Pulsed electrodeposition of CdS on ZnO nanorods for highly sensitive photoelectrochemical sensing of copper (II) ions

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review

1 Scopus Citations
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Author(s)

  • Hao Wu
  • Zhaoke Zheng
  • Yiming Tang
  • Nay Ming Huang
  • Rose Amal
  • Hong Ngee Lim

Related Research Unit(s)

Detail(s)

Original languageEnglish
Article numbere00075
Journal / PublicationSustainable Materials and Technologies
Volume18
Early online date19 Aug 2018
Publication statusPublished - Dec 2018

Abstract

Pulsed electrodeposition was adopted to decorate one-dimensional (1D) ZnO nanorods with CdS nanocrystals. The synthesized 1D ZnO-CdS hybrid photoelectrode was employed in the construction of a dynamic photoelectrochemical (PEC) sensing system. The surface analysis showed that CdS nanocrystals in the size of ca. 10 nm were deposited and homogeneously distributed on ZnO nanorods with the interface of high quality. Under visible light illumination, the ZnO-CdS hybrid photoelectrode achieved an anodic photocurrent density of 5.8 mA cm−2 at 0.3 V vs. Ag/AgCl (1 M KCl), owing to the extended absorption in the visible light region, enlarged active interfaces, and efficient separation of photogenerated charge carriers. By the interaction of Cu2+ ions with CdS nanocrystals via the formation of CuxS, the ZnO-CdS hybrid photoelectrode was developed as a PEC sensor for the detection of Cu2+ ions. A fast parasitic photocurrent response to the addition of Cu2+ ions was observed in the sensing test. The photocurrent density of the developed sensor was linearly declined with increasing the concentration of Cu2+ ions from 0.01–1 μM and 1–1000 μM at a logarithm scale. Moreover, it exhibits a limit of detection (3σ/S) of 3 nM with high selectivity and good reproducibility

Research Area(s)

  • Photoelectrochemical sensing, Pulsed electrodeposition, ZnO-CdS nanostructures

Citation Format(s)

Pulsed electrodeposition of CdS on ZnO nanorods for highly sensitive photoelectrochemical sensing of copper (II) ions. / Wu, Hao; Zheng, Zhaoke; Tang, Yiming; Huang, Nay Ming; Amal, Rose; Lim, Hong Ngee; Ng, Yun Hau.

In: Sustainable Materials and Technologies, Vol. 18, e00075, 12.2018.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalNot applicablepeer-review