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.

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。