TY - JOUR
T1 - Semiconducting properties of cold sintered V2O5 ceramics and Co-sintered V2O5-PEDOT:PSS composites
AU - Guo, Jing
AU - Guo, Hanzheng
AU - Heidary, Damoon Sohrabi Baba
AU - Funahashi, Shuichi
AU - Randall, Clive A.
N1 - Funding Information:
This work was supported by the National Science Foundation, as part of the Center for Dielectrics and Piezoelectrics under Grant Nos. IIP-1361571 and 1361503. The authors would like to thank 5Steven E. Perini (Materials Research Institute, The Pennsylvania State University) for his help in the measurements of temperature dependent conductivity under vacuum. The authors also thank Jonathan A. Bock (Materials Research Institute, The Pennsylvania State University) for his help in the Seebeck coefficient measurements.
Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2017/4/1
Y1 - 2017/4/1
N2 - Recently we established a sintering approach, namely Cold Sintering Process (CSP), to densify ceramics and ceramic-polymer composites at extraordinarily low temperatures. In this work, the microstructures and semiconducting properties of V2O5 ceramic and (1-x)V2O5-xPEDOT:PSS composites cold sintered at 120 °C were investigated. The electrical conductivity (25 °C), activation energy (25 °C), and Seebeck coefficient (50 °C) of V2O5 are 4.8 × 10−4 S/cm, 0.25 eV, and −990 μV/K, respectively. The conduction mechanism was studied using a hopping model. A reversible metal-insulator transition (MIT) was observed with V2O5 samples exposed to a N2 atmosphere, whereas in a vacuum atmosphere, no obvious MIT could be detected. With the addition of 1–2 Vol% PEDOT:PSS, the electrical conductivity (50 °C) dramatically increases from 10−4 to 10−3 ∼ 10−2 S/cm, and the Seebeck coefficient (50 °C) shifts from −990 to −(600 ∼ 250) μV/K. All the results indicate that CSP may offer a new processing route for the semiconductor electroceramic development without a compromise to the all-important electrical properties.
AB - Recently we established a sintering approach, namely Cold Sintering Process (CSP), to densify ceramics and ceramic-polymer composites at extraordinarily low temperatures. In this work, the microstructures and semiconducting properties of V2O5 ceramic and (1-x)V2O5-xPEDOT:PSS composites cold sintered at 120 °C were investigated. The electrical conductivity (25 °C), activation energy (25 °C), and Seebeck coefficient (50 °C) of V2O5 are 4.8 × 10−4 S/cm, 0.25 eV, and −990 μV/K, respectively. The conduction mechanism was studied using a hopping model. A reversible metal-insulator transition (MIT) was observed with V2O5 samples exposed to a N2 atmosphere, whereas in a vacuum atmosphere, no obvious MIT could be detected. With the addition of 1–2 Vol% PEDOT:PSS, the electrical conductivity (50 °C) dramatically increases from 10−4 to 10−3 ∼ 10−2 S/cm, and the Seebeck coefficient (50 °C) shifts from −990 to −(600 ∼ 250) μV/K. All the results indicate that CSP may offer a new processing route for the semiconductor electroceramic development without a compromise to the all-important electrical properties.
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U2 - 10.1016/j.jeurceramsoc.2016.11.021
DO - 10.1016/j.jeurceramsoc.2016.11.021
M3 - Article
AN - SCOPUS:85006817251
SN - 0955-2219
VL - 37
SP - 1529
EP - 1534
JO - Journal of the European Ceramic Society
JF - Journal of the European Ceramic Society
IS - 4
ER -