Non-enzymatic analysis of glucose on printed films based on multi-walled carbon nanotubes
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- Tsierkezos, N.G., Ritter, U., Wetzold, N. et al. Microchim Acta (2012) 179: 157. doi:10.1007/s00604-012-0881-7
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We report on the fabrication of an enzyme–free electrochemical sensor for glucose based on a printed film consisting of multi–walled carbon nanotubes (MWCNTs). The MWCNT–based film can be produced by means of a flexographic printing process on a polycarbonate (PC) substrate. The electrochemical response of the MWCNT–based film (referred to as MWCNT–PC) towards the oxidation of glucose at pH 7 was studied by means of cyclic voltammetry and electrochemical impedance spectroscopy. The MWCNT–PC film exhibits substantial electrocatalytic activity towards the oxidation of glucose at an anodic potential of 0.30 V (vs. Ag/AgCl). The findings reveal that the MWCNT–PC film enables non–enzymatic sensing of glucose with a detection limit as low as 2.16 μM and a sensitivity of 1045 μA∙mM−1∙cm−2.