中国物理B ›› 2002, Vol. 11 ›› Issue (12): 1307-1312.doi: 10.1088/1009-1963/11/12/317

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Fabrication and optical properties of platinum nanowire arrays on anodic aluminium oxide templates

高铁仁1, 陈子瑜1, 李发伸1, 彭勇2   

  1. (1)Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China; (2)Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China; Joule Physics Laboratory, Research Institute for Magnetic Materials, School of Sciences, the University of Salford, Manchester, M5 4WT, UK
  • 收稿日期:2002-04-17 修回日期:2002-08-12 出版日期:2002-12-12 发布日期:2005-06-12
  • 基金资助:
    Project supported by the Gansu Natural Science Foundation, the Key Teacher Foundation, and the Research Foundation for Scholars from Abroad, the latter two being from the Ministry of Education, China.

Fabrication and optical properties of platinum nanowire arrays on anodic aluminium oxide templates

Gao Tie-Ren (高铁仁)a, Chen Zi-Yu (陈子瑜)a,  Peng Yong (彭勇)ab, Li Fa-Shen (李发伸)a   

  1. a Key Laboratory for Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University, Lanzhou 730000, China; b Joule Physics Laboratory, Research Institute for Magnetic Materials, School of Sciences, the University of Salford, Manchester, M5 4WT, UK
  • Received:2002-04-17 Revised:2002-08-12 Online:2002-12-12 Published:2005-06-12
  • Supported by:
    Project supported by the Gansu Natural Science Foundation, the Key Teacher Foundation, and the Research Foundation for Scholars from Abroad, the latter two being from the Ministry of Education, China.

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摘要： Arrays of Pt nanowires, fabricated by electrodepositing Pt metal into nanoporous anodic aluminium oxide (AAO) templates, exhibit a preferable optical absorption band in the ultraviolet-visible (UV-VIS) spectra and present a blueshift as the wire aspect ratio increases or its radius decreases. This type of optical property of Pt nanowire/porous alumina composites has been theoretically explored using Maxwell－Garnett (MG) effective medium theory. The MG theory, however, is only applicable to nanowires with an infinitesimally small radius relative to the wavelength of an incident light. The nanowire radius is controlled by the pore radius of the host alumina, which depends on anodizing conditions such as the selected electrolyte, anodizing time, temperature and voltage. The nanowire aspect ratios depend on the amount of Pt deposited into the nanopores of AAO films. The optical absorption properties of the arrays of Pt nanowires with diameters of 24, 55 and 90 nm have been investigated by the UV-VIS spectra, which show that the extinction maximum (λmax) shifts to shorter wavelength side as the wire aspect ratio increases or its radius decreases. The results are qualitatively consistent with those calculated based on the MG theory.

Abstract: Arrays of Pt nanowires, fabricated by electrodepositing Pt metal into nanoporous anodic aluminium oxide (AAO) templates, exhibit a preferable optical absorption band in the ultraviolet-visible (UV-VIS) spectra and present a blueshift as the wire aspect ratio increases or its radius decreases. This type of optical property of Pt nanowire/porous alumina composites has been theoretically explored using Maxwell－Garnett (MG) effective medium theory. The MG theory, however, is only applicable to nanowires with an infinitesimally small radius relative to the wavelength of an incident light. The nanowire radius is controlled by the pore radius of the host alumina, which depends on anodizing conditions such as the selected electrolyte, anodizing time, temperature and voltage. The nanowire aspect ratios depend on the amount of Pt deposited into the nanopores of AAO films. The optical absorption properties of the arrays of Pt nanowires with diameters of 24, 55 and 90 nm have been investigated by the UV-VIS spectra, which show that the extinction maximum ($\lambda$max) shifts to shorter wavelength side as the wire aspect ratio increases or its radius decreases. The results are qualitatively consistent with those calculated based on the MG theory.

Key words: Pt nanowire arrays, Maxwell－Garnett theory, blueshift, electrodeposition

中图分类号:  (Nanocrystals, nanoparticles, and nanoclusters)

  • 78.67.Bf
81.40.Tv (Optical and dielectric properties related to treatment conditions) 81.07.-b (Nanoscale materials and structures: fabrication and characterization) 82.45.Yz (Nanostructured materials in electrochemistry) 81.16.Be (Chemical synthesis methods)