期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 274, 期 -, 页码 285-295出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.08.004
关键词
rGO/SnO2/PPy nanohybrid; Conducting polymer; Square wave anodic Stripping voltammetry; Limit of detection
资金
- Program for Innovative Research Team in Chinese Universities [IRT1237]
- National Natural Science Foundation of China [2167010747]
- Scientific Research Fund of Heilongjiang Provincial Education Department [D2015003, 12521421, RC2012XK018005, PEBM201502]
- Innovation and Entrepreneurship Training Project for College Students in Heilongjiang Province [201610231042]
The three dimensional (3D) interlayer rGO/SnO2/PPy nanohybrids, based on reduced graphene oxide (rGO) obtained from expanded graphene (EG), SnO2 nanoparticles (NPs) and polypyrrole (PPy) were obtained by facile method. The rGO/SnO2/PPy nanohybrid electrodes were composed of a thin conducting film of PPy on the surface of rGO/SnO2 (EG: Sn molar ratio of 1.2: 1), used for the determination of ultra-trace ions (Cd2+, Cu2+, Hg2+ and Pb2+) with the square wave anodic stripping voltammetry (SWASV) technique. Among the rGO/SnO2/PPy, rGO/SnO2 (rGS), rGO/PPy (rGP) and pure polypyrrole (PPy) samples, the sensitivity and current density of rGO/SnO2/PPy-4 (rGS: PPy mass ratio of 1: 4), have shown excellent performance for the recognition of above ultra-trace heavy metal ions (HMIs). The limit of detection (3s method) of the rGO/SnO2/PPy-4 nanohybrids modified electrode toward Cd2+, Cu2+, Hg2+ and Pb2+ ions was 7.5x10(-13), 8.3x10(-13), 8.1x10(-13) and 8.8x10(-13) mol L-1 (M), respectively. The 3D interlayer rGO/SnO2/PPy nanohybrid is a favorable material constructed for multiple functionalities having the advantages of conducting material PPy, active site SnO2 NPs and outstanding electrical substrate graphene nanosheet (obtained from EG) in electrochemical detection of HMIs.
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