纳米SnO₂/酞菁铜薄膜材料的构筑与气敏性能研究

【作者】 赵杰；

【导师】 赵经贵；

【作者基本信息】 黑龙江大学 ， 无机化学， 2004， 硕士

【摘要】 随着环境污染问题的日益严重，人们迫切需要室温下能够检查和监测环境中各种有毒、可燃气体的敏感元件。因此对室温薄膜型气敏材料的开发和研究十分必要。本文采用分子组装技术制备了二氧化锡纳米薄膜、酞菁铜薄膜及酞菁铜／二氧化锡复合膜，利用XRD、AFM、UV-Vis、IR等测试手段对薄膜进行了较全面的结构表征，探究了薄膜结构和性能的关系，并测试了薄膜在室温下对甲醇、乙醇、正丙醇和丙酮的气敏特性。 采用溶胶—凝胶和基板提拉技术制备出高质量的纳米二氧化锡薄膜，成膜粒子均匀，大小约为9.5nm。该薄膜在室温下对醇类和丙酮均有较高的敏感性和较好的响应—恢复特性。采用旋涂技术制备了酞菁铜薄膜及其与二氧化锡复合膜，结果显示复合膜对醇类气体的气敏性有较大幅度的提高，尤其是对于正丙醇的最低检測浓度达到了4ppm。利用LB技术成功建构了酞菁铜及其与二氧化锡复合LB膜，通过偏振紫外—可见吸收光谱证明了酞菁大环分子在LB膜中呈倾斜取向，且复合LB膜对醇类有较高的灵敏度，SnO₂超微粒子的掺杂大大降低了薄膜的响应—恢复时间。更多还原

【Abstract】 It is important to study on the thin film gas-sensing materials, which used to monitor poisonous and inflammable gases at room temperature owing to seriously environmental pollution. In this paper, the thin films of tin oxide nanoparticles, copper phthalocyanine and its organic-inorganic nanocomposite were prepared by molecular assemble technique and characterized by XRD, AFM, UV-Vis and IR spectra. The gas-sensing properties of the films were investigated to methanol, ethanol, propanol and acetone at room temperature.The ordered SnOi thin films were prepared by sol-gel method and dip-coating technique. The films had good gas-sensing properties to alcohols and acetone at room temperature. The composite thin films of copper phthalocyanine embedding SnO2 nanoparticles were obtained by spin-coating and LB techniques. The gas-sensing experiments illustrated that the sensitivity of spin-coated composite films to alcohols was much higher than that of pure CuPc films, and could detect at the concentration as low as 4ppm of propanol gas. Molecular orientation of copper phthalocyanine LB films was studied by polarized UV-Vis spectra, indicating that the phthalocyanine macrocycle was arranged . The existence of the nanoparticles increased the sensitivity of the composite LB films and decreased response-recovery time to alcohols.更多还原