通过溶胶凝胶法制备了不同掺杂浓度的Ag/CoO纳米复合薄膜.利用DTA-TG研究了CoO干凝胶的分解温度和分解产物,初步确定了退火温度为600 ℃,气氛为N_2.X射线衍射分析表明:薄膜中存在Ag和CoO两相.在300～800 nm范围内的吸收光谱表明,Ag/CoO复合薄膜在410 nm波长左右出现显著的表面等离子共振吸收峰,并且随着Ag含量的增加,吸收峰不断增强,其吸收峰位先蓝移后红移.当Ag含量(质量分数,下同)为40%时,吸收峰最强,继续增加Ag的含量,吸收峰强度开始下降.计算光学带隙,证明并解释了吸收峰移动.
Ag-doped CoO nanocomposite films have been synthesized by Sol-Gel. DTA-TG was used to determine the decomposition temperature and decomposition product of the CoO xerogel. X-ray diffraction analysis indicated that both CoO and metal Ag phases existed. The optical absorption measured in the range of 300 to 800 nm showed that the Ag/CoO films have obvious surface plasmon resonance peak at the wavelength of around 414nm. With increasing Ag content, the absorption the intensity of the peak increases, and absorption peak blue-shifted first and then red-shifted. When Ag content is 40%, the absorption peaks show the largest intensity, then the intensity decreases. Optical band gap was calculated and explained the shifting behavior of absorption peaks.
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