Glucose sensors made of novel carbon nanotube-gold nanoparticle composites

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 fa...

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Bibliographic Details
Published in:BioFactors (Oxford) 2007, Vol.30 (4), p.271-277
Main Authors: Cai, Dong, Yu, Ying, Lan, Yucheng, Dufort, Fay J., Xiong, Guangyong, Paudel, Trilochan, Ren, Zhifeng, Wagner, Dean J., Chiles, Thomas C.
Format: Article
Language:English
Subjects:
Biosensing Techniques - instrumentation
Biosensing Techniques - methods
Carbon nanotube
Electrochemistry
Glucose - analysis
glucose oxidase
Glucose Oxidase - metabolism
Gold - chemistry
Metal Nanoparticles
Microscopy, Electron, Transmission
nanoparticle
Nanotubes, Carbon
sensor
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Summary: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.
ISSN:0951-6433
1872-8081
DOI:10.1002/biof.5520300409