期刊
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
卷 32, 期 5, 页码 6064-6079出版社
SPRINGER
DOI: 10.1007/s10854-021-05326-6
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资金
- National Natural Science Foundation of China [31560249]
- 13th five-year plan for key discipline chemistry, Xinjiang normal university
A metalloprotein-based electrode was successfully prepared using multi-wall carbon nanotubes with polypyrrole, with hemoglobin entrapment achieved via wet-coating. The direct electron transferring of the Hb-based electrode was found to be efficient, with the redox process for the heme site of Hb in coordination with Ppy being surface-controlled. However, the efficiency of Hb-induced catalysis was limited by the step of substrate diffusion.
Multi-wall carbon nanotubes (MWCNTs) with polypyrrole (Ppy) attachment were selected to play the role of supporter to accommodate hemoglobin (Hb). Metalloprotein-based electrode was prepared on the basis of MWCNTs-Ppy nano-complex with hemoglobin entrapment via conventional wet-coating. Morphology, formation parameters and physio-chemical characteristics of nano-complex with hemoglobin detainment were systematically characterized and analyzed by microscopy, spectrometry and electro-chemistry. Results from measurements and tests implied that the direct electron transferring of Hb-based electrode could be achieved with redox group in Ppy as primary electro-active site and heme sites of Hb in coordination with Ppy as intra-molecular relay. Redox process for heme site of Hb in ligation with Ppy should be attributed to a surface-controlling quasi-reversible electro-chemical reaction with 2 H+ and 2 electron involvement. Such abutting complexation would not impose considerable negative effect on the kinetics of substrate (H2O2) combination and subsequent its transformation. The efficiency of Hb-induced catalysis was limited by the step of substrate diffusion.
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