Na^+对WO_3气敏性能的影响  

Influence of Na^+ on the gas sensitive properties of WO_3

作　　者：娄向东[1] 彭传云[1] 吴春来[1] 安娜[1] 张冰[1] 

机构地区：[1]河南师范大学化学与环境科学学院,河南新乡453007

出　　处：《电子元件与材料》2007年第11期8-11,共4页Electronic Components And Materials

基　　金：河南省科技攻关资助项目(0524250038);河南师范大学青年科学基金资助项目

摘　　要：分别用钨酸钠或钨酸铵溶液及浓盐酸作原料,用直接沉淀法制备了含Na+和不含Na+的WO3粉体,并用XRD及粒度分布测试仪对其进行了表征。结果表明:产物分别是WO3/Na2W4O13混合氧化物及纯WO3,前者的平均粒径为4.459μm,后者为1.366μm。气敏测试结果表明:含Na+的WO3/Na2W4O13气敏元件对体积分数为50×10–6的H2S的灵敏度是164,恢复时间为35s。纯WO3气敏元件对体积分数为50×10–6的NO2及Cl2的气敏性能较好,其灵敏度分别为468与1635。Sodium tungstate, ammonium tungstate and concentrated hydrochloric acid were used to prepare WO3 powder. The micro structure and average sizes were analyzed respectively by XRD and the particle size analyzer. The results indicate that compounds were mixed oxide WO3/Na2W4O13 and pure WO3; the average sizes of mixed oxide WO3/Na2W4O13 and pure WO3 are 4.459 μm and 1.366 μm, respectively. Furthermore their gas sensing properties were tested in static state. The results show that the gas sensitivity of mixed oxide WO3/Na2W4O13 to 50×10^-6 H2S （volume fraction） is 164 and the recovery time is 35 s. The gas sensitive properties of pure WO3 to 50×10^-6 NO2 and C12 are better, their sensitivities are 468 and 1 635, respectively.

关 键 词：电子技术 WO3 NA^+ 气敏性能 H2S 

分 类 号：O611.62[理学—无机化学] O614.61[理学—化学]