XIANG Dong-ya| SU Zhen| ZHAO Zhuo| YANG Liu-quan| YANG Quan-hong, . Preparation of a SWCNT-DNA modified electrode and its electrochemical detection property. New Carbon Mater., 2009, 24(02): 183-186.
Citation:
XIANG Dong-ya| SU Zhen| ZHAO Zhuo| YANG Liu-quan| YANG Quan-hong, . Preparation of a SWCNT-DNA modified electrode and its electrochemical detection property. New Carbon Mater., 2009, 24(02): 183-186.
XIANG Dong-ya| SU Zhen| ZHAO Zhuo| YANG Liu-quan| YANG Quan-hong, . Preparation of a SWCNT-DNA modified electrode and its electrochemical detection property. New Carbon Mater., 2009, 24(02): 183-186.
Citation:
XIANG Dong-ya| SU Zhen| ZHAO Zhuo| YANG Liu-quan| YANG Quan-hong, . Preparation of a SWCNT-DNA modified electrode and its electrochemical detection property. New Carbon Mater., 2009, 24(02): 183-186.
School of Chemical Engineering and Technology, Tianjin University|Tianjin 300072|China|
Funds:
Program for New Century Excellent Talents in University (NCET07-0607; Ministry of Education, China), National Natural Science Foundation of China (50842060), NSF of Tianjin (07JCYBJC 15200) and the Foundation of State Key Laboratory of Coal Conversion (08-913).
SWCNT-DNA hybrids were prepared by a selfassembly process of SWCNTs and single strand DNA (ssDNA) and all nanotubes were isolated into individual nanotubes in these hybrids. The SWCNT-DNA hybrids attach strongly to a glassy carbon (GC) electrode surface and easily form a uniform film, to produce a SWCNT-DNA modified electrode. Compared with unmodified and bundled SWCNT modified GC electrodes, the SWCNT-DNA modified one shows strong current signals responding to a K3Fe(CN)6 solution in the cyclic voltammetric analysis. Moreover, such electrochemical signals are stable, and of high sensitivity and respond to the concentration of K3Fe(CN)6 solution in a linear relationship. In the SWCNT-DNA modified electrode, the wrapping of ssDNA around the SWCNT increases the specific surface area and enhances electron transfer in the Fe(CN)3-6/ Fe(CN)4- 6system, indicating that this novel electrode could be a promising candidate for electrochemical detection.