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

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 e...

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Bibliographic Details
Published in:Talanta (Oxford) 2011-08, Vol.85 (2), p.964-969
Main Authors: PRAKASH, Subash, RAJESH, Seenivasan, SUSHIL KUMAR SINGH, BHARGAVA, Kalpana, ILAVAZHAGAN, Govindaswamy, VASU, Veerapandy, KARUNAKARAN, Chandran
Format: Article
Language:English
Subjects:
Analytical chemistry
Chemistry
Chemistry Techniques, Analytical - instrumentation
Copper - chemistry
Electrochemical methods
Electrochemistry
Electrodes
Exact sciences and technology
General, instrumentation
Metal Nanoparticles - chemistry
Nanocomposites - chemistry
Nanotubes, Carbon - chemistry
Nitrogen Oxides - analysis
Platinum - chemistry
Polymers - chemistry
Pyrroles - chemistry
Reproducibility of Results
Time Factors
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Summary: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.
ISSN:0039-9140
1873-3573
DOI:10.1016/j.talanta.2011.05.004