Please use this identifier to cite or link to this item: http://scholarbank.nus.edu.sg/handle/10635/15046
Title: Study on oxidation and application of carbon nanotubes and enzyme based electrochemical biosensor
Authors: LIU XIAO
Keywords: Multi-walled carbon nanotubes; Electrochemical oxidation; Electric double layer capacitor; Electrocatalysis; Amperometric Genosensor; Horseradish Pero
Issue Date: 9-Dec-2005
Source: LIU XIAO (2005-12-09). Study on oxidation and application of carbon nanotubes and enzyme based electrochemical biosensor. ScholarBank@NUS Repository.
Abstract: The effect of electrochemical oxidation in 0.2 M HNO3 for multi-walled carbon nanotubes (MWNTs) on the performance of electrochemical double layer capacitors (EDLCs) was studied. SEM and TEM images reveal that electrochemical oxidation increases the specific area of MWNTs by cutting off the nanotube tips. The specific capacitance of the oxidized-MWNTs was obviously improved. Electrochemical oxidation is hence an effective way to remove the caps of MWNTs and to improve the performances of the MWNTs electrodes in EDLCs application. Comparison of the response of UA, L-AA, H2O2 on normal and oxidized MWNTs gives out clearly and directly evidence that the electrocatalytic site reside in the defect sites near the tips of MWNTs. The higher reactivity may duo to the greater strain and the presence of pentagonal rings at the tips. On the other hand a sensitive and selective enzyme-amplified based DNA sensor was developed for rapid detection of BRCA1 gene. The assay utilized a gold electrode, on which DNA probes were immobilized with the help of EDC and NHS. The hybridization signal will be amplified by HRP and be detected by electrochemical workstation. The detection limitation is 1 pM target DNA.
URI: http://scholarbank.nus.edu.sg/handle/10635/15046
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