Carbon Nanotube Nanoelectrode Array for Ultrasensitive DNA Detection

Jun Li, Hou T. Ng, Alan M. Cassell, Wendy Fan, Hua Chen, Qi Ye, Jessica E. Koehne, Jie Han, M. Meyyappan

Nano Letters · 2003 · 627 citations · 17 references

Concepts

Abstract

A nanoelectrode array based on vertically aligned multiwalled carbon nanotubes (MWNTs) embedded in SiO 2 is used for ultrasensitive DNA detection. Characteristic electrochemical behaviors are observed for measuring bulk and surface-immobilized redox species. Sensitivity is dramatically improved by lowering the nanotube density. Oligonucleotide probes are selectively functionalized to the open ends of nanotubes. The hybridization of subattomole DNA targets can be detected by combining such electrodes with Ru(bpy) 3 2+ mediated guanine oxidation.

References

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