The relation among electronic structure, chemical bond and thermoelectric property of Ca3Co2O6 and Cu-doped is studied by first-principle theory. The results indicate that the highest valence band(HVB) and the lowest ...
详细信息
The MoxV3−xO7/MWNTs nanocomposites were fabricated via a hydrothermal reaction followed by self-assembling process. The nanocomposites were characterized in terms of surface morphology and structure by FESEM, TEM, XRD...
The MoxV3−xO7/MWNTs nanocomposites were fabricated via a hydrothermal reaction followed by self-assembling process. The nanocomposites were characterized in terms of surface morphology and structure by FESEM, TEM, XRD and XPS analysis, respectively. The electrochemical behaviors of the nanocomposites were investigated by galvanostatic charge-discharge test and cyclic voltammetry. The results showed that MoxV3−xO7/MWNTs nanocomposites had great cycleability as well as capacity characteristics, which was 277.4 mAh/g in the first discharge process and remained 207.9 mAh/g after fiftieth discharge cycle. In the rapid charge-discharge test, the capacity rate still remained 88.6 % after twentieth cycles at 1.2 C discharge.
The influencing factors on the workpiece quality of aluminium alloy sheet forming, such as material properties, forming condition, stress status and lubrication types were concluded. And how to improve the performance...
详细信息
Analyzed the friction mechanism and lubrication characteristics during the aluminium alloy forming process. Influence of it on the workpiece quality of aluminium alloy sheet forming was concluded. And how to improve t...
详细信息
Bulk heterojunction polymer solar cells, based on thin films of polymer/fullerene blends, have progressed rapidly during the past few years. Efficiencies over 6% have been achieved in research lab.. In this chapter, a...
详细信息
Silver nanoparticles were prepared by pulsed wire discharge (PWD) using silver wire in deionized water at various relative energy (K) from 10 to 98, which is ratio of the charged energy of the capacitor in the electri...
Silver nanoparticles were prepared by pulsed wire discharge (PWD) using silver wire in deionized water at various relative energy (K) from 10 to 98, which is ratio of the charged energy of the capacitor in the electrical circuit to the vaporization energy of the wire. From energy deposition calculated by the measured voltage and current waveforms, deposited energy of the wire was increased with increasing K. From X-ray diffraction (XRD) analysis, prepared nanoparticles were phase identified as silver. From transmission electron microscopy observations, the shape of prepared silver nanoparticles were spherical and the median particle diameter (D50) and the geometric standard deviation (σg) were calculated from the particle distribution. D50 was decreased from 34 to 19 nm with increasing K. The particle size in prepared by PWD in liquid media can be controlled by K.
A novel method based on radio frequency magnetron sputtering tailored to the deposition of low residual stress and adherent c-BN thin films on silicon substrates was developed. In this study, the effect of noble gas (...
A novel method based on radio frequency magnetron sputtering tailored to the deposition of low residual stress and adherent c-BN thin films on silicon substrates was developed. In this study, the effect of noble gas (Kr, Ar, Ne and He) added in Ar gas during sputtering on the residual stress and the c-BN content has been investigated. As a result, it was found that the residual stress of c-BN thin film decreased with increasing the helium gas flow rate within argon gas.
Cr(N,O) thin films were deposited by radio frequency reactive unbalanced magnetron sputtering on Si(100) or glassy carbon substrates. In this paper, the influence of oxygen content on hardness of Cr(N,O) thin films wa...
Cr(N,O) thin films were deposited by radio frequency reactive unbalanced magnetron sputtering on Si(100) or glassy carbon substrates. In this paper, the influence of oxygen content on hardness of Cr(N,O) thin films was investigated. The compositional analysis was carried out by Rutherford backscattering spectroscopy. It was found that these thin films contained up to 44at.% of oxygen. Phases in the samples were determined by X-ray diffraction. Cr(N,O) thin films show only peaks based on CrN. The microstructure was observed by utilizing a transmission electron microscope. At <1at.% of oxygen, crystallite size was approximately 100nm. Then, in accordance with increasing of oxygen content, crystallite size was decreased. The hardness of thin films was measured by using a nanoindenter. The micro hardness was changed with varying the oxygen content and the microstructure such as crystallite size. Thus, it was thought that the hardening on Cr(N,O) thin films was caused by solution hardening and/or Hall-Petch relationship.
A solution method was developed for fabricating ZnO nanostructures using （NH4）2CO3 as starting material SEM analysis shows that ZnO nanostructures exhibit nanorod, branch and flower-like morphologies. The crystal ph...
详细信息
A solution method was developed for fabricating ZnO nanostructures using （NH4）2CO3 as starting material SEM analysis shows that ZnO nanostructures exhibit nanorod, branch and flower-like morphologies. The crystal phase of as-synthesized products was characterized by X-ray diffraction （XRD）. The growth process, formation mechanism and optical property were also discussed by means of transmission electronic microscopy （TEM）, high resolution transmission microscopy （HRTEM） and photoluminescence （PL）. The growth direction of ZnO nanostructures was investigated based on the results of HRTEM. The PL spectrum shows two strong peaks （centered at around -387 and -470 nm） and a broad Deak （centered at around -580 nm）.
暂无评论