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. 2015 Oct 26:5:15765.
doi: 10.1038/srep15765.

Enhanced Dispersion of TiO2 Nanoparticles in a TiO2/PEDOT:PSS Hybrid Nanocomposite via Plasma-Liquid Interactions

Yazi Liu  1   2 , Dan Sun  3 , Sadegh Askari  4 , Jenish Patel  5   4 , Manuel Macias-Montero  4 , Somak Mitra  4 , Richao Zhang  6 , Wen-Feng Lin  7 , Davide Mariotti  4 , Paul Maguire  4
Affiliations

Enhanced Dispersion of TiO2 Nanoparticles in a TiO2/PEDOT:PSS Hybrid Nanocomposite via Plasma-Liquid Interactions

Yazi Liu et al. Sci Rep. .

Abstract

A facile method to synthesize a TiO2/PEDOT:PSS hybrid nanocomposite material in aqueous solution through direct current (DC) plasma processing at atmospheric pressure and room temperature has been demonstrated. The dispersion of the TiO2 nanoparticles is enhanced and TiO2/polymer hybrid nanoparticles with a distinct core shell structure have been obtained. Increased electrical conductivity was observed for the plasma treated TiO2/PEDOT:PSS nanocomposite. The improvement in nanocomposite properties is due to the enhanced dispersion and stability in liquid polymer of microplasma treated TiO2 nanoparticles. Both plasma induced surface charge and nanoparticle surface termination with specific plasma chemical species are proposed to provide an enhanced barrier to nanoparticle agglomeration and promote nanoparticle-polymer binding.

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Figures

Figure 1
Figure 1. Schematic diagram depicting the plasma set-up.
Figure 2
Figure 2
SEM of TiO2 NPs in PEDOT:PSS (a,b) untreated, and (c,d) plasma-treated.
Figure 3
Figure 3
Typical TEM images of (a) untreated and (b) plasma-treated TiO2 /PEDOT:PSS samples.
Figure 4
Figure 4
Typical high resolution TEM images showing details of polymer/TiO2 interface: (a,b) untreated sample and (c,d) plasma-treated sample.
Figure 5
Figure 5
Normalized FTIR spectra with baseline correction (a) TiO2, (b) PEDOT:PSS, (c) untreated TiO2/PEDOT:PSS, (d) plasma-treated TiO2/PEDOT:PSS. The characteristic peak locations expected for TiO2, PEDOT:PSS and H2O2 are labeled in red, black and purple dashed lines, respectively (colour plot available online).
Figure 6
Figure 6. UV-vis absorption spectra of TiO2/PEDOT:PSS samples.
Figure 7
Figure 7. Current−voltage (I−V) characteristics of PEDOT:PSS polymer (dotted), untreated (blue) and plasma treated TiO2/polymer nanocomposites (red).
See this image and copyright information in PMC

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