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Differential etching of ZnO native planes under basic conditions.

Nathan Johann Nicholas1, William Ducker, George V Franks

  • 1Chemical and Biomolecular Engineering, University of Melbourne, Parkville, Victoria, Australia.

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|March 8, 2012
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Summary

This study reveals how zinc oxide (ZnO) surfaces dissolve in alkaline solutions. Different crystal faces of ZnO exhibit unique dissolution behaviors, forming new planes and altering surface structures.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Understanding zinc oxide (ZnO) surface behavior is crucial for its applications.
  • Controlled dissolution is key to tailoring ZnO nanomaterials.
  • Alkaline conditions significantly influence ZnO surface reactivity.

Purpose of the Study:

  • To investigate the in situ dissolution mechanisms of different ZnO crystal surfaces.
  • To analyze the effect of alkaline solutions and citrate additives on ZnO surface morphology.
  • To generate large, well-defined ZnO crystal faces for further surface studies.

Main Methods:

  • In situ Atomic Force Microscopy (AFM) was employed to observe dissolution processes.
  • Polished surfaces of ZnO, including (0001), (1010), and (0001(-)) planes, were studied.
  • Dissolution was performed in aqueous solutions of sodium hydroxide (NaOH) and sodium citrate.

Main Results:

  • The (0001) plane formed stepped surfaces, while the (0001(-)) plane transformed into {1011(-)} planes.
  • Dissolution of the (1010) plane resulted in a mix of (0001) and {1011(-)} planes.
  • Citrate addition modified step morphology on the (0001) plane, increasing dissolution rates in specific directions.

Conclusions:

  • A mechanism of edgewise dissolution, dependent on surface oxygen-to-zinc ratios, explains the observed etching patterns.
  • Controlled chemical dissolution successfully generated large single-index faces of ZnO, suitable for advanced surface chemistry investigations.