以柠檬酸为络合剂, 采用络合溶胶-凝胶法合成CuAlO2微晶. 通过TG-DTA、XRD、TEM等手段对凝胶的热分解机制、CuAlO2微晶的形成过程、微晶的物相结构、微观形貌、粒度大小等进行了研究. 结果表明: 以硝酸铜、异丙醇铝和乙二醇为反应原料, 加入柠檬酸作为络合剂, 可以与金属离子形成络合物, 从而降低了合成CuAlO2微晶的温度, 在1050℃煅烧即可得到颗粒细小、组分均匀、铜铁矿型CuAlO2微晶, 晶体粒径为150nm左右. 利用紫外-可见光谱分析, CuAlO2微晶的光学带隙约为3.75~4.05eV.络合溶胶-凝胶法制备 CuAlO2 微晶及其光学性能研究
The microcrystalline CuAlO2 was synthesized by complexing Sol-Gel method using citric acid as chelate.Thermal decomposition mechanism of the Gel, formation process of CuAlO2 microcrystallites, phase structure, microstructure, grain size, etc, were investigated by TG-DTA, XRD,TEM. Results show that using copper nitrate, aluminum isopropoxide and ethyleneglycol as raw materials, citric acid as a complexing agent complexed with metalions can reduce the synthetic temperature of microcrystalline CuAlO2.The microcrystalline delafossite-structured CuAlO2 with smallparticles, uniform composition can be obtained at 1050 ℃. Its crystal particlesize is about 150nm in diameter. UV-Visible spectral analysis shows that the optical band gap of CuAlO2 microcrystallite is about 3.75-4.05eV.
参考文献
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