Reduced Graphene Oxide/Copper Nanoparticle Composites as Electrochemical Sensor Materials for Nitrate Detection

M. Sookhakian, Mohd Asri Mat Teridi, Goh Boon Tong, Pei Meng Woi, Munawar Khalil, Y. Alias

Research output: Contribution to journalArticlepeer-review

Abstract

An efficient electrochemical nitrate (NO3-) sensor consisting of a copper nanoparticle-reduced graphene oxide composite (Cu-rGO) with different rGO loadings was fabricated on indium tin oxide glass (ITO) by simple one-pot electrochemical deposition. The one-pot electrochemical deposition allows for the formation of Cu nanoparticles, reduction of graphene oxide, and decoration of Cu nanoparticles onto the rGO surface simultaneously. The as-electrochemically deposited Cu-rGO-modified ITO electrode was characterized using X-ray diffraction, transmission electron microscopy, and X-ray photoelectron spectroscopy. The effect of rGO on the electrocatalytic activity of the Cu-rGO-modified ITO electrode toward NO3- reduction was investigated. The Cu-rGO composite with 0.5 mg mL-1 rGO loading shows better sensitivity, a lower detection limit, and a wide linear detection range. Finally, the Cu-rGO-modified ITO electrode with 0.5 mg mL-1 rGO loading was used to measure nitrate in real samples.

Original languageEnglish
Pages (from-to)12737-12744
Number of pages8
JournalACS Applied Nano Materials
Volume4
Issue number11
DOIs
Publication statusPublished - 26 Nov 2021

Keywords

  • acidic medium
  • copper nanoparticles
  • electrodeposition
  • nitrate sensor
  • reduced graphene oxide

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