Material Coating on Powder Surfaces by Dielectric Barrier Discharge at Atmospheric Pressure
Date Issued
2015
Date
2015
Author(s)
Zseng, Wei-Shang
Abstract
In this work, we synthesize core-shell nanoparticles with different precursor and particles by an ultra-fast, one-step, dry, and atmospheric-pressure plasma fluidized bed process. Plasma-enhanced chemical vapor deposition (PECVD) has been widely used for thin film surface treatment and surface modification. However, PECVD is difficult to treat particles due to some problem like non-uniform coating and particle agglomeration. The fluidized bed technology has some advantage to treating; for example, well solid mixing and breakage of agglomeration. First, we coating carbon film with different particle acetylene (C2H2) by as carbon source. The conductivity of coated particle is in significantly enhancement after dihydrogen process. Then the SiOx film have been coated with Tetraethyl orthosilicate (TEOS) as precursor. An improved ultraviolet (UV) to visible luminescence (better than pure ZnO nanoparticles) was observed from ZnO/SiO2 core-shell nanoparticles by Fluorescence Spectrophotometer. The particles are well-dispersed in ethanol after silica coating due to the increase of zeta potential and breakage of agglomeration. At last, we use Octafluorocyclobutane (C¬4F8) as precursor to coat Teflon-like film on SiO2 and TiO2 particles. The hydrophilicity of host particle changed significantly after coating. We believe this fabrication technique brings impact to the field of photocatalysis, battery and emitting device.
Subjects
nano-particels
coating
plasma
DBD
fluidized bed
Type
thesis
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