Nanocone Decorated ZnO Microspheres Exposing the (0001) Plane and Enhanced Photocatalytic Properties

Heather F. Greer (Lead / Corresponding author), Wuzong Zhou, Guan Zhang, Hervé Ménard

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Abstract

ZnO spherical particles exposing only the (0001) planes are prepared by an established solvothermal method using a water–ethylene glycol (EG) mix as a solvent. It is found that poorly crystalline nanoparticles form first, followed by their aggregation into microspheres consisting of crystallites embedded in EG and precursor molecules/ions. The grown up nanocrystallites and nanocones in the microspheres are all radially aligned. The possible formation mechanisms, in particular, the roles of water molecules, EG, and the intrinsic dipolar field of ZnO crystals, are discussed. X-ray photoelecton spectroscopy experiments indicate that the spherical particles are terminated solely by zinc atoms. Brunauer–Emmett–Teller measurements in conjunction with the degradation of methylene blue dye data demonstrate that the photocatalytic performance of the ZnO spheres depends on the growth time and is significantly improved compared to traditional ZnO nanorods. This study is a rare example which combines nanostructural characterization of ZnO particles terminated with a single (0001) plane of known Zn2+-polarity with their photocatalytic performance.

Original languageEnglish
Article number1601238
JournalAdvanced Materials Interfaces
Volume4
Issue number13
Early online date24 Apr 2017
DOIs
Publication statusPublished - 7 Jul 2017

Keywords

  • crystal growth
  • electron microscopy
  • photocatalysis
  • polar surface
  • ZnO

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