NDLI: rGO/SWCNT composites as novel electrode materials for electrochemical biosensing.

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rGO/SWCNT composites as novel electrode materials for electrochemical biosensing.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Ho, Kuo-Chuan Huang, Jen-Hsien Wei, Hung-Yu Chu, Chih-Wei Huang, Tzu-Yen
Description	Country affiliation: Taiwan Author Affiliation: Huang TY ( Department of Chemical Engineering, National Taiwan University, Taipei (R.O.C.) 10617, Taiwan.)
Abstract	In this study we performed electrochemical sensing using conductive carbon composite films containing reduced graphene oxide (rGO) and single-walled carbon nanotubes (SWCNTs) as electrode modifiers on glassy carbon electrodes (GCEs). Raman spectroscopy, transmission electron microscopy, atomic force microscopy, and scanning electron microscopy all suggested that the rGO acted as a surfactant, covering and smoothing out the surface, and that the SWCNTs acted as a conducting bridge to connect the isolated rGO sheets, thereby (i) minimizing the barrier for charge transfer between the rGO sheets and (ii) increasing the conductivity of the film. We used the rGO/SWCNT-modified GCE as a sensor to analyze hydrogen peroxide (H2O2) and ß-nicotinamide adenine dinucleotide (NADH), obtaining substantial improvements in electrochemical reactivity and detection limits relative to those obtained from rGO- and SWCNT-modified electrodes, presumably because of the higher conductivity and greater coverage on the GCE, due to π-π interactions originating from the graphitic structures of the rGO and SWCNTs. The electrocatalysis response was measured by cyclic voltammetry and amperometric current-time (i-t) curve techniques. The linear concentration range of H2O2 and NADH detection at rGO/SWCNT-modified electrode is 0.5-5M and 20-400µM. The sensitivity for H2O2 and NADH detection is 2732.4 and 204µAmM(-1)cm(-2), and the limit of detection is 1.3 and 0.078µM respectively. Furthermore, interference tests indicated that the carbon composite film exhibited high selectivity toward H2O2 and NADH. Using GO as a solubilizing agent for SWCNTs establishes a new class of carbon electrodes for electrochemical sensors.
ISSN	09565663
Volume Number	43
e-ISSN	18734235
Journal	Biosensors and Bioelectronics
Language	English
Publisher	Elsevier
Publisher Date	2013-05-15
Publisher Place	Great Britain (UK)
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Biosensing Techniques Instrumentation Conductometry Electrodes Graphite Chemistry Nanotubes, Carbon Equipment Design Equipment Failure Analysis Ultrastructure Oxidation-reduction Oxides Journal Article Research Support, Non-u.s. Gov't Discipline Biotechnology
Content Type	Text
Resource Type	Article
Subject	Nanoscience and Nanotechnology Medicine Biophysics Biomedical Engineering Biotechnology Electrochemistry

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