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采用多孔阳极氧化铝模板(AAO)结合直流电化学沉积法, 通过一种新的两步法合成一维铜(核)-镍(壳)纳米结构. 首先制备铜纳米线, 然后对AAO进行扩孔, 利用铜纳米线和AAO孔壁之间的间隙,沉积镍纳米线/纳米管. 通过X射线衍射仪(XRD)、扫描电子显微镜(SEM)和透射电子显微镜(TEM)对其结构和形貌进行表征分析, 所得结果验证了这种方法的可行性. 以腺嘌呤为探针分子研究此种纳米结构的表面增强拉曼散射(SERS)效应, 结果表明, 这种一维纳米材料是一种潜在的SERS活性基底, 拓宽了过渡金属在SERS中的应用. 相似文献
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Forward and reverse electron transport properties across a CdS/Si multi-interface nanoheterojunction 下载免费PDF全文
The electron transport behavior across the interface plays an important role in determining the performance of op- toelectronic devices based on heterojunctions. Here through growing CdS thin film on silicon nanoporous pillar array, an untraditional, nonplanar, and multi-interface CdS/Si nanoheterojunction is prepared. The current density versus voltage curve is measured and an obvious rectification effect is observed. Based on the fitting results and model analyses on the forward and reverse conduction characteristics, the electron transport mechanism under low forward bias, high forward bias, and reverse bias are attributed to the Ohmic regime, space-charge-limited current regime, and modified Poole-Frenkel regime respectively. The forward and reverse electrical behaviors are found to be highly related to the distribution of inter- facial trap states and the existence of localized electric field respectively. These results might be helpful for optimizing the preparing procedures to realize high-performance silicon-based CdS optoelectronic devices. 相似文献
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This paper reports that the YBa2Cu3-xZnxO7-δ (x = 0-0.4) samples are researched by means of x-ray diffraction, calculations of binding energy, the positron experiments and variations of oxygen content. The results of simulated calculations, positron experiments and variations of oxygen content support the existence of cluster effect. Moreover, it is concluded that the cluster effect is an important factor on suppression of high-Tc cuprate superconductivity and the Tc does not depend on the density of valence electron directly. 相似文献
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