Processing and structural characteristics of encapsulated ZnO in porous polysiloxane-derived ceramics

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概要

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• A facile processing strategy based on a simple pressing and heat-treatment at 800°C in air or argon was successfully demonstrated for fabricating encapsulated ZnO in porous polysiloxane-derived ceramic matrix. The composite samples contain ZnO crystallites with wurtzite structure embedded in amorphous SiO2 or SiOC matrix and have 51–58% porosity depending on the starting polysiloxane content and heat-treatment atmosphere. For the samples heat-treated in air, the one with more ZnO content in the batch composition showed higher green-emission intensity as well as lower excitonic-emission intensity in photoluminescence (PL) spectrum compared to the one with less ZnO content. The result can be understood in terms of the amount of defects such as oxygen vacancies in the ZnO crystallites: the former has higher defect density than the latter. Raman spectra for the two samples support the interpretation. The samples heat-treated in argon exhibit weaker PL strength compared to the air-treated ones in the whole photon-energy range, attributable to the secondary phase (ZnSiO3) formation.

著者

• Eom Jung-hye

  Dep. Of Materials Sci. And Engineering The Univ. Of Seoul

• Kim Kwang

  Department Of Anatomy Wonkwang University

• EOM Jung-Hye

  Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of S

• KIM Young-Wook

  Functional Ceramics Laboratory, Department of Materials Science and Engineering, The University of S

• EOM Jung-Hye

  Functional Ceramics Laboratory, Department of Materials Science and Engineering, University of Seoul

• KIM Kwang

  Department of Advanced Materials Engineering (Polymerics Program), Korea Advanced Institute of Science and Technology (KAIST)

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