Cold-sintered V2O5-PEDOT:PSS nanocomposites for negative temperature coefficient materials

Yingying Zhao, Seth S. Berbano, Lisheng Gao, Ke Wang, Jing Guo, Kosuke Tsuji, Jiping Wang, Clive A. Randall

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

A low temperature sintering method, namely cold sintering process, was used to prepare 97 vol%V2O5-3 vol% PEDOT:PSS (Poly(3,4-ethylenedioxythiophene) polystyrene sulfonate ceramic-polymer nanocomposites. The density, phase purity, microstructure, elemental distribution and electrical properties of sintered tape-cast films were investigated. The composition with 97 vol%V2O5-3 vol% PEDOT:PSS ceramic-polymer nanocomposites can be densified (∼90%) after a cold sintering of 140 °C for 45 min under a uniaxial pressure of 300 MPa. The Transmission Electron Microscopy (TEM) microstructure shows that a ∼10 nm thick intergranular polymer of PEDOT:PSS has been distributed around the V2O5 grains after cold sintering. The resistivity decreases with temperature increasing, indicating a typical negative temperature coefficient (NTC) characteristic. The resistivity at 25 °C, temperature coefficient α at 25 °C, and B coefficient (material constant) are 6.34 Ωm, −2.4% K−1 and 2153 K, respectively. The V2O5-PEDOT:PSS nanocomposite materials are suitable for new NTC devices, with properties that are comparable to traditional NTC materials that are sintered at much higher temperatures and with much more complexed process and compositions.

Original languageEnglish (US)
Pages (from-to)1257-1262
Number of pages6
JournalJournal of the European Ceramic Society
Volume39
Issue number4
DOIs
StatePublished - Apr 2019

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All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

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