Cold-sintered V2O5-PEDOT:PSS nanocomposites for negative temperature coefficient materials. Issue 4 (April 2019)

• Record Type: Journal Article
• Authors: Zhao, Yingying; Berbano, Seth S.; Gao, Lisheng; Wang, Ke; Guo, Jing; Tsuji, Kosuke; Wang, Jiping; Randall, Clive A.
• Is Part Of: Journal of the European Ceramic Society. Volume 39:Issue 4(2019)
• Page Start: 1257
• Page End: 1262
• Publication Date: 2019-04
• Subjects: Cold sintering process -- Negative temperature coefficient materials -- V2O5-PEDOT:PSS nanocomposite -- Conduction mechanism; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2018.10.018
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: A low temperature sintering method, namely cold sintering process, was used to prepare 97 vol%V2 O5 -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%V2 O5 -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 V2 O5 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 V2 O5 -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.