摘要
为提高LiFePO_4敏感薄膜元件的灵敏度,以铂(Pt)作为掺杂元素,用水热法一步合成出LiFe_(0.98)Pt_(0.02)PO_4粉末;利用旋涂法将其固定在锡掺杂玻璃光波导表面,制备了LiFe_(0.98)Pt_(0.02)PO_4薄膜/锡掺杂玻璃光波导元件。将敏感薄膜在不同温度下热处理,通过比较各个敏感薄膜元件对苯类挥发性有机气体的响应讨论薄膜处理温度对LiFe_(0.98)Pt_(0.02)PO_4薄膜元件光学特性及气敏性的影响。结果显示,在450℃下处理的薄膜因具有光学透明性好、折射率高、光传播损失小等特点对苯类气体显出较大的响应,能够检测出浓度为1×10^(-7)~1×10^(-3)V/V_0的二甲苯气体。当气体浓度小于1×10^(-6)V/V_0时,其他苯类气体不会对二甲苯的检测产生影响。
In order to improve the sensitivity of LiFePO_4 thin films,platinum was selected as doping element to prepare LiFe_（0.98）Pt_（0.02）PO_4 powder through hydrothermal method. LiFe_（0.98）Pt_（0.02）PO_4 thin film/tin diffused glass optical waveguide was fabricated by immobilizing the doped powder on the surface of the diffused glass using spin coating method,and was further calcinated at different temperatures. The influence of calcination temperature on the optical property and gas sensitivity of LiFe_（0.98）Pt_（0.02）PO_4 thin films was discussed by comparing the sensing performances of each film to benzene,toluene,and xylene（ BTXs）. The experimental results indicated that the LiFe_（0.98）Pt_（0.02）PO_4 thin film treated at 450℃ has the characteristics of good transparency,high refractive index,and less attenuation,showing a significant response to BTXs. Meanwhile,the sensor exhibited reversible response to the xylene in the range of 1 × 10^（-7）~ 1 × 10^（-3）V/V_0. When the gas concentration is less than 1 × 10^（-6）V/V_0,other substances did not interfere with the detection of xylene.
出处
《化学通报》
CSCD
北大核心
2017年第9期845-851,共7页
Chemistry
基金
国家自然科学基金项目(21265020)
新疆大学博士启动基金项目(209-61371)资助
