CdO activated Sn-doped ZnO for highly sensitive, selective and stable formaldehyde sensor

被引：88

作者：

Han, Ning ^{[1
,2
]}

Wu, Xiaofeng ^{[1
]}

Zhang, Dangwen ^{[1
,2
]}

Shen, Genli ^{[1
,2
]}

Liu, Haidi ^{[1
]}

Chen, Yunfa ^{[1
]}

机构：

[1] Chinese Acad Sci, Inst Proc Engn, State Key Lab Multiphase Complex Syst, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 2011年 / 152卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Formaldehyde sensor; Sn-doped ZnO; CdO; Sensitive; Selective; Stability; GAS-SENSING PROPERTY; ZINC OXIDE; TEMPERATURE; MECHANISM; OXIDATION; CERAMICS; ETHANOL; FILMS;

D O I：

10.1016/j.snb.2010.12.029

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Sn-, Ni-, Fe- and Al-doped ZnO and pure ZnO are prepared by coprecipitation method, and characterized by scanning electron microscope (SEM), energy diffraction spectra (EDS) and X-ray diffraction (XRD). Their formaldehyde gas sensing properties are evaluated and the results show that 2.2 mol% Sn dopant can increase the response of ZnO by more than 2 folds, while other dopants increase little response or even decrease response. Further, CdO is used to activate ZnO based formaldehyde sensing material. It is demonstrated that 10 mol% CdO activated 2.2 mol% Sn-doped ZnO has the highest formaldehyde gas response, with a linear sensitivity of similar to 10/ppm at lowered work temperature of 200 degrees C than 400 degrees C of pure ZnO, and high selectivity over toluene, CO and NH3, as well as good stability tested in 1 month. (C) 2011 Published by Elsevier B.V.

引用

页码：324 / 329

页数：6