期刊
ELECTROCHIMICA ACTA
卷 55, 期 21, 页码 6239-6247出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2009.09.055
关键词
Chitosan; Electrochemical impedance spectroscopy; Crosslinking agents; Functionalised carbon nanotubes; Sensor and biosensor
资金
- Fundacao para a Ciencia e a Tecnologia (FCT) [PTDC/QUI/65255/2006, PTDC/QUI/65732/2006, SFRH/BPD/27075/2006, SFRH/BPD/36930/2007]
- European Community
- CEMUC(R) (Research Unit 285), Portugal
- UFSCar
- [CAPES/4383-07-9]
- Fundação para a Ciência e a Tecnologia [SFRH/BPD/36930/2007, SFRH/BPD/27075/2006] Funding Source: FCT
Graphite-epoxy resin composite (GrEC) electrodes were modified with chitosan (Chit) films and characterised using electrochemical impedance spectroscopy (EIS). Several film modifications were made using different crosslinking agents: glutaraldehyde (GA), glyoxal (GO), epichlorohydrin (ECH) and 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) together with N-hydroxysuccinimide (NHS) and the characteristics of each of them evaluated in the presence of model electroactive compounds potassium hexacyanoferrate(III) and hexaammineruthenium(III) chloride. Immobilisation of functionalised carbon nanotubes into chitosan matrices (Chit-CNT) using the same crosslinking agents was also investigated. The impedance of the electrode with the best performance (GrEC/Chit-CNT/EDC-NHS) was characterised as a sensor for dipyrone and hydroquinone and for a glucose biosensor by immobilisation of glucose oxidase (GOx) on top of Chit-CNT using GA. Modelling and equivalent circuit analysis was carried out, with emphasis on diffusion characteristics and the significant features of the spectra are discussed. (C) 2009 Elsevier Ltd. All rights reserved.
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