Room temperature formaldehyde sensors with enhanced performance, fast response and recovery based on zinc oxide quantum dots/graphene nanocomposites
Room temperature formaldehyde sensors with enhanced performance, fast response and recovery based on zinc oxide quantum dots/graphene nanocomposites
复制标题
基于氧化锌量子点/石墨烯纳米复合材料的性能增强、快速响应和恢复的室温甲醛传感器
DOI：
10.1039/c2nr31131
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发表时间：
2012-01-01
期刊：
影响因子：
6.7
通讯作者：
Xie, Changsheng
中科院分区：
文献类型：
--
作者：
Huang, Qingwu;Zeng, Dawen;Xie, Changsheng
采用溶液法制备了氧化锌量子点修饰石墨烯纳米复合材料。ZnO量子点的尺寸约为。5 nm的纳米粒子在石墨烯模板表面成核生长，其分布密度可以通过反应时间和前驱体浓度容易地控制。ZnO量子点/石墨烯纳米复合材料在室温下的甲醛传感性能比纯石墨烯提高了4倍。此外，基于纳米复合材料的传感器具有快速响应（ca. 30秒）和恢复（ca. 40秒）的行为，优异的室温选择性和稳定性。石墨烯和ZnO量子点的协同效应是气敏增强的原因。ZnO量子点和石墨烯之间的电子转移是由于分析气体在ZnO量子点表面的氧化过程。实验结果证明了该气敏机理的正确性。ZnO量子点/石墨烯纳米复合材料传感器在监测空气污染，特别是有害和有毒的挥发性有机化合物（VOCs）方面具有潜在的应用前景。
Novel zinc oxide quantum dots (ZnO QDs) decorated graphene nanocomposites were fabricated by a facile solution-processed method. ZnO QDs with a size ca. 5 nm are nucleated and grown on the surface of the graphene template, and its distribution density can be easily controlled by the reaction time and precursor concentration. The ZnO QDs/graphene nanocomposite materials enhance formaldehyde sensing properties by 4 times compared to pure graphene at room temperature. Moreover, the sensors based on the nanocomposites have fast response (ca. 30 seconds) and recovery (ca. 40 seconds) behavior, excellent room temperature selectivity and stability. The gas sensing enhancement is attributed to the synergistic effect of graphene and ZnO QDs. The electron transfer between the ZnO QDs and the graphene is due to oxidation process of the analyzed gas on the ZnO QDs' surface. This proposed gas sensing mechanism is experimentally proved by DRIFT spectra results. The ZnO QDs/graphene nanocomposites sensors have potential applications for monitoring air pollution, especially for harmful and toxic VOCs (volatile organic compounds).