Ultrafast (∼0.6 s), Robust, and Highly Linear Hydrogen Detection up to 10% Using Fully Suspended Pure Pd Nanowire

Jo, Min-Seung; Kim, Ki-Hoon; Lee, Jae-Shin; Kim, Sung-Ho; Yoo, Jae-Young; Choi, Kwang-Wook; Kim, Beom-Jun; Kwon, Dae-Sung; Yoo, Ilseon; Yang, Jae-Soon; Chung, Myung-Kun; Park, So-Yoon; Seo, Min-Ho; Yoon, Jun-Bo

doi:10.1021/acsnano.3c06806

Cited by 10 publications

(1 citation statement)

References 41 publications

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“…In terms of physical robustness, the design features of the MMOM device at the microscale allow the effects of acceleration and mechanical shock to be neglected. According to Newton’s second law ( F = ma ) where F is the force, m is the mass, and a is the acceleration, the mass of the proposed device is about 2.8 × 10 –14 kg, indicating that even at extremely high acceleration, the force is negligibly small. , …”

Section: Resultsmentioning

confidence: 99%

Fast-Response and Low-Power Self-Heating Gas Sensor Using Metal/Metal Oxide/Metal (MMOM) Structured Nanowires

Jo,

Kim,

Park

et al. 2024

ACS Sens.

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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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Section: Resultsmentioning

confidence: 99%