TY - JOUR
T1 - Cold-sintered V2O5-PEDOT:PSS nanocomposites for negative temperature coefficient materials
AU - Zhao, Yingying
AU - Berbano, Seth S.
AU - Gao, Lisheng
AU - Wang, Ke
AU - Guo, Jing
AU - Tsuji, Kosuke
AU - Wang, Jiping
AU - Randall, Clive A.
N1 - Funding Information:
Y.Y. Zhao acknowledges the financial support from the China Scholarship Council (CSC). The authors would like to thank Dr. Trevor Clark for the help in TEM sample preparation. The authors would also like to thank Amanda Baker for the help in the instrumentation support and Dr. Xuetong Zhao for helpful discussions.
Publisher Copyright:
© 2018 Elsevier Ltd
PY - 2019/4
Y1 - 2019/4
N2 - 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.
AB - 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.
UR - https://www.scopus.com/pages/publications/85055741034
UR - https://www.scopus.com/inward/citedby.url?scp=85055741034&partnerID=8YFLogxK
U2 - 10.1016/j.jeurceramsoc.2018.10.018
DO - 10.1016/j.jeurceramsoc.2018.10.018
M3 - Article
AN - SCOPUS:85055741034
SN - 0955-2219
VL - 39
SP - 1257
EP - 1262
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 4
ER -