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Vol. 146, No. 11, November 2012, pp. 69-77

 

Bullet

 

Electrostatically Functionalized Multi-Walled Carbon Nanotubes Based Flexible and Non-Enzymatic Biosensor
for Glucose Detection
 

1 Bhawana Singh, 1,* Vasuda Bhatia, 1 V. K. Jain

1 Amity Institute of Advanced Research and Studies-M&D, Amity University,

Noida 201303, India

Tel.: +91-120-4392-2189, fax: +91-120-4392-2289

E-mail: * vbhatia@amity.edu, bhawana.bhu1@gmail.com, vkjain@amity.edu

 

Received: 29 June 2012   /Accepted: 23 November 2012   /Published: 30 November 2012

Digital Sensors and Sensor Sysstems

 

Abstract: We have developed a highly sensitive and selective amperometric biosensor for non–enzymatic glucose detection using electrostatically functionalized multiwalled carbon nanotubes (f-MWCNTs) by thermal embedding technique onto flexible substrates. MWCNTs were functionalized (f-MWCNTs) by electrostatic technique to yield hydroxyl groups on their surfaces. The electrocatalytic activity of the modified electrodes towards glucose oxidation was investigated by cyclic voltammetry and amperometric technique. The f-MWCNTs electrodes showed good electrocatalytic activity towards the oxidation of glucose in 0.1M NaOH solution at an applied potential of 0.4 V. A linear dependence (R= 0.9998) with the glucose concentration up to 11 mM and an extraordinary high sensitivity of 5.63 µAmM-1cm-2 with a detection limit of 5 µM were observed. The electrocatalytic activity showed a very fast response in less than 2 seconds with a high selectivity, reproducibility over 6 months and negligible response to interfering species such as chloride ions, lactose, ascorbic acid, fructose and uric acid. The fabrication of the flexible f-MWCNTs electrodes requires low cost, provides long term stability and re-usability and can be easily developed for enzyme-free glucose sensors.

 

Keywords: Carbon nanotubes, Biosensor, Electrostatically, Corona discharge technique

 

 

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