材料科学
氧化物
一氧化碳
工作温度
纳米线
金属
响应时间
耐久性
热的
功率(物理)
纳米技术
计算机科学
电气工程
化学
复合材料
冶金
生物化学
计算机图形学(图像)
物理
量子力学
气象学
工程类
催化作用
作者
Min‐Seung Jo,Sungho Kim,So-Yoon Park,Kwang‐Wook Choi,Sanghee Kim,Jae‐Young Yoo,Beom‐Jun Kim,Jun‐Bo Yoon
出处
期刊:ACS Sensors
[American Chemical Society]
日期:2024-04-16
标识
DOI:10.1021/acssensors.3c02613
摘要
With the escalating global awareness of air quality management, the need for continuous and reliable monitoring of toxic gases by using low-power operating systems has become increasingly important. One of which, semiconductor metal oxide gas sensors have received great attention due to their high/fast response and simple working mechanism. More specifically, self-heating metal oxide gas sensors, wherein direct thermal activation in the sensing material, have been sought for their low power-consuming characteristics. However, previous works have neglected to address the temperature distribution within the sensing material, resulting in inefficient gas response and prolonged response/recovery times, particularly due to the low-temperature regions. Here, we present a unique metal/metal oxide/metal (MMOM) nanowire architecture that conductively confines heat to the sensing material, achieving high uniformity in the temperature distribution. The proposed structure enables uniform thermal activation within the sensing material, allowing the sensor to efficiently react with the toxic gas. As a result, the proposed MMOM gas sensor showed significantly enhanced gas response (from 6.7 to 20.1% at 30 ppm), response time (from 195 to 17 s at 30 ppm), and limit of detection (∼1 ppm) when compared to those of conventional single-material structures upon exposure to carbon monoxide. Furthermore, the proposed work demonstrated low power consumption (2.36 mW) and high thermal durability (1500 on/off cycles), demonstrating its potential for practical applications in reliable and low-power operating gas sensor systems. These results propose a new paradigm for power-efficient and robust self-heating metal oxide gas sensors with potential implications for other fields requiring thermal engineering.
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