Abstract
Acetone-Sensing Properties of WO3-Based Gas Sensors Operated in Dynamic Temperature Modulation Mode —Effects of Loading of Noble Metal and/or NiO onto WO3—
Highlights
ISSN 0914-4935 © MYU K.K.Sensors and Materials, Vol 28, No 11 (2016)cancer, respectively, and the development of breakthrough gas-sensing devices that can detect these gases sensitively and selectively has been expected for the early-stage detection of these diseases.Acetone is produced in exhaled breath by the fat-burning process during weight-loss diet and exercise,(12) and it is one of the representative biomarkers contained in the exhaled breath of diabetic patients.[13]
The resistance of the WO3 sensor in 20 ppm acetone balanced with dry air was smaller than that in air over the entire range of Vh (T), but the difference between the resistance in dry air and that in 20 ppm acetone balanced with dry air was much smaller than we had expected
The loading of Pt onto the WO3 increased the sensor resistance in dry air and markedly decreased the sensor resistance in 20 ppm acetone balanced with dry air, especially in the temperature range of ca. 100–200 °C
Summary
ISSN 0914-4935 © MYU K.K.Sensors and Materials, Vol 28, No 11 (2016)cancer, respectively, and the development of breakthrough gas-sensing devices that can detect these gases sensitively and selectively has been expected for the early-stage detection of these diseases.Acetone is produced in exhaled breath by the fat-burning process during weight-loss diet and exercise,(12) and it is one of the representative biomarkers contained in the exhaled breath of diabetic patients.[13]. Cancer, respectively, and the development of breakthrough gas-sensing devices that can detect these gases sensitively and selectively has been expected for the early-stage detection of these diseases. Our group has demonstrated that catalytic combustion-type gas sensors that were operated in a mode of pulsed temperature heating (typical pulsed-heating period: 400 ms for 10 s), so-called adsorption/combustion-type gas sensors, showed large dynamic responses to various types of VOCs.[35,36,37,38,39,40] In this work, we have attempted to improve the acetonesensing properties of WO3-based sensors, in wet air, by the loading of noble metal and/ or NiO onto the surface of WO3, as well as by operation in dynamic temperature modulation mode
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