Tin oxide and zinc oxide based doped humidity sensors

被引：71

作者：

Yawale, Shrikrishna Pandurangji ^{[1
]}

Yawale, Sangita Shrikrishna

Lamdhade, Anan Trymbakapp

机构：

[1] Govt Vidarbha Inst Sci & Humanities, Dept Phys, Amravati 444604, Maharashtra, India

[2] Arts Commerce & Sci Coll, Dept Phys, Akola 444302, Maharashtra, India

来源：

SENSORS AND ACTUATORS A-PHYSICAL | 2007年 / 135卷 / 02期

关键词：

screen-printed humidity sensor; SnO2-TiO2-Al2O3; water condensation; electron injection;

D O I：

10.1016/j.sna.2006.08.001

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

The semiconducting materials such as stannic oxide (SnO2), zinc oxide (ZnO) doped with titanium oxide (TiO2) and alpha-alumina (alpha-Al2O3), are screen-printed in the form of thick film. alpha-Al2O3 and TiO2, are used as stabilizer and temperature improvement characteristic materials. DC-electrical resistance of the films is measured in presence of humidity. SnO2-5Al(2)O(3) and ZnO-5Al(2)O(3) sensors are found to be good sensing materials for humidity. Rutile and hexagonal structures of SnO2, ZnO and alpha-Al2O3 and their nano meter grain sizes are responsible for formation of nano meter sized pores, which ultimately adsorbs water. The adsorption of water (physisorbed water) on a hydroxylated surface causes electron injection. The interaction of adsorbed oxygen with water molecules or possibly with chemisorbed water causes energy level of the adsorbed oxygen ions to fluctuate, so that electrons can be more easily injected. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：388 / 393

页数：6

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