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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10nm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430nm附近,逐渐红移到Au纳米粒子的等离子共振吸收峰605和880nm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515,730nm附近和550,730nm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.
Using AgNO3, HAuCl4 and tetraethyl orthosilicate as raw materials, different nAg / nAu (1: 0, 2: 1, 1: 2, 0: 1) Ag-Au alloy / SiO2 composite film.From the results of scanning electron microscopy and X-ray diffraction, it can be seen that the obtained film has good uniformity and the size of the alloy particles in the composite film is about 10 nm .Using UV- The results of spectrophotometer showed that with the decrease of nAg / nAu, the position of the absorption peak was shifted from the vicinity of 430nm of the initial resonance peak of plasma to the plasma of Au nanoparticle Resonance absorption peaks 605 and 880 nm.As can be seen from the optical absorption spectra, two samples of nAg: nAu = 2: 1 and 1: 2 showed surface plasmon resonance absorption peaks around 515, 730 nm and 550, 730 nm, respectively. -Ag alloy solid solution formation.