Shin Jaehyeok, Han Sangmoon, Noh Siyun, Yu Yeon-Tae, Kim Jin Soo
Department of Electronic and Information Materials Engineering, Division of Advanced Materials Engineering, and Research Center of Advanced Materials Development, Jeonbuk National University, Jeonju 54896, Republic of Korea.
Nanotechnology. 2021 Sep 21;32(50). doi: 10.1088/1361-6528/ac2427.
We report the successful demonstration of a light-assisted NOgas sensor that operates at room temperature with high response. The gas sensor was fabricated with high-crystalline undoped-GaN nanowires (NWs) and graphene functioning as the light-absorbing medium and carrier channel, respectively. Exposure of the gas sensor to the NOconcentration of 100 ppm at a light intensity of 1 mW cmof a xenon lamp delivered a response of 16% at room temperature, which increased to 23% when the light intensity increased to 100 mW cm. This value is higher than those previously reported for GaN-based NOgas sensors operating at room temperature. The room-temperature response of the gas sensor measured after six months was calculated to be 21.9%, which corresponds to 95% compared to the value obtained immediately after fabricating the devices. The response of the gas sensor after independently injecting NO, HS, H, CO, and CHCHO gases were measured to be 23, 5, 2.6, 2.2, and 1.7%, respectively. These results indicate that the gas sensor using GaN NWs and graphene provides high response, long-term stability, and good selectivity to NOgas at room temperature. In addition, the use of undoped-GaN NWs without using additional catalysts makes it possible to fabricate gas sensors that operate at room temperature simpler and better than conventional technologies.
我们报道了一种光辅助一氧化氮气体传感器的成功演示，该传感器在室温下具有高响应性。该气体传感器由高结晶度的未掺杂氮化镓纳米线（NWs）和石墨烯制成，分别用作光吸收介质和载流子通道。在氙灯光强为1 mW/cm²的条件下，将气体传感器暴露于100 ppm的一氧化氮浓度中，在室温下响应率为16%，当光强增加到100 mW/cm²时，响应率增加到23%。该值高于先前报道的在室温下工作的基于氮化镓的一氧化氮气体传感器的值。六个月后测量的气体传感器的室温响应率经计算为21.9%，与器件制造后立即获得的值相比，相当于95%。在分别注入一氧化氮、硫化氢、氢气、一氧化碳和乙醛气体后，气体传感器的响应率分别测量为23%、5%、2.6%、2.2%和1.7%。这些结果表明，使用氮化镓纳米线和石墨烯的气体传感器在室温下对一氧化氮气体具有高响应性、长期稳定性和良好的选择性。此外，使用未掺杂的氮化镓纳米线且不使用额外的催化剂使得制造在室温下工作的气体传感器比传统技术更简单、更好。
