Co,N-doped GQDs/SnO2 mesoporous microspheres exhibit synergistically enhanced gas sensing properties for H2S gas detection
Co,N-doped GQDs/SnO2 mesoporous microspheres exhibit synergistically enhanced gas sensing properties for H2S gas detection
复制标题
Co,N 掺杂 GQDs/SnO2 介孔微球在 H2S 气体检测中表现出协同增强的气敏特性
DOI：
10.1039/d2ta00837h
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发表时间：
2022-04-07
影响因子：
11.9
通讯作者：
Quan, Hao
中科院分区：
文献类型：
--
作者：
Chen, Tingting;Sun, Jianhai;Quan, Hao
石墨烯量子点（GQDs）兼具石墨烯和半导体量子点的特性，可以分散在普通溶剂中，并与固体材料复合，是一种很有前途的新型气体传感器材料。本文以柠檬酸、尿素和氯化钴为水热源，采用溶剂热法制备了Co，N-GQD/SnO 2复合材料。在260 ℃下，对100 ppm H2S的最佳传感器响应值约为37.3，这比纯SnO 2介孔微球在312 ℃下的响应值高出2倍以上。此外，该材料具有优异的选择性、良好的再现性、快速的响应/恢复时间（5/11 s至100 ppm）和ppb级H2S检测能力（1.18至50 ppb H2S）。Co，N-GQDs/SnO 2的上级传感性能与材料表面活性位的增加和Co，N-GQDs的电调制有关。表面制造和出色的性能使我们的传感器在H2S检测方面具有很大的吸引力，并扩大了GQD的应用领域。
Graphene quantum dots (GQDs) are emerging as one of the promising candidate materials that have the properties of both graphene and semiconductor quantum dots; moreover, they can be dispersed in common solvents and compounded with solid materials for developing high-performance gas sensors. In this work, we prepared cobalt (Co) and nitrogen (N) co-doped GQD-modified SnO2 composites (Co,N-GQDs/SnO2) by a solvothermal route, in which Co,N-GQDs were prepared by using citric acid, urea and CoCl2 as the source of the hydrothermal method. The optimal sensor response value toward 100 ppm H2S is about 37.3 at 260 degrees C, which is over 2 times higher than those of pure SnO2 mesoporous microspheres at 312 degrees C. In addition, this material has excellent selectivity, good reproducibility, fast response/recovery time (5/11 s to 100 ppm), and ppb-level H2S detection ability (1.18 to 50 ppb H2S). The superior sensing performance of Co,N-GQDs/SnO2 can be attributed to the increase of active sites on the surface of the materials and the electrical modulation of Co,N-GQDs. The facial fabrication and outstanding performance make our sensors highly attractive for H2S detection and expand the application fields of GQDs.