Glucose sensors made of novel carbon nanotube-gold nanoparticle composites

被引:15
作者
Cai, Dong
Yu, Ying
Lan, Yucheng
Dufort, Fay J.
Xiong, Guangyong
Paudel, Trilochan
Ren, Zhifeng
Wagner, Dean J.
Chiles, Thomas C.
机构
[1] Boston Coll, Dept Biol, Chestnut Hill, MA 02467 USA
[2] Boston Coll, Dept Phys, Chestnut Hill, MA 02467 USA
[3] USN, Hlth Res Ctr, Detachment Environm Hlth Effects Lab, Wright Patterson AFB, OH 45433 USA
[4] Huazhong Normal Univ, Inst Nanosci & Nanotechnol, Wuhan, Peoples R China
关键词
carbon nanotube; sensor; nanoparticle; glucose oxidase;
D O I
10.1002/biof.5520300409
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Carbon nanotube and metal particle composites have been exploited to fabricate high performance electrochemical devices. However, the physical and chemical procedures to synthesize the composites are labor intensive and inefficient. Our study reveals an one-step wet chemistry method to accomplish fast and controllable production of gold nanoparticle (AuNP) and carbon naotube (CNT) composites. Such a process is sensitive to the surface charge. Especially, when functionalized with carboxyl groups, the CNTs carried negative charges and showed low level association with negatively charged AuNPs. Thermal treatment was employed to decompose the carboxyl groups and render each CNT a charge-free surface thereby achieving a high level AuNP-CNT association. The fabricated glucose sensors demonstrated dependence of their sensitivities to the amount of AuNPs on the CNTs. The enhancement of sensitivity can be attributed to an accelerated electron transfer rate from glucose oxidase Gox to the electrode. The Michaelis-Menten kinetics also indicated improved performance in the glucose sensor made of AuNP-CNTs. Therefore, our research revealed a novel approach to produce metallic nanoparticle and CNT composite for fabricating high performance electrochemical sensors.
引用
收藏
页码:271 / 277
页数:7
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