期刊
BIOELECTROCHEMISTRY
卷 123, 期 -, 页码 103-111出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.bioelechem.2018.05.001
关键词
Graphene-carbon spheres; Polymer dyes; Ag nanocrystals; Live cellular tracking; Nonenzymatic H2O2 sensor
资金
- Shanxi Province Science Foundation for Youths [201601D202023]
- Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi Province, China [2016167]
- Taiyuan Normal University [I170126]
We describe a facile method to synthesize a new type of catalyst by electrodepositing Ag nanocrystals (AgNCs) on the different polymer dyes, Poly (methylene blue) (PMB) or Poly (4-(2-Pyridylazo)-Resorcinol) (PAR) modified graphene carbon spheres (GS) hybrids. The self-assembled GS take dual advantages of carbon spheres and graphene. Carbon spheres acts as nano-spacers prevent the aggregation of graphene and guarantee the fast electron transfer of GS. Secondly, polymerized dyes used here are beneficial for AgNCs growing as a linker. The effects of dyes on the growth habits, morphologies and catalytic properties for AgNCs were investigated. A novel electrochemical nonenzymatic sensor for hydrogen peroxide (H2O2) detection is fabricated based on the Ag/Polymer dyes/GS ternary composites modified glass carbon electrode (GCE) for the first time. It was found that the proposed electrodes, especially for Ag/PMB/GS/GCE, displayed a peculiar electrocatalytic activity towards H2O2 reduction synergistically as compared to Ag/PAR/GS/GCE or Ag/GS/GCE alone. Ag/PMB/GS/GCE showed a linear response over the H2O2 concentration range of 0.5 to 1112 mu M. The detection limit and sensitivity is 0.15 mu M and 400 mu A mM(-1) cm(-2), respectively. These outstanding results enable the practical application of Ag/PMB/GS/GCE for the H2O2 tracking released from MCF-7 (human breast cancer cells) with satisfactory results. (C) 2018 Elsevier B.V. All rights reserved.
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