本研究以AgNO3和TEOS为原料,乙二醇独甲醚为溶剂,利用溶胶-凝胶法配制前躯体溶液,在玻璃基片上用匀胶法制备了Ag含量为50%(质量分数)的Ag纳米颗粒分散SiO2薄膜.利用X射线衍射、紫外可见分光光度计对Ag/SiO2复合薄膜的微观结构,光学吸收谱进行了表征和测试.研究了复合薄膜的制备工艺和不同热处理温度对薄膜光吸收特性的影响.DSC曲线表明热处理温度为200℃时薄膜中有Ag颗粒形成,300℃时薄膜中有机物完全分解.吸收光谱研究表明:Ag/SiO2薄膜在410~430 nm波长范围内有明显的表面等离子共振吸收峰,随着热处理温度的升高SPR吸收峰的强度增强,峰宽变窄,峰位发生蓝移.
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