Copper nanoparticles entrapped in SWCNT-PPy nanocomposite on Pt electrode as NOx electrochemical sensor

Talanta. 2011 Aug 15;85(2):964-9. doi: 10.1016/j.talanta.2011.05.004. Epub 2011 May 13.

Abstract

A highly sensitive NO(x) sensor was designed and developed by electrochemical incorporation of copper nanoparticles (CuNP) on single-walled carbon nanotubes (SWCNT)-polypyrrole (PPy) nanocomposite modified Pt electrode. The modified electrodes were characterized by scanning electron microscopy and energy dispersive X-ray analysis. Further, the electrochemical behavior of the CuNP-SWCNT-PPy-Pt electrode was investigated by cyclic voltammetry. It exhibited the characteristic CuNP reversible redox peaks at -0.15 V and -0.3 V vs. Ag/AgCl respectively. The electrocatalytic activity of the CuNP-SWCNT-PPy-Pt electrode towards NO(x) is four-fold than the CuNP-PPy-Pt electrode. These results clearly revealed that the SWCNT-PPy nanocomposite facilitated the electron transfer from CuNP to Pt electrode and provided an electrochemical approach for the determination of NO(x). A linear dependence (r(2)=0.9946) on the NO(x) concentrations ranging from 0.7 to 2000 μM, with a sensitivity of 0.22 ± 0.002 μA μM(-1)cm(-2) and detection limit of 0.7 μM was observed for the CuNP-SWCNT-PPy-Pt electrode. In addition, the sensor exhibited good reproducibility and retained stability over a period of one month.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Chemistry Techniques, Analytical / instrumentation*
  • Copper / chemistry*
  • Electrochemistry
  • Electrodes
  • Metal Nanoparticles / chemistry
  • Nanocomposites / chemistry*
  • Nanotubes, Carbon / chemistry*
  • Nitrogen Oxides / analysis*
  • Platinum / chemistry*
  • Polymers / chemistry*
  • Pyrroles / chemistry*
  • Reproducibility of Results
  • Time Factors

Substances

  • Nanotubes, Carbon
  • Nitrogen Oxides
  • Polymers
  • Pyrroles
  • polypyrrole
  • Platinum
  • Copper