title: Dominant Factors Governing the Electron Transfer Kinetics and Electrochemical Biosensing Properties of Carbon Nanofiber Arrays.
abstract: Carbon-based electrodes have been widely used in electroanalysis for more than half a century, but the factors governing the heterogeneous electron-transfer (HET) rate are still unclear. The effects of the exposed edge plane site density, inherent resistance of the carbon electrode, and adjustable resistors on the HET kinetics of several outer- and inner-sphere redox couples including [Fe(CN)6]3-/4-, Ru(NH3)63+/2+, Fe3+/2+, dopamine, ascorbic acid, and uric acid are investigated using three kinds of carbon electrodes composed of core-shell quasi-aligned nanofiber arrays (QANFAs). The internal resistance is found to be a key factor affecting the HET kinetics and electrochemical biosensing properties. The electrodes exhibit high selectivity and sensitivity in dopamine detection in the presence of ascorbic acid and uric acid. In addition to the promising application to electrochemical biosensing, the core-shell TiC/C QANFAs encompassing a highly electroactive carbon shell and conductive TiC core provide insights into the design and construction of the ideal carbon electrode.
authors.affiliation: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology , Wuhan 430074, China.|Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University , Hung Hom, Hong Kong, China.
authors.forename: Liangsheng
authors.initials: L
authors.lastname: Hu
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong , Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Peng
authors.affiliation: Wuhan National Laboratory for Optoelectronics (WNLO) and School of Optical and Electronic Information, Huazhong University of Science and Technology , Wuhan 430074, China.
authors.forename: Kaifu
authors.initials: K
authors.lastname: Huo
authors.affiliation: The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology , Wuhan 430081, China.
authors.forename: Rongsheng
authors.initials: R
authors.lastname: Chen
authors.affiliation: The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology , Wuhan 430081, China.
authors.forename: Jijiang
authors.initials: J
authors.lastname: Fu
authors.affiliation: Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University , Hung Hom, Hong Kong, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Li
authors.affiliation: Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University , Hung Hom, Hong Kong, China.
authors.forename: Lawrence Yoon Suk
authors.initials: LYS
authors.lastname: Lee
authors.affiliation: Department of Applied Biology and Chemical Technology and the State Key Laboratory of Chirosciences, The Hong Kong Polytechnic University , Hung Hom, Hong Kong, China.
authors.forename: Kwok-Yin
authors.initials: KY
authors.lastname: Wong
authors.affiliation: Department of Physics and Materials Science, City University of Hong Kong , Tat Chee Avenue, Kowloon, Hong Kong, China.
authors.forename: Paul K
authors.initials: PK
authors.lastname: Chu
keywords: carbon electrode; core−shell nanofiber; dopamine; electrochemical biosensor; electron transfer kinetics