Gong Yelei, Li Hao, Pei Wenle, Fan Jincheng, Umar Ahmad, Al-Assiri M S, Wang Yao, Frans de Rooij Nicolaas, Zhou Guofu
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
Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry, Beihang University Beijing 100191 P. R. China.
RSC Adv. 2019 Sep 25;9(52):30432-30438. doi: 10.1039/c9ra05706d. eCollection 2019 Sep 23.
In this study, a graphene-based composite 4HQ-rGO/Cu was prepared the supramolecular assembly of graphene nanosheets with 4-hydroxyquinoline (4HQ) and copper(ii) ions. The as-prepared supramolecular assembly exhibited an excellent and enhanced sensing performance towards acetic acid at room-temperature, which was due to the fact that the D-π-A molecules, 4HQ, were able to accelerate the charge transfer between the graphene nanosheets and 4HQ molecules when acetic acid was attached. In addition, at room temperature, the copper(ii) ions also played a critical role as the main active site for gas adsorption, and thus the as-fabricated sensor exhibited a high response, outstanding selectivity, and ultra-fast response/recovery time. To examine the selectivity of the Cu ions for the supramolecular assembly, various other transition metal ions such as Mn, Fe, Co, Ni, Cu, and Cd were attached to the 4HQ-rGO assembly, and their acetic sensing performance was determined. Interestingly, the supramolecular assembly with the Cu ions (4HQ-rGO/Cu) exhibited the best sensing performance compared to other metal ion-based 4HQ-rGO materials. Compared with the typical acetic acid gas sensors reported in the literature, it is noteworthy to mention that the as-prepared 4HQ-rGO/Cu supramolecular assembly exhibited the shortest gas response time (within 5 s) at room temperature. The presented study demonstrates that the as-prepared supramolecular assembly is a promising material as a room temperature acetic acid gas sensor in practical applications.
在本研究中，通过石墨烯纳米片与4-羟基喹啉（4HQ）和铜（II）离子的超分子组装制备了一种基于石墨烯的复合材料4HQ-rGO/Cu。所制备的超分子组装体在室温下对乙酸表现出优异且增强的传感性能，这是因为当乙酸附着时，D-π-A分子4HQ能够加速石墨烯纳米片与4HQ分子之间的电荷转移。此外，在室温下，铜（II）离子作为气体吸附的主要活性位点也起着关键作用，因此所制备的传感器表现出高响应、出色的选择性以及超快的响应/恢复时间。为了研究铜离子对超分子组装体的选择性，将各种其他过渡金属离子如锰、铁、钴、镍、铜和镉附着到4HQ-rGO组装体上，并测定它们对乙酸的传感性能。有趣的是，与其他基于金属离子的4HQ-rGO材料相比，含有铜离子的超分子组装体（4HQ-rGO/Cu）表现出最佳的传感性能。值得一提的是，与文献中报道的典型乙酸气体传感器相比，所制备的4HQ-rGO/Cu超分子组装体在室温下表现出最短的气体响应时间（在5秒内）。本研究表明，所制备的超分子组装体在实际应用中作为室温乙酸气体传感器是一种有前途的材料。
