Ngoc Trinh Minh, Van Duy Nguyen, Hung Chu Manh, Hoa Nguyen Duc, Trung Nguyen Ngoc, Nguyen Hugo, Van Hieu Nguyen
International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology Hanoi Vietnam
School of Engineering Physics, Hanoi University of Science and Technology Hanoi Vietnam.
RSC Adv. 2018 Oct 25;8(63):36323-36330. doi: 10.1039/c8ra06061d. eCollection 2018 Oct 22.
The long duration of a working device with a limited battery capacity requires gas sensors with low power consumption. A self-heated gas sensor is a highly promising candidate to satisfy this requirement. In this study, two gas sensors with sparse and dense SnO nanowire (NW) networks were investigated under the Joule heating effect at the nanojunction. Results showed that the local heating nanojunction was effective for NO sensing but generally not for reduction gases. At 1 μW, the sparse NW sensor showed a good sensing performance to the NO gas. The dense SnO NW network required a high-power supply for gas-sensitive activation, but was suitable for reduction gases. A power of approximately 500 μW was also needed for a fast recovery time. Notably, the dense NW sensor can response to ethanol and HS gases. Results also showed that the self-heated sensors were simple in design and reproducible in terms of the fabrication process.
对于电池容量有限的工作设备而言，其长时间运行需要低功耗的气体传感器。自热式气体传感器是满足这一要求的极具潜力的候选者。在本研究中，对具有稀疏和密集SnO纳米线（NW）网络的两种气体传感器在纳米结处的焦耳热效应下进行了研究。结果表明，局部加热纳米结对NO传感有效，但通常对还原气体无效。在1 μW时，稀疏NW传感器对NO气体表现出良好的传感性能。密集的SnO NW网络需要高电源来激活气敏，但适用于还原气体。快速恢复时间也需要约500 μW的功率。值得注意的是，密集NW传感器可对乙醇和HS气体作出响应。结果还表明，自热式传感器设计简单，制造工艺具有可重复性。
