聚噻吩/WO_3复合纳米材料的制备及气敏性能  

Preparation and gas sensing property of polythiophene/WO_3 nanocomposites

作　　者：桂阳海[1,2] 崔瑞立[1,2] 莫元妙[1] 牛连杰[1] 

机构地区：[1]郑州轻工业学院河南省表界面科学重点实验室,河南郑州450002 [2]郑州轻工业学院功能材料研究所,河南郑州450002

出　　处：《电子元件与材料》2010年第5期32-34,40,共4页Electronic Components And Materials

基　　金：河南省教育厅自然科学基金资助项目(No2010A430021);郑州市科技攻关项目(No083SGYG23143-1);郑州轻工业学院博士启动基金资助项目(No2008BSJJ012)

摘　　要：采用水合肼法制备WO3粉体,再以无水FeCl3作氧化剂,通过原位化学氧化聚合制备了不同聚噻吩(PTh)掺杂量的PTh/WO3复合纳米材料。并研究了用其制备的气敏元件的气敏性能。结果表明:气敏元件对H2S和NOx有较高的灵敏度和较好的选择性。用质量分数w(PTh)为5%的PTh/WO3复合纳米材料制备的气敏元件,在加热电压为2.25V时,对体积分数φ(NOx)为5×10–6的灵敏度可达77.14;用w(PTh)为20%的PTh/WO3复合纳米材料所制之气敏元件,在加热电压为2.43V时,对φ(H2S)为20×10–6的灵敏度达63.27。WO3 powder was prepared by the reduction method with hydrazine hydrate, and nanocomposites of polythiophene（PTh）/WO3 with different mass fraction of PTh were fabricated via the in situ chemical oxidative polymerization with anhydrous ferric chloride （FeCl3） as an oxidant. The gas sensing properties of the gas sensors based on the nanocomposites were studied. The results show that the gas sensors have higher sensitivity and better selectivity to H2S and NOx. The sensitivity of the gas sensor prepared with PTh/WO3 nanocomposites is 77.14 to 5× 10^-6NOx （volume fraction） when w（PTh） is 5% and heating voltage is 2.25 V. The sensitivity of the gas sensor fabricated with PTh/WO3 composites is 63.27 to 20× 10^4 H2S （volume fraction） when w（PTh） is 20% and heating voltage is 2.43 V.

关 键 词：WO3 聚噻吩 原位化学氧化聚合 气敏元件 气敏性能 

分 类 号：TP212.2[自动化与计算机技术—检测技术与自动化装置] TQ174.75[自动化与计算机技术—控制科学与工程]