Formaldehyde sensor based on Ni-doped tetrapod-shaped ZnO nanopowder induced by external magnetic field

被引：39

作者：

Bai, Zikui ^{[1
]}

Xie, Changsheng ^{[1
,2
]}

Hu, Mulin ^{[2
]}

Zhang, Shunping ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China

[2] Huazhong Univ Sci & Technol, Dept Mat Sci & Engn, Nanomat & Smart Sensor Res Lab, Wuhan 430074, Peoples R China

来源：

PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES | 2008年 / 41卷 / 02期

关键词：

Formaldehyde sensor; NiO; Tetrapod-shaped ZnO nanopowder; External magnetic held;

D O I：

10.1016/j.physe.2008.07.019

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The sensors based on Ni-doped ZnO nanopowder with tetrapod-shape (T-ZnO) were fabricated by screen-printing technique with external magnetic field in different direction. The morphologies and crystal structures of the thick film were characterized by X-ray diffraction (XRD) and field-emission scanning electron microscopy (FE-SEM), respectively. Gas-sensing property of sensors responded to 100 ppm formaldehyde was also detected. The results Show that the direction of magnetic field has crucial effect on the sensor sensitivity. The sensors based on 5 wt% Ni-doped T-ZnO induced by magnetic field in parallel direction to the thick film surface, has the optimization sensitivity, the shortest response and recovery time, which are 10.6, 16 and 15 s, respectively. The magnetic-field induction model and the gas-sensing mechanism of the Ni-doped T-ZnO are proposed. (C) 2008 Published by Elsevier B.V.

引用

页码：235 / 239

页数：5

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