,...

Ngày tải lên: 21/06/2014, 03:20

... particles and the effect of decreasing size and a curvature of surface The expansion on the other hand can be due to imperfections of the lattice and the size surface effects on nanostructures More ... the contribution of tunneling effects to the properties of Au nanostructures, which cannot be omitted during electrical measurements of discontinuous metal layers Optically analyzed evolution of ... approximation is a generalization of both the Lorentz oscillator and the Lorentz-Drude models and includes the effect of the free carrier contribution to the dielectric function and resonant transitions...

Ngày tải lên: 21/06/2014, 06:20

... emission properties of Ag-TCNQ nanostructures, the morphologies characterization for those samples grown under different conditions is necessary The morphology is characterized by scanning electron ... resolution of nm) The structure of the as-grown nanostructures is by X-ray diffraction (XRD, Rigaku D/Max-3C) Field emission measurements were carried out in a parallel-plate configuration with ... smaller particles upon heating, and higher rate of diffusion dominates, the nanowires grow seemingly in succession without obvious tips on the surface In addition, the thickness of silver film greatly...

Ngày tải lên: 21/06/2014, 17:20