title: Copper nanoparticles entrapped in SWCNT-PPy nanocomposite on Pt electrode as NOx electrochemical sensor.
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.
authors: Department of Physics, VHNSN College, Virudhunagar 626001, India.
authors: Subash
authors: S
authors: Prakash
authors: Seenivasan
authors: S
authors: Rajesh
authors: Sushil Kumar
authors: SK
authors: Singh
authors: Kalpana
authors: K
authors: Bhargava
authors: Govindaswamy
authors: G
authors: Ilavazhagan
authors: Veerapandy
authors: V
authors: Vasu
authors: Chandran
authors: C
authors: Karunakaran
mesh_terms: D002623:Chemistry Techniques, Analytical / Q000295:instrumentation*; D003300:Copper / Q000737:chemistry*; D004563:Electrochemistry; D004566:Electrodes; D053768:Metal Nanoparticles / Q000737:chemistry; D053761:Nanocomposites / Q000737:chemistry*; D037742:Nanotubes, Carbon / Q000737:chemistry*; D009589:Nitrogen Oxides / Q000032:analysis*; D010984:Platinum / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D015203:Reproducibility of Results; D013997:Time Factors
chemical_list: D037742:Nanotubes, Carbon; D009589:Nitrogen Oxides; D011108:Polymers; D011758:Pyrroles; C067635:polypyrrole; D010984:Platinum; D003300:Copper