Nitrogen-doped multi-walled carbon nanotubes for paracetamol sensing

作者：Tsierkezos Nikos G^*; Othman Shereen Haj; Ritter Uwe

来源：Ionics, 2013, 19(12): 1897-1905.

DOI：10.1007/s11581-013-0930-1

• Chemical vapor deposition
• Electrochemical sensing
• Multi-walled carbon nanotubes
• Nitrogen doping
• Paracetamol

A novel sensor consisting of nitrogen-doped multi-walled carbon nanotubes was fabricated by means of chemical vapor deposition technique with decomposition of acetonitrile onto oxidized silicon wafer using ferrocene as catalyst. The electrochemical response of carbon nanotubes-based sensor towards oxidation of paracetamol to N-acetyl-p-quinone imine was investigated in phosphate buffer solution (pH 7.0) by means of standard electrochemical techniques. A quasi-reversible response for oxidation of paracetamol was identified on carbon nanotubes-based sensor with detection limit and sensitivity of 0.485 mu M and 0.8406 A M-1 cm(-2), respectively. It was found that the nitrogen doping in carbon nanotubes enhances the sensor's detection ability. Namely, electrochemical studies performed on film consisting of pristine carbon nanotubes reveal as well quasi-reversible response towards oxidation of paracetamol but nevertheless poorer detection ability and sensitivity (0.950 mu M; 0.601 A M-1 cm(-2)). The findings strongly suggest the application of nitrogen-doped carbon nanotubes in biosensing.

• 出版日期2013-12