Optimization of Al2O3 shell thickness on SnO2 nanowires for realization of sensitive and selective H2 sensing

IF 8 1区化学 Q1 CHEMISTRY, ANALYTICAL Sensors and Actuators B: Chemical Pub Date : 2024-11-28 DOI:10.1016/j.snb.2024.137021

Eun Bi Kim, Ka Yoon Shin, Wansik Oum, Sungjoon Moon, Ali Mirzaei, Sang Sub Kim, Hyoun Woo Kim

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Abstract

Detection of highly explosive H₂ gas is a critical safety issue. Herein, using a vapor-liquid-solid growth mechanism, SnO₂ nanowires (NWs) were prepared, after which Al₂O₃ shells (1.9, 3.3, 4.5, and 6.1 nm) were deposited on synthesized SnO₂ NWs by atomic layer deposition. Based on characterization studies, C-S NW structures with a crystalline SnO₂ core and amorphous Al₂O₃ shell were successfully formed. Based on H₂ gas sensing measurement, SnO₂-Al₂O₃ (4.5 nm) C-S NWs exhibited a high response of 152.54 to H₂ (10 ppm) at 350°C. Furthermore, they showed excellent selectivity, where response to H₂ gas (10 ppm) was more than 33 times higher than that to NO₂ gas (10 ppm). Additionally, they displayed excellent repeatability as well as long-term stability in detection of low-concentration H₂ gas. The improved H₂ sensing capability was related to the high base resistance, the formation of the SnO₂-Al₂O₃ heterojunction, the optimization of the Al₂O₃ shell thickness on SnO₂ NWs, and the partial reduction of SnO₂ and Al₂O₃ in an H₂ gas atmosphere. This study sheds light on the development of H₂ sensors based on present material.

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优化二氧化锡纳米线上 Al2O3 外壳的厚度，实现灵敏的选择性 H2 传感

高爆炸性 H2 气体的检测是一个关键的安全问题。本文采用气-液-固生长机制制备了二氧化锡纳米线（NWs），然后通过原子层沉积在合成的二氧化锡纳米线上沉积了 Al2O3 外壳（1.9、3.3、4.5 和 6.1 nm）。根据表征研究，成功地形成了具有结晶 SnO2 内核和无定形 Al2O3 外壳的 C-S NW 结构。根据 H2 气体感应测量，SnO2-Al2O3（4.5 nm）C-S NW 在 350°C 时对 H2（10 ppm）的响应高达 152.54。此外，它们还表现出卓越的选择性，对 H2 气体（10 ppm）的响应比对 NO2 气体（10 ppm）的响应高 33 倍以上。此外，在检测低浓度 H2 气体时，它们还表现出优异的重复性和长期稳定性。H2 检测能力的提高与高基底电阻、SnO2-Al2O3 异质结的形成、SnO2 纳米晶上 Al2O3 壳厚度的优化以及在 H2 气体环境中 SnO2 和 Al2O3 的部分还原有关。这项研究为基于现有材料开发 H2 传感器提供了启示。

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来源期刊

Sensors and Actuators B: Chemical 工程技术-电化学

CiteScore

14.60

自引率

11.90%

发文量

1776

审稿时长

3.2 months

期刊介绍： Sensors & Actuators, B: Chemical is an international journal focused on the research and development of chemical transducers. It covers chemical sensors and biosensors, chemical actuators, and analytical microsystems. The journal is interdisciplinary, aiming to publish original works showcasing substantial advancements beyond the current state of the art in these fields, with practical applicability to solving meaningful analytical problems. Review articles are accepted by invitation from an Editor of the journal.