期刊
NANOSCALE RESEARCH LETTERS
卷 5, 期 7, 页码 1177-1181出版社
SPRINGEROPEN
DOI: 10.1007/s11671-010-9622-1
关键词
Nanostructure; SnO2; Nanorod array; Biosensor
资金
- National Natural Science Foundation of China [50872039, 50802032]
SnO2 nanorod array grown directly on alloy substrate has been employed as the working electrode of H2O2 biosensor. Single-crystalline SnO2 nanorods provide not only low isoelectric point and enough void spaces for facile horseradish peroxidase (HRP) immobilization but also numerous conductive channels for electron transport to and from current collector; thus, leading to direct electrochemistry of HRP. The nanorod array-based biosensor demonstrates high H2O2 sensing performance in terms of excellent sensitivity (379 mu A mM(-1) cm(-2)), low detection limit (0.2 mu M) and high selectivity with the apparent Michaelis-Menten constant estimated to be as small as 33.9 mu M. Our work further demonstrates the advantages of ordered array architecture in electrochemical device application and sheds light on the construction of other high-performance enzymatic biosensors.
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