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Morphology control of aluminum nitride (AlN) for a novel high-temperature hydrogen sensor
International Journal of Minerals, Metallurgy and Materials ( IF 5.6 ) Pub Date : 2020-10-21 , DOI: 10.1007/s12613-020-2143-8
Angga Hermawan , Yusuke Asakura , Shu Yin

Hydrogen is a promising renewable energy source for fossil-free transportation and electrical energy generation. However, leaking hydrogen in high-temperature production processes can cause an explosion, which endangers production workers and surrounding areas. To detect leaks early, we used a sensor material based on a wide bandgap aluminum nitride (AlN) that can withstand a high-temperature environment. Three unique AlN morphologies (rod-like, nest-like, and hexagonal plate-like) were synthesized by a direct nitridation method at 1400°C using γ-AlOOH as a precursor. The gas-sensing performance shows that a hexagonal plate-like morphology exhibited p-type sensing behavior and showed good repeatability as well as the highest response (S = 58.7) toward a 750 ppm leak of H2 gas at high temperature (500°C) compared with the rod-like and nest-like morphologies. Furthermore, the hexagonal plate-like morphology showed fast response and recovery times of 40 and 82 s, respectively. The surface facet of the hexagonal morphology of AlN might be energetically favorable for gas adsorption-desorption for enhanced hydrogen detection.



中文翻译:

新型高温氢传感器的氮化铝(AlN)的形貌控制

氢气是用于无化石运输和发电的有希望的可再生能源。但是,高温生产过程中泄漏的氢气会引起爆炸,从而危及生产工人和周围地区。为了尽早发现泄漏,我们使用了基于宽带隙氮化铝(AlN)的传感器材料,该材料可以承受高温环境。以γ-AlOOH为前驱体,在1400℃下通过直接氮化法合成了三种独特的AlN形态(棒状,巢状和六角板状)。气体感测性能表明,六角形板状形态表现出p型感测行为,并显示出良好的可重复性以及对750 ppm H 2泄漏的最高响应(S = 58.7)与棒状和巢状形态相比,气体在高温(500°C)时更易燃烧。此外,六角形板状形态显示出快速响应和恢复时间,分别为40和82 s。AlN的六边形形态的表面在能量上有利于气体吸附-解吸,以增强氢气检测。

更新日期:2020-10-20
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