Homogeneous, core-shell, and hollow-shell ZnS colloid-based photonic crystals

Ian Dean Hosein, Chekesha M. Liddell

Research output: Contribution to journalArticle

62 Scopus citations

Abstract

Ordered ZnS-based colloidal crystals from homogeneous, core-shell, and hollow building blocks were prepared via electrosteric colloid stabilization combined with a convective assembly technique. The polyelectrolyte stabilized colloids assembled into face-centered cubic arrays with the (111) face perpendicular to the substrate. Structure-property correlations were made using scanning electron microscopy, scanning transmission electron microscopy, and UV/visible/near-IR spectroscopy. Multilayer film growth, with film thickness of several micrometers, was achieved. Optical spectra showed (111) stopgaps along with pronounced higher order peaks. The spectral position of the photonic stopgap can be predicted using a volume average refractive index and the Max well-Garnett formula for the homogeneous and core-shell particles, respectively. This work holds the promise of harnessing ZnS for optical property engineering and enhanced photonic band gap materials.

Original languageEnglish (US)
Pages (from-to)2892-2897
Number of pages6
JournalLangmuir
Volume23
Issue number5
DOIs
StatePublished - Feb 27 2007
Externally publishedYes

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ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

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