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The undoped and Al-doped ZnO nanostructures were fabricated on the ITO substrates pre-coated with ZnO seed layers using the hydrothermal method. The undoped well-aligned ZnO nanorods were synthesized. When introducing the Al dopant, ZnO shows various morphologies. The morphology of ZnO changes from aligned nanorods, tilted nanorods, nanotubes/nanorods to the nanosheets when the Al doping concentrations increase. The ZnO nanostructures were characterized by X-ray diffraction, field emission scanning electron microscopy, X-ray photoelectron spectroscopy, photoluminescence and Raman technology. The Al doping concentrations play an important role on the morphology and optical properties of ZnO nanostructures. The possible growth mechanism of the ZnO nanostructures was discussed.  相似文献
2.
Hydrothermal synthesis of single-crystal ZnS nanowires   总被引:1,自引:0,他引:1  
Wurtzite ZnS nanowires were prepared through a hydrothermal synthesis route with a low-temperature (180 °C) in the presence of ethylenediamine (en). The structure and morphology of the samples are studied and the growth mechanism is discussed. Room-temperature photoluminescence properties and the thermal gravimetric characteristics of the as-synthesized ZnS nanostructures are also studied. PACS 61.46.Hk; 78.67.Bf; 81.07.Vb  相似文献
3.
ZnO thin film has been deposited on the glass substrate at a temperature of 200 °C using the filtered cathodic arc plasma (FCAP) technique with the oxygen flow rate of 1.0, 3.0, 5.0, 7.0, 9.0 and 10.0 sccm. The deposition processes are only held in pure oxygen atmosphere. The as-grown films exhibit a polycrystalline hexagonal wurtzite structure. With the oxygen flow rate increase, the crystallinity of the samples first increases and then decreases as measured by X-ray diffractometry (XRD). And the tensile stress exists in all the as-grown thin films. The small grain with a mean diameter of 13 nm is observed by the field emission scanning electron microscopy (FESEM). The electrical resistivity values of the thin films are very low ranging from 5.42 × 10−3 Ω cm to 4.0 × 10−2 Ω cm. According to the result from room temperature photoluminescence spectra measurement, the luminescent bands also depend on the oxygen supply.  相似文献
4.
The Cr-Ti-N coatings with different composition were deposited in a medium frequency magnetron sputtering system on Si (1 1 1) substrates. The structures, surface morphology and wear properties were measured. The binary CrN coatings, formed a single-phase fcc structure with nearly random (1 1 1), (2 0 0) and (2 2 0) orientation, while for the Ti was introduced, coatings show a preferred orientation of (2 0 0). Cr-Ti-N coating shows a much smoother surface than CrN coating. Cr-Ti-N coating with 31.75% Ti content shows the best wear behavior. The excellent tribological properties of this composition coating are corresponding to the solid solution nitride structures.  相似文献
5.
使用介质阻挡放电光谱诊断装置,对常压介质阻挡放电在材料改性过程中的等离子体发射光谱进行测量,记录和比较了空气、氦气和氩气常压介质阻挡放电等离子体发射光谱,并运用氩元素谱线的相对强度来诊断电子温度等物理参量,以达到对材料表面改性过程的实时监控。工作的结果对常压介质阻挡放电及其在材料改性上的应用具有重要的意义  相似文献
6.
Via a specially widened anodic aluminum oxide (AAO) pore arrays, carbon nanodot arrays with uniform size and high density were obtained through filtered cathodic arc plasma (FCAP) technique. The AAO template was prepared in oxalic acid by multi-steps to get a specially enlarged opening which plays an important role in the deposition of nanodots. The morphology of the nanodots was studied by a field emission scanning electron microscopy (FESEM). The diameter of the as-prepared nanodot demonstrated here is about 100 nm at the bottom and less than 40 nm at the top, and the density was estimated to 1010 cm−2. Field emission properties of the nanodot arrays were investigated and a low threshold field of 5.1 V/μm at 10 mA/cm2 was obtained. In this paper, the carbon nanodot arrays grown as replicas of the specially widened AAO template may support a strategy to realize the fabrication of nanodot arrays with various materials.  相似文献
7.
We report the synthesis and characterization Sb-doped SnO2 nanowires by chemical vapor deposition (CVD) at 850 °C. The as-synthesized-doped nanowires showed unique periodical structures in contrast to the traditional nanowires with smooth surfaces. The fascinating structures lead to a much higher surface to volume ratio and greater changes of depletion layer volume after gas absorption, and the sensitivity of gas sensing devices may be improved by using axial periodical nanostructures, instead of ordinary one. The photoluminescence of the Sb-doped SnO2 nanostructures were measured. The doping of Sb atoms brings two new emission peaks at 561 and 670 nm.  相似文献
8.
Awl-shaped diamond-like carbon (DLC) was directly grown on anodic aluminum oxide (AAO) template by using filtered cathodic arc plasma (FCAP) technique at room temperature. The awls of DLC were about 250 nm in the height and the diameters of the awls were ∼100 nm at the top. The awl density was estimated to be ∼108 cm−2. A broad asymmetric band ranging from 1100 to 1800 cm−1 was detected by Raman spectrum. This asymmetric band was characteristic band of DLC. The sp3/(sp3+sp2) ratio of C-C bond of the awl-shaped DLC was measured by X-ray photoelectron spectrum, and it was about 68.3%. Field-emission properties of the awl-shaped DLC were investigated. A low turn-on field of 2.6 V/μm at 10 μA/cm2 with an emission area of 3.14 mm2 was achieved, and the emission current stability was very good. The results indicated that the electrons were emitted under both the effect of enhanced field because of the geometry and the work function of the DLC sample. Based on Fowler-Nordheim plot, the values of work function for the awl-shaped DLC were estimated in ranges of 0.23-1.08 from a linearity plot.  相似文献
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