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1.
Single-crystalline bismuth nanowire arrays with different diameters were fabricated within porous anodic alumina membranes with the same pore size using the pulsed electro-deposition technique. X-ray diffraction measurements show that the as-synthesized nanowires have a highly preferential orientation. Scanning electron microscopy, transmission electron microscopy and high-resolution transmission electron microscopy analyses indicate that bismuth nanowire arrays are high filling, ordered and single-crystalline. Electrical resistance measurements show that the bismuth nanowires have a metal-semiconductor transition when the diameters decrease from 90 to 50 nm, and the resistance behaviors are explained on the basis of the quantum confinement effect and Matthiessen’s rule.  相似文献
2.
Laser morphological manipulation has been performed on gold nanoparticles periodically arranged on solid supports by nanosphere lithography. It is shown that third harmonic Nd:YAG pulse laser irradiation (15 mJ/cm2 per pulse) leads to an evolution from the initial polycrystalline, triangular shaped particles to spherical single crystalline particles. These morphological changes are accompanied by a significant change in the optical absorption properties of the array. This study demonstrates that laser irradiation is an excellent technique to control the properties of nanostructured materials on solid supports. Further, it is suggested that the selected area treatment possible with the laser is a valuable new technique for designing functional nanomaterials for applications such as high-density data storage devices. PACS 61.46.+w; 42.79.Vb; 52.38.Bv; 78.67.Hc  相似文献
3.
Tantalum oxide (Ta2O5) is one of the most studied materials for its stable resistance switching and potential application in nonvolatile memory devices. Top electrode and essential switching material are two critical points dominating its switching characteristics. Here, Ta2O5 films of amorphous nature (a-Ta2O5) with tunable thicknesses were made by changing the applied voltage during anodic oxidation of Ta-metal foils. The resistance-switching behavior of an a-Ta2O5 film in a metal/a-Ta2O5/Ta configuration was investigated by using a sputtered W or Ag metal film as the top electrode. The unipolar threshold switching phenomenon was observed using W as top electrode (WTE), while bipolar switching behaviors were achieved using active Ag metal as top electrode (AgTE). The thickness of the a-Ta2O5 film shows an obvious effect on the SET voltage in a WTE/a-Ta2O5/Ta device. The interfacial redox reaction induced formation of more conductive Ta-rich suboxide and the Joule heating effect are proposed to contribute to the unipolar threshold switching behavior. It is also suggested that the bipolar switching could have resulted from the electrochemical reaction-induced dissolution and growth of Ag conducting channels inside the Ta2O5 films.  相似文献
4.
采用电沉积及后续的热处理技术,在Ti衬底上合成了一种三维多孔花状ZnO微纳结构薄膜. 这种ZnO结构是由包含大量纳米颗粒和孔洞的纳米薄片组成,纳米颗粒的大小可以通过调节电沉积时间和煅烧温度控制. 光催化性能的测试表明这种多孔ZnO薄膜是一种理想的光催化剂.  相似文献
5.
盛翠翠  蔡云雨  代恩梅  梁长浩 《中国物理 B》2012,21(8):88101-088101
Tantalum(Ta) oxide films with tunable structural color were fabricated easily using anodic oxidation.The structure,components,and surface valence states of the oxide films were investigated by using gazing incidence X-ray diffractometry,X-ray photoelectron microscopy,and surface analytical techniques.Their thickness and optical properties were studied by using spectroscopic ellipsometry and total reflectance spectrum.Color was accurately defined using L*a*b* scale.The thickness of compact Ta2O5 films was linearly dependent on anodizing voltage.The film color was tunable by adjusting the anodic voltage.The difference in color appearance resulted from the interference behavior between the interfaces of air-oxide and oxide-metal.  相似文献
6.
Urchin-like Co3O4 hierarchical micro/nanostructures have been successfully synthesized by calcining urchin-like precursor CoCO3, which are prepared by a facile hydrothermal route. The particle size of the urchin-like Co3O4 could be easily controlled by altering the calcination temperature. The morphology and structure of the as-prepared urchin-like products were characterized by XRD, FESEM and TEM. Photocatalytic measurement demonstrates that these urchin-like Co3O4 micro/nanostructures show good photocatalytic effect and their degradation efficiency is strongly dependent on their particle size. Furthermore, a plausible reaction mechanism is also proposed to illustrate the photocatalytic processes of Co3O4.  相似文献
7.
In this paper we report the structure and magnetic properties of flower-like α-NiS nanostructure prepared by a facile one-step hydrothermal method. The flowers consist of polycrystalline nanoflakes, and the nanoflakes are composed of single crystalline nanocrystals with an average size of about 15 nm. The α-NiS flowers exhibit the transition from paramagnetism to ferromagnetism with the blocking temperature of about 12 K. The field dependences of the magnetization prove that these flowers demonstrate a coexistence of antiferromagnetism and ferromagnetism at 5 K, and exhibit a strong paramagnetic response at temperature higher than 100 K.  相似文献
8.
水热法制备的合成海胆状Co3O4前驱物在空气中退火得到三维海胆状Co3O4的微纳结构. 采用FESEM、TEM、HRTEM以及XRD对产物进行形貌和结构的表征. 结果表明,合成的海胆状结构Co3O4由许多粒径约为15 nm的颗粒串接形成. 锂电池测试性能表明,制备的海胆状Co3O4首次放电容量达到1.369 Ah/g,经过20次循环  相似文献
9.
通过脉冲电沉积,外延生长出小单元长度的Bi2Te3/Sb超晶格纳米线.借助哈曼方法,测量了超晶格纳米线阵列的热电性能,330 K时的ZT值可达0.15.研究了Bi2Te3/Sb超晶格纳米线阵列器件的制冷或者加热能力,发现器件的上下表面的最大温差可以达到6.6 K.  相似文献
10.
本文采用二维有限元方法,研究了由非对称半径及间距组成的银纳米线三聚体的等离子体共振以及异常的电场分布现象. 模拟结果显示,非对称银纳米线三聚体中存在亮模和暗模. 当亮模分布于两根半径较小的纳米线之间时,会导致在较大半径的两根纳米线间出现较高的场增强分布,说明级联效应被抑制. 相反,当两根半径较小的纳米线之间存在暗模时,较大的场增强存在于两根较小半径的纳米线间,此时所产生的级联效应得以实现.  相似文献
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