College of Chemical Engineering, Zhejiang University of Technology , Hangzhou 310014, China.
Institute of Microanalytical System, Department of Chemistry, Zhejiang University , Hangzhou 310058, China.
ACS Appl Mater Interfaces. 2017 Oct 25;9(42):37191-37200. doi: 10.1021/acsami.7b11244. Epub 2017 Oct 13.
In order to distinguish NO and SO gas with one sensor, we designed a paper chip assembled with a 2D g-CN/rGO stacking hybrid fabricated via a layer-by-layer self-assembly approach. The g-CN/rGO hybrid exhibited a remarkable photoelectric property due to the construction of a van der Waals heterostructure. For the first time, we have been able to selectively detect NO and SO gas using a "light on and off" strategy. Under the "light off" condition, the g-CN/rGO sensor exhibited a p-type semiconducting behavior with a low detection limit of 100 ppb of NO, but with no response toward SO. In contrast, the sensor showed n-type semiconducting behavior which could detect SO at concentration as low as 2 ppm under UV light irradiation. The effective electron transfer among the 2D structure of g-CN and rGO nanosheets as well as highly porous structures could play an important role in gas sensing. The different sensing mechanisms at "light on and off" circumstances were also investigated in detail.
为了用一个传感器区分 NO 和 SO 气体，我们设计了一种纸芯片，该芯片由通过层层自组装方法制造的二维 g-CN/rGO 堆叠杂化材料组装而成。由于构建了范德华异质结构，g-CN/rGO 杂化材料表现出了显著的光电性能。我们首次能够使用“开和关”策略选择性地检测 NO 和 SO 气体。在“关”光条件下，g-CN/rGO 传感器表现出 p 型半导体行为，对 100ppb 的 NO 的检测限低，但对 SO 没有响应。相比之下，在紫外光照射下，传感器表现出 n 型半导体行为，能够检测低至 2ppm 的 SO。g-CN 的二维结构和 rGO 纳米片之间以及高度多孔结构中的有效电子转移在气体传感中可能起着重要作用。我们还详细研究了“开和关”情况下的不同传感机制。
