Enhanced photoelectrochemical performance of ZnO nanorod arrays decorated with CdS shell and Ag2S quantum dots

Araa Mebdir Holi, Zulkarnain Zainal, Zainal Abidin Talib, Hong Ngee Lim, Chi Chin Yap, Sook Keng Chang, Asmaa Kadim Ayal

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

Ternary nanostructured Ag2S/CdS/ZnO thin film was prepared by using a simple low-cost hydrothermal method. The hexagonal phase of ZnO nanorods and CdS shells combined with monoclinic Ag2S quantum dots resulted in improved optical and photoelectrochemical properties. CdS shell with high absorption property efficiently compliment the energy levels of ZnO and improved the ability of light absorption. Furthermore, narrow band gap Ag2S also played a vital part in the light harvesting. The photoelectrochemical performance of the ternary nanostructured Ag2S/CdS/ZnO NRs was investigated in a mixture of Na2S and Na2SO3 aqueous solutions under visible light illumination. The Ag2S/CdS/ZnO NRs were found to be more efficient than ZnO NRs, CdS/ZnO NRs, and Ag2S/ZnO NRs as this particular sample gave a maximum photocurrent of 5.69 mA cm−2, which is around 2 and 1.5 times greater than CdS/ZnO NRs and Ag2S/ZnO NRs, respectively. Besides that, it was found that this ternary film possessed 15 times higher photocurrent density than plain ZnO NRs. This is attributed to the larger amount of visible light absorbed by the ternary nanostructured composite.

Original languageEnglish
Pages (from-to)295-303
Number of pages9
JournalSuperlattices and Microstructures
Volume103
DOIs
Publication statusPublished - 1 Mar 2017

Fingerprint

Nanorods
nanorods
Semiconductor quantum dots
quantum dots
Photocurrents
photocurrents
electromagnetic absorption
plains
Light absorption
Electron energy levels
narrowband
Energy gap
Lighting
energy levels
illumination
aqueous solutions
optical properties
Thin films
composite materials
Composite materials

Keywords

  • AgS
  • CdS
  • Hydrothermal deposition
  • Nanorods
  • Ternary nanostructure photoelectrochemical
  • ZnO

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

Cite this

Enhanced photoelectrochemical performance of ZnO nanorod arrays decorated with CdS shell and Ag2S quantum dots. / Holi, Araa Mebdir; Zainal, Zulkarnain; Talib, Zainal Abidin; Lim, Hong Ngee; Yap, Chi Chin; Chang, Sook Keng; Ayal, Asmaa Kadim.

In: Superlattices and Microstructures, Vol. 103, 01.03.2017, p. 295-303.

Research output: Contribution to journalArticle

Holi, Araa Mebdir ; Zainal, Zulkarnain ; Talib, Zainal Abidin ; Lim, Hong Ngee ; Yap, Chi Chin ; Chang, Sook Keng ; Ayal, Asmaa Kadim. / Enhanced photoelectrochemical performance of ZnO nanorod arrays decorated with CdS shell and Ag2S quantum dots. In: Superlattices and Microstructures. 2017 ; Vol. 103. pp. 295-303.
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