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Ag-Au合金/SiO2复合薄膜的制备与表征

孙小飞 魏长平 李启源

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Ag-Au合金/SiO2复合薄膜的制备与表征

孙小飞, 魏长平, 李启源

Preparation and characterization of Ag-Au alloys/SiO2 composite thin films

Sun Xiao-Fei, Wei Chang-Ping, Li Qi-Yuan
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  • 以AgNO3,HAuCl4和正硅酸乙酯为主要原料,利用溶胶-凝胶法和旋涂技术,通过热处理和紫外光辐射还原得到了不同nAg/nAu(1∶0,2∶1,1∶2,0∶1)的Ag-Au合金/SiO2复合薄膜.从扫描电子显微镜和X射线衍射谱的结果可以看出得到的薄膜均匀性好,复合薄膜中合金颗粒的尺寸为10 nm左右.利用紫外-可见分光光谱仪研究了复合薄膜的光吸收性能,结果表明,随着nAg/nAu的降低,吸收峰的位置也由最初的Ag纳米粒子的等离子共振吸收峰430 nm附近,逐渐红移到Au纳米粒子的等离子共振吸收峰605和880 nm附近.从光吸收谱可以看出,nAg∶nAu=2∶1和1∶2的两个样品分别在515,730 nm附近和550,730 nm附近出现表面等离子共振吸收峰.这表明Au-Ag合金固溶体的形成.
    Ag-Au alloys/SiO2 composite thin films (nAg/nAu=1∶0,2∶1,1∶2,0∶1) were prepared with AgNO3,HAuCl4 and tetraethyl orthosilicate by means of sol-gel method and deoxidized using ultraviolet radiation. The results of scanning electron microscope and X-ray diffraction indicate that the composite thin films are very homogeneous and the size of the nanoparticles is about 10 nm. The results of the optical absorption spectra show that, with the increasing of nAg/nAu, the absorption peaks close to 430 nm, which belongs to the surface plasmon resonance absorption peak of Ag nanoparticles, are red-shifted to the viscinity of 605 and 880 nm, which belong to the surface plasmon resonance absorption peaks of Au nanoparticles. The surface plasma resonance absorption peaks around 515 and 730, 550 and 730 nm, belong to the samples (nAg∶nAu=2∶1,1∶2),respectively,showing the formation of Ag-Au alloys dispersed in the SiO2.
    • 基金项目: 吉林省教育厅科技计划(批准号:2005-10)资助的课题.
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  • 文章访问数:  6399
  • PDF下载量:  1080
  • 被引次数: 0
出版历程
  • 收稿日期:  2008-09-17
  • 修回日期:  2008-12-30
  • 刊出日期:  2009-04-05

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