Oxygen Sensing Properties of Strontium Titanate Ferrite Composite Films at Low Temperature

被引：3

作者：

Chow, Chee Lap ^{[1
]}

Tan, Pei Yun ^{[1
]}

Tan, Ooi Kiang ^{[1
]}

Tse, Man Siu ^{[1
]}

Ying Sin Phuan ^{[1
]}

机构：

[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore

来源：

SENSOR LETTERS | 2011年 / 9卷 / 01期

关键词：

Oxygen Sensing; Perovskite; Strontium Titanate Ferrite; High-Energy Ball Milling; PEROVSKITE-TYPE OXIDES; SOLID-SOLUTIONS; SENSORS;

D O I：

10.1166/sl.2011.1477

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

Strontium titanate ferrite solid solutions are reported as potential resistive oxygen sensors for automobile application due to its zero temperature coefficient of resistance between 700 to 900 C and strong sensitivity to oxygen partial pressure. In this contribution, the oxygen sensing properties of strontium titanate ferrite at lower temperature range (<= 450 degrees C) were characterized. SrTi0.8Fe0.2O3-delta (STF20) were synthesized and fabricated into gas sensing devices using modified sol gel composite film method. Two different synthesis methods, namely high-energy ball milling and conventional high-temperature solid state reaction, were investigated and compared. The crystal structure, microstructural properties and oxygen sensing properties of the synthesized STF20-based sensing devices were characterized using X-ray diffraction, scanning electron microscope, and gas sensing measurements. High-energy ball milled STF20 was found to be milled down to around 14 nm, which is much smaller than powders prepared by solid state reaction. High-energy ball milled STF20 device showed better sensing response to 20% oxygen with optimal relative resistance of 159 at around 300 C:. The oxygen partial pressure dependency of the conductivity was also investigated. Improved 1/m value confirmed its excellent performance as oxygen sensors due to extra oxygen defects induced by high-energy ball milling process.

引用

页码：343 / 347

页数：5

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