NiO-WO3纳米立方块的制备及在甲醛检测中的应用  

Synthesis of NiO-WO3 Nanocubes and Their Application in Detecting Formaldehyde

作　　者：伞晓广[1] 巩晓辉 陆一鸣 乔桐桐 游宇 孟丹[1] SAN Xiaoguang;GONG Xiaohui;LU Yiming;QIAO Tongtong;YOU Yu;MENG Dan(Shenyang University of Chemical Technology,Shenyang 110142,China)

机构地区：[1]沈阳化工大学化工学院,沈阳110142

出　　处：《应用化学》2020年第10期1203-1210,共8页Chinese Journal of Applied Chemistry

基　　金：国家自然科学基金(61973223);辽宁省自然科学基金(2019-ZD-0072)资助。

摘　　要：采用一步水热合成法合成NiO-WO 3纳米立方块,以WO 3为主体,引入p型半导体NiO构建NiO-WO 3 p-n异质结。通过扫描电子显微镜(SEM)和X射线衍射仪(XRD)对相应的微观结构进行了分析表征,表明产物为单斜相WO 3,由尺寸大小均匀的纳米立方块组成,平均粒径100 nm左右,引入NiO后WO 3纳米立方块的形貌基本保持不变。将NiO-WO 3纳米立方块制成气敏元件并测验了其对甲醛气体的敏感特性。气敏测试结果表明,构建NiO-WO 3异质结可显著地提高WO 3传感器对甲醛气体的敏感特性。特别是5%NiO-WO 3异质结纳米立方块结构传感器,其在200℃下对0.134 mg/L甲醛的灵敏度达到18.5,且具有快速响应-恢复特性、良好的稳定性及对甲醛的良好选择性。传感器性能提升的原因主是界面处p-n异质结的形成和NiO的高催化活性。The NiO-WO 3 nanocubes are synthesized by hydrothermal synthesis.The p-n junction is formed by introducing p-type NiO to WO 3 nanocubes.The products are characterized by XRD and SEM and have cube-like structures which are successfully retained after introducing NiO.The formaldehyde gas sensing properties are systematically investigated between the pure and NiO-WO 3 nanocubes.The NiO-WO 3 nanocube sensor exhibits enhanced response and lower operating temperature compared to the pure one.Especially,the 5%molar fraction of NiO-WO 3 nanocube sensor exhibits the excellent sensing properties.Its highest response to 0.134 mg/L formaldehyde gas is 18.5 at 200℃.In addition,fast response and recovery,good reproducibility and stability,and good selectivity to formaldehyde are also obtained,indicating the formation of NiO-WO 3 heterojunction in favor of improving the sensing properties.Meanwhile,the sensing enhancement mechanism of the NiO-WO 3 nanocubes is also discussed,which is related to the formation of hetrojunction at interface and the high catalytic activity of NiO.

关 键 词：NiO-WO 3 纳米立方块 甲醛检测 

分 类 号：O614.8[理学—无机化学]