Copper nanoparticles entrapped in SWCNT-PPy nanocomposite on Pt electrode as NOx electrochemical sensor |
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Authors: | Prakash Subash Rajesh Seenivasan Singh Sushil Kumar Bhargava Kalpana Ilavazhagan Govindaswamy Vasu Veerapandy Karunakaran Chandran |
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Institution: | a Department of Physics, VHNSN College, Virudhunagar 626001, India b Biomedical Research Laboratory, Department of Chemistry, VHNSN College, Virudhunagar 626001, India c Si-MEMS Division, Solid State Physics Laboratory (SSPL), New Delhi 110054, India d Peptide and Proteomics Division, Defence Institute of Physiology and Allied Sciences (DIPAS), New Delhi 110054, India e School of Physics, Madurai Kamaraj University, Madurai 625021, India |
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Abstract: | A highly sensitive NOx 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 NOx 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 NOx. A linear dependence (r2 = 0.9946) on the NOx 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. |
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Keywords: | NOx electrochemical sensor Copper nanoparticles Single-walled carbon nanotube Polypyrrole matrix |
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