Study of Luminescence Properties of PVA Capped Porous Silicon Carbide Microparticles Thin Films Deposited by Spin Coating Method

Year 2017, Volume: 3 Issue: 2, 15 - 19, 01.11.2017

Samira Kacı

Abstract

In order
to be used in an optical device, thin films of pure Poly Vinyl Alcohol and PVA
mixed with porous SiC microparticles were prepared by spin coating technique.
The average size of SiC microparticles were 7mm. An electroless method was used for producing
porous silicon carbide powder under UV irradiation was investigated. The
electroless process was chosen because it does not require electrical contact
during etching like in anodic one. Silver nanolayer coated SiC particles was
formed by polyol process prior the etching and served both as an anode,
catalyst and mask for the reduction of a chemical oxidant. The etchant was
composed of HF and different oxidants in water. Various porous morphologies are
presented and studied as a function of etchant concentration, oxidant type,
etching time, and wavelength of irradiation. Morphological, optical and
photoluminescence characterizations of SiC micropowder embedded in PVA matrix
and deposited as thin films on glass substrates are reported. We concluded that
the chemical etching conditions of SiC powder seems to have a large impact on
the resulting properties. We noticed that SiC powder etched under UV light of
254 nm using K₂S₂O₈ as oxidant, at reaction
temperature of 80°C for t=40min exhibited the best photoluminescence property.

Keywords

Electroless etching process, SiC micropowder, UV irradiation

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