Biomimetic synthesis of nacrelike faceted mesocrystals of ZnO-gelatin composite

Yao Hung Tseng, Hsia Yu Lin, Ming Han Liu, Yang Fang Chen, Chung Yuan Mou

Research output: Contribution to journalArticlepeer-review

89 Citations (Scopus)

Abstract

A fabrication of ZnO hierarchical mesocrystal was achieved by a biomimetic method using gelatin as structuredirecting agent. It was found that the ZnO - gelatin microcrystal with well-defined hexagonal, twin plate shape is built by the slacking of nanoplates. The irregularly edged nanoplates can adjust themselves to each other throughout the microcrystal., resulting in a roughly hexagonal edge. Selected area electron diffraction (SAED) analysis of the ZnO-gelatin microcrystal. demonstrates that all the stacked nanoplates are aligned and oriented to form a single-crystal structure with hexagonal symmetry. The hierarchical structure of ZnO was found to resemble that of naturally occurring nacre. Similar to nacreous architecture, the nanoplate of ZnO was constructed from the oriented attachment of ZnO nanoparticles. More importantly, the lattices of the stacked nanoplates are aligned through minerai, bridges between neighboring plates. A mechanism scheme is proposed for the formation of the gelatin - ZnO hybrid hierarchical structure. The preserved hexagonal shape of the mesocrystal structure consequently results in a whispering gallery mode (WGM) of optical emission where light was confined in the hexagons by total internal reflection. The observation of WGM mode emission in the ZnO hexagon structure shows promises for nanoscale fabrication of optoelectronic devices.

Original languageEnglish
Pages (from-to)18053-18061
Number of pages9
JournalJournal of Physical Chemistry C
Volume113
Issue number42
DOIs
Publication statusPublished - 2009
Externally publishedYes

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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