Carbon nanotubes based nanoelectrode arrays: Fabrication, evaluation, and sensing applications

Yuehe Lin, Yi Tu, Fang Lu, Wassana Yantasee, Z. F. Ren

Research output: Contribution to conferencePaper

Abstract

The fabrication, electrochemical characterization, and applications of low-site density carbon nanotube based nanoelectrode arrays (CNT-NEAs) are reported in this work. Spin-coating of an epoxy resin provides a new way to create the electrode passivation layer that effectively reduces the current leakage and eliminates the electrode capacitance by sealing the side-walls of the CNTs. The CNT-NEAs fabricated in our work effectively use the open ends of CNTs for electrochemical sensing. The open ends of the CNTs have fast electron transfer rates similar to a graphite edge-plane electrode, while the side-walls present very slow electron transfer rates similar to the graphitic basal plane. Cyclic voltammetry showed the sigmoidal shape curves with low capacitive current and scan-rate-independent limiting current. The CNT-NEAs were used successfully for voltammetric detection of trace concentrations of lead (II) at ppb level. The successful development of a glucose biosensor based on CNT-NEAs for the selective detection of glucose is also described. Glucose oxidase was covalently immobilized on the CNTs tips via carbodiimide chemistry by forming amide linkages between the amine residues and carboxylic acid groups on the open ends of CNTs. The biosensor effectively performs selective electrochemical detections of glucose in the presence of common interferences. The CNT-NEAs provide an excellent platform for ultra sensitive electrochemical sensors for chemical and biological sensing.

Original languageEnglish (US)
Pages399-409
Number of pages11
StatePublished - Dec 1 2004
EventChemical Sensors VI: Chemical and Biological Sensors and Analytical Methods - Proceedings of the International Symposium - Honolulu, HI, United States
Duration: Oct 3 2004Oct 8 2004

Other

OtherChemical Sensors VI: Chemical and Biological Sensors and Analytical Methods - Proceedings of the International Symposium
CountryUnited States
CityHonolulu, HI
Period10/3/0410/8/04

ASJC Scopus subject areas

  • Engineering(all)

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    Lin, Y., Tu, Y., Lu, F., Yantasee, W., & Ren, Z. F. (2004). Carbon nanotubes based nanoelectrode arrays: Fabrication, evaluation, and sensing applications. 399-409. Paper presented at Chemical Sensors VI: Chemical and Biological Sensors and Analytical Methods - Proceedings of the International Symposium, Honolulu, HI, United States.