Simple chemical synthesis of novel ZnO nanostructures: Role of counter ions

Manoj Pudukudy, Zahira Yaakob

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

This article reports the synthesis, characterisation and photocatalytic activity of novel ZnO nanostructures prepared via the thermal decomposition of hydrozincite. Hydrozincites were obtained by the conventional precipitation route using different zinc salts such as acetate, nitrate, chloride and sulphate. The effect of counter ions (CH3COO-, Cl -, NO3 -, and SO4 2-) on the structural, textural, morphological and optical properties was investigated. Various characterisations depicted the active role of counter ions in the properties of ZnO. Hexagonal wurtzite structure of ZnO with fine crystalline size was obvious from the XRD results, irrespective of the counter ions. Electron microscopic images indicated the role of counter ions in the surface and internal morphology of ZnO nanomaterials. Special coral like agglomerated morphology of elongated particles with high porosity was observed for the ZnO prepared from acetate precursor. Spherical, elongated and irregular shaped bigger lumps of ZnO nanoparticles with various novel morphologies were resulted for the sulphate, nitrate and chloride precursors respectively. Highly ordered porous micro disc like morphology was noted for the ZnO samples prepared from the sulphate and nitrate salts. Photoluminescence spectra showed the characteristic blue and green emission bands, depicting the presence of large crystal defects and high oxygen vacancies in the samples. Photocatalytic activity of the as-prepared ZnO catalysts was examined by the degradation of methylene blue under UV light irradiation. Degradation results indicated their substantial activity with respect to the counter ions. ZnO prepared from the acetate precursor showed highest photoactivity due to its high surface area, special morphology and high oxygen vacancies.

Original languageEnglish
Pages (from-to)78-88
Number of pages11
JournalSolid State Sciences
Volume30
DOIs
Publication statusPublished - Apr 2014

Fingerprint

Radiation counters
Nanostructures
counters
Nitrates
Sulfates
synthesis
nitrates
acetates
sulfates
Acetates
Oxygen vacancies
ions
Chlorides
Salts
chlorides
degradation
salts
Degradation
Crystal defects
Methylene Blue

Keywords

  • Chemical synthesis
  • Counter ions
  • Optical properties
  • Photodegradation
  • Precipitation
  • ZnO nanostructures

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Simple chemical synthesis of novel ZnO nanostructures : Role of counter ions. / Pudukudy, Manoj; Yaakob, Zahira.

In: Solid State Sciences, Vol. 30, 04.2014, p. 78-88.

Research output: Contribution to journalArticle

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