State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University , 2699 Qianjin Street, Changchun 130012, China.
School of Physical Science and Technology, ShanghaiTech University , Shanghai 201210, China.
ACS Appl Mater Interfaces. 2017 May 17;9(19):16335-16342. doi: 10.1021/acsami.7b04395. Epub 2017 May 5.
Nitric oxide (NO, including NO and NO) is one of the most dangerous environmental toxins and pollutants, which mainly originates from vehicle exhaust and industrial emission. The development of sensitive NO gas sensors is quite urgent for human health and the environment. Up to now, it still remains a great challenge to develop a NO gas sensor, which can satisfy multiple application demands for sensing performance (such as high response, low detection temperature, and limit). In this work, ultrathin InO nanosheets with uniform mesopores were successfully synthesized through a facile two-step synthetic method. This is a success due to not only the formation of two-dimensional (2D) nanosheets with an ultrathin thickness of 3.7 nm based on a nonlayered compound but also the template-free construction of uniform mesopores in ultrathin nanosheets. The sensors based on the as-obtained mesoporous InO ultrathin nanosheets exhibit an ultrahigh response (R/R = 213) and a short response time (ca. 4 s) toward 10 ppm NO, and a quite low detection limit (10 ppb NO) under a relatively low operating temperature (120 °C), which well satisfies multiple application demands. The excellent sensing performance should be mainly attributed to the unique structural advantages of mesopores and 2D ultrathin nanosheets.
一氧化氮（NO，包括 NO 和 NO）是最危险的环境毒素和污染物之一，主要来源于汽车尾气和工业排放。开发对人类健康和环境敏感的 NO 气体传感器非常紧迫。到目前为止，开发一种能够满足多种传感性能（如高响应、低检测温度和极限）要求的 NO 气体传感器仍然是一个巨大的挑战。在这项工作中，通过简便的两步合成方法成功合成了具有均匀介孔的超薄 InO 纳米片。这是成功的，不仅因为形成了厚度为 3.7nm 的二维（2D）纳米片，而且因为在超薄纳米片中形成了无模板的均匀介孔。基于所获得的介孔 InO 超薄纳米片的传感器对 10ppm 的 NO 表现出超高的响应（R/R = 213）和短的响应时间（约 4s），并且在相对较低的工作温度（120°C）下具有相当低的检测限（10ppb NO），这很好地满足了多种应用需求。优异的传感性能主要归因于介孔和 2D 超薄纳米片的独特结构优势。
