Guangdong Provincial Key Laboratory of Optical Information Materials and Technology, Institute of Electronic Paper Displays, South China Academy of Advanced Optoelectronics, South China Normal University, Guangzhou 510006, P. R. China.
National Center for International Research on Green Optoelectronics, South China Normal University, Guangzhou 510006, P. R. China.
ACS Appl Mater Interfaces. 2023 Apr 12;15(14):18205-18216. doi: 10.1021/acsami.3c00218. Epub 2023 Mar 31.
Achieving convenient and accurate detection of indoor ppb-level formaldehyde is an urgent requirement to ensure a healthy working and living environment for people. Herein, ultrasmall InO nanorods and supramolecularly functionalized reduced graphene oxide are selected as hybrid components of visible-light-driven (VLD) heterojunctions to fabricate ppb-level formaldehyde (HCHO) gas sensors (named InAG sensors). Under 405 nm visible light illumination, the sensor exhibits an outstanding response toward ppb-level HCHO at room temperature, including the ultralow practical limit of detection (pLOD) of 5 ppb, high response (/ = 2.4, 500 ppb), relatively short response/recovery time (119 s/179 s, 500 ppb), high selectivity, and long-term stability. The ultrasensitive room temperature HCHO-sensing property is derived from visible-light-driven and large-area heterojunctions between ultrasmall InO nanorods and supramolecularly functionalized graphene nanosheets. The performance of the actual detection toward HCHO is evaluated in a 3 m test chamber, confirming the practicability and reliability of the InAG sensor. This work provides an effective strategy for the development of low-power-consumption ppb-level gas sensors.
实现室内 ppb 级甲醛的便捷、准确检测，是保障人们健康工作和生活环境的迫切需求。在此，选用了超小的 InO 纳米棒和超分子功能化还原氧化石墨烯作为可见光驱动（VLD）异质结的混合组件，来制备 ppb 级甲醛（HCHO）气体传感器（命名为 InAG 传感器）。在 405nm 可见光照射下，该传感器在室温下对 ppb 级 HCHO 表现出优异的响应，包括超低的实际检测限（pLOD）为 5ppb、高响应值（/ = 2.4，500ppb）、较短的响应/恢复时间（119s/179s，500ppb）、高选择性和长期稳定性。这种超灵敏的室温 HCHO 传感性能源自超小的 InO 纳米棒和超分子功能化石墨烯纳米片之间的可见光驱动和大面积异质结。在 3m 测试室中对 HCHO 的实际检测性能进行了评估，证实了 InAG 传感器的实用性和可靠性。这项工作为开发低功耗 ppb 级气体传感器提供了一种有效的策略。
