Nanostructured Semiconducting PEDOT–TiO2/ZnO Hybrid Composites for Nanodevice Applications

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• 作者：Rajaraman Ramakrishnan ; Sudha J. Devaki ; A. Aashish ; Senoy Thomas ; Manoj Raama Varma ; Najiya KPP
• 刊名：Journal of Physical Chemistry C
• 出版年：2016
• 出版时间：March 3, 2016
• 年：2016
• 卷：120
• 期：8
• 页码：4199-4210
• 全文大小：751K
• ISSN：1932-7455

文摘

In this paper, we have developed a simple strategy for the preparation of hybrid nanocomposites of poly(3,4-ethylenedioxythiophene)–TiO₂/ZnO (PZT) and demonstrated its application in a thermoelectric device. Hierarchical hetero-nanostructured TiO₂/ZnO (ZTO) was prepared by a facile sol–gel process in the presence of a biocapping agent. PZT was prepared by in situ polymerization of EDOT in the presence of ZTO. It was characterized by UV–visible, FT-IR, XRD, Raman, SEM, TEM, and AFM analyses. Results revealed homogeneous distribution of ZTO with a heterocrystalline phase of wurtzite ZnO/anatase TiO₂ having high density of various defects in the hybrid nanocomposite. Studies showed that ZTO is excellently interfaced with highly ordered self-assembled extended π-layers of PEDOT chains, which could enhance the charge carrier concentration (3.92 × 10²⁰ cm^–3) and charge carrier mobility (0.83 cm² V^–1 s^–1). Furthermore, we have demonstrated its application as a thermoelectric material by fabricating the device (Cu/PZT/Cu), which showed low thermal conductivity of 0.0495 Wm^–1K^–1, Seebeck coefficient of 19.05 μV K^–1, power factor of 1.28 μW m^–1K^–2, and figure of merit of 4.8 × 10^–3 at ambient temperature. All of these excellent material properties of PZT suggest its application as an active material for the fabrication of nanoelectronic devices with large area.