TY - JOUR
T1 - Dominant Factors Governing the Electron Transfer Kinetics and Electrochemical Biosensing Properties of Carbon Nanofiber Arrays
AU - Hu, Liangsheng
AU - Peng, Xiang
AU - Huo, Kaifu
AU - Chen, Rongsheng
AU - Fu, Jijiang
AU - Li, Yong
AU - Lee, Yoon Suk
AU - Wong, Kwok Yin
AU - Chu, Paul K.
PY - 2016/10/26
Y1 - 2016/10/26
N2 - 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.
AB - 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.
KW - carbon electrode
KW - core-shell nanofiber
KW - dopamine
KW - electrochemical biosensor
KW - electron transfer kinetics
UR - http://www.scopus.com/inward/record.url?scp=84993977975&partnerID=8YFLogxK
U2 - 10.1021/acsami.6b10100
DO - 10.1021/acsami.6b10100
M3 - Journal article
SN - 1944-8244
VL - 8
SP - 28872
EP - 28879
JO - ACS Applied Materials and Interfaces
JF - ACS Applied Materials and Interfaces
IS - 42
ER -