聚乙烯醇分散对LiFePO_4薄膜气敏性的影响  

The Impact of Polyvinyl Alcohol Dispersion of LiFePO_4 Gas Sensing Properties thin Film

作　　者：帕提曼.尼扎木丁 阿布力孜.伊米提[1] PATIMA Nizamidin ABLIZ Yimit(College of Chemistry and Chemical Engineering, Xinjiang University, Urumqi 830046, Chin)

机构地区：[1]新疆大学化学化工学院,新疆乌鲁木齐830046

出　　处：《郑州大学学报（工学版）》2017年第1期92-96,共5页Journal of Zhengzhou University（Engineering Science）

基　　金：国家自然科学基金资助项目(21265020);新疆大学博士启动基金资助项目(209-61371)

摘　　要：为了优化LiFePO_4薄膜制备条件,提高LiFePO_4薄膜气敏元件的灵敏度,用水热法合成LiFePO_4并把它分散在聚乙烯醇(PVA)当中.利用旋转-甩涂法将LiFePO_4-PVA分散溶液涂抹于锡掺杂玻璃光波导表面,研制出LiFePO_4薄膜/锡掺杂玻璃光波导敏感元件;利用平面光波导检测系统对其气敏性进行研究.研究结果表明,分散剂质量分数为2%,超声波振荡时间为2 h,分散温度为25℃时,所制备出的敏感元件对二甲苯等苯类气体显出良好的气敏特性,其对二甲苯体积分数的检测范围为1×10^(-8)~1×10^(-3),分散之后,敏感元件对二甲苯等气体的检测灵敏度有所提高.In this paper,in order to optimize the preparation conditions and to improve the sensitivity of LiFePO4 thin film gas sensor,the LiFePO4 was synthesized by hydrothermal method and dispersed in polyvinyl alcohol（PVA）. The PVA dispersed LiFePO4 thin film/tin-diffused glass optical waveguide sensing element was fabricated via spin-coating a LiFePO4-PVA dispersion solution onto the surface of tin diffused glass optical waveguide; In the end,the gas sensing properties was monitored using the planar optical waveguide detection system. The testing results indicated that,the best condition for fabrication of sensing film was： the dispersant concentration was of 2wt. %,the ultrasonic vibration time was 2 h,dispersion temperature was 25 ℃,and the corresponding sensing element exhibited good responsible to BTXs（benzene,toluene,xylene）. The detection limits for the PVA dispersed LiFePO4 thin film/tin-diffused glass optical waveguide sensor was 1 ×10^-8-1×10^-3. After the dispersion,the sensitivity was increased.

关 键 词：光波导气敏元件 分散剂 LiFePO4薄膜 气敏性 

分 类 号：O657.3[理学—分析化学]