Effects of Base Materials (α-Alumina and/or γ-Alumina) on Volatile Organic Compounds (VOCs)-Sensing Properties of Adsorption/Combustion-Type Microsensors

Effects of Base Materials (α-Alumina and/or γ-Alumina) on Volatile Organic Compounds (VOCs)-Sensing Properties of Adsorption/Combustion-Type Microsensors

The sensing properties of adsorption/combustion-type microsensors using 5 wt% Pt-loaded aluminas, which consist of two kinds of alumina (α-Al<sub>2</sub>O<sub>3</sub> and γ-Al<sub>2</sub>O<sub>3</sub>), as sensing (catalytic) materials for ethanol and...

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Bibliographic Details
Main Authors: Takeo Hyodo, Yuma Matsuura, Genki Inao, Takahiko Sasahara, Yasuhiro Shimizu, Taro Ueda
Format: Article
Language:English
Published: MDPI AG 2025-01-01
Series:Chemosensors
Subjects:
adsorption/combustion-type gas sensor
MEMS
dynamic response
static response
thermal conductivity
catalytic activity
Online Access:https://www.mdpi.com/2227-9040/13/1/9
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Summary:The sensing properties of adsorption/combustion-type microsensors using 5 wt% Pt-loaded aluminas, which consist of two kinds of alumina (α-Al<sub>2</sub>O<sub>3</sub> and γ-Al<sub>2</sub>O<sub>3</sub>), as sensing (catalytic) materials for ethanol and toluene, were investigated in air, and the mixing effects of α-Al<sub>2</sub>O<sub>3</sub> with γ-Al<sub>2</sub>O<sub>3</sub> on the dynamic and static responses of the sensors were discussed in this study. The mixing of 50 wt% α-Al<sub>2</sub>O<sub>3</sub> with γ-Al<sub>2</sub>O<sub>3</sub> was the most effective in enhancing the dynamic responses to ethanol, which originated from the flash combustion behavior of ethanol and/or their partially decomposed products adsorbed on the sensing films from 150 °C to 450 °C, while further mixing of α-Al<sub>2</sub>O<sub>3</sub> with γ-Al<sub>2</sub>O<sub>3</sub> tended to increase the dynamic responses to toluene. On the other hand, the static responses to both ethanol and toluene, which arise from their catalytic combustion at elevated temperatures (450 °C), mainly increased with an increase in the addition of α-Al<sub>2</sub>O<sub>3</sub> in the 5 wt% Pt-loaded aluminas. These results indicate that the synergistic effects of the catalytic activity and the thermal conductivity of the 5 wt% Pt-loaded aluminas are the most important for the sensing properties of these sensors to ethanol and toluene.
ISSN:2227-9040

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