Normal-pressure microwave rapid synthesis of hierarchical SnO2@rGO nanostructures with superhigh surface areas as high-quality gas-sensing and electrochemical active materials

作者：Yin, Li; Chen, Deliang^*; Cui, Xue; Ge, Lianfang; Yang, Jing; Yu, Lantan; Zhang, Bing; Zhang, Rui; Shao, Guosheng

来源：Nanoscale, 2014, 6(22): 13690-13700.

DOI：10.1039/c4nr04374j

• GRAPHENE OXIDE NANOCOMPOSITES
• IN-SITU SYNTHESIS
• SNO2 NANOPARTICLES
• CONTROLLABLE SYNTHESIS
• HYDROTHERMAL METHOD
• SUPERIOR ANODE
• QUANTUM DOTS
• COMPOSITE
• PERFORMANCE
• NANOSHEETS

Hierarchical SnO2@rGO nanostructures with superhigh surface areas are synthesized via a simple redox reaction between Sn2+ ions and graphene oxide (GO) nanosheets under microwave irradiation. XRD, SEM, TEM, XPS, TG-DTA and N-2 adsorption-desorption are used to characterize the compositions and microstructures of the SnO2@rGO samples obtained. The SnO2@rGO nanostructures are used as gas-sensing and electroactive materials to evaluate their property-microstructure relationship. The results show that SnO2 nanopartictes (NPs) with particle sizes of 3-5 nm are uniformly anchored on the surfaces of reduced graphene oxide (rGO) nanosheets through a heteronucleation and growth process. The as-obtained SnO2@rGO sample with a hierarchically sesame cake-like microstructure and a superhigh specific surface area of 2110.9 m(2) g(-1) consists of 92 mass% SnO2 NPs and similar to 8 mass% rGO nanosheets. The sensitivity of the SnO2@rGO sensor upon exposure to 10 ppm H2S is up to 78 at the optimal operating temperature of 100 degrees C, and its response time is as short as 7 s. Compared with SnO2 nanocrystals (5-10 nm), the hierarchical SnO2@rGO nanostructures have enhanced gas-sensing behaviors (i.e.. high sensitivity, rapid response and good selectivity). The SnO2@rGO nanostructures also show excellent electroactivity in detecting sunset yellow (SY) in 0.1 M phosphate buffer solution (pH = 2.0). The enhancement in gas-sensing and electroactive performance is mainly attributed to the unique hierarchical microstructure, high surface areas and the synergistic effect of SnO2 NPs and rGO nanosheets.

• 出版日期2014-11
• 单位郑州航空工业管理学院; 郑州大学