Inlaid multi-walled carbon nanotube nanoelectrode arrays for electroanalysis

被引：118

作者：

Li, J ^{[1
]}

Koehne, JE ^{[1
]}

Cassell, AM ^{[1
]}

Chen, H ^{[1
]}

Ng, HT ^{[1
]}

Ye, Q ^{[1
]}

Fan, W ^{[1
]}

Han, J ^{[1
]}

Meyyappan, M ^{[1
]}

机构：

[1] NASA, Ames Res Ctr, Ctr Nanotechnol, Moffett Field, CA 94035 USA

来源：

ELECTROANALYSIS | 2005年 / 17卷 / 01期

关键词：

multi-walled carbon nanotubes; vertically aligned nanoelectrode array; chemical sensors; biosensors; DNA sensors; multiplex array; microchips;

D O I：

10.1002/elan.200403114

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The rapid development in nanomaterials and nanotechnologies has provided many new opportunities for electroanalysis. We review our recent results on the fabrication and electroanalytical applications of nanoelectrode arrays based on vertically aligned multi-walled carbon nanotubes (MWCNTs). A bottom-up approach is demonstrated, which is compatible with Si microfabrication processes. MWCNTs are encapsulated in SiO2 matrix leaving only the very end exposed to form inlaid nanoelectrode arrays. The electrical and electrochemical properties have been characterized, showing well-defined quasireversible nanoelectrode behavior. Ultrasensitive detection of small redox molecules in bulk solutions as well as immobilized at the MWCNT ends is demonstrated. A label-free affinity-based DNA sensor has shown extremely high sensitivity approaching that of fluorescence techniques. This platform can be integrated with microelectronics and microfluidics for fully automated microchips.

引用

页码：15 / 27

页数：13

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