Semiconducting properties of cold sintered V2O5 ceramics and Co-sintered V2O5-PEDOT:PSS composites
Semiconducting properties of cold sintered V2O5 ceramics and Co-sintered V2O5-PEDOT:PSS composites
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DOI：
10.1016/j.jeurceramsoc.2016.11.021
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发表时间：
2017-04-01
影响因子：
5.7
通讯作者：
Randall, Clive A.
中科院分区：
文献类型：
--
作者：
Guo, Jing;Guo, Hanzheng;Randall, Clive A.
最近，我们建立了一种烧结方法，即冷烧结工艺（CSP），在极低的温度下致密陶瓷和陶瓷-聚合物复合材料。本文研究了120 ℃冷烧结V205陶瓷和（1-x）V205-xPEDOT：PSS复合材料的显微结构和半导化性能。V205的电导率（25 C-o）、活化能（25 C-o）和塞贝克系数（50（o）C）分别为4.8 x 10-4S/cm、0.25 eV和-990 V/IC。导电机制进行了研究，使用跳跃模型。V2 O 5样品在N2气氛中出现了可逆的金属-绝缘体转变（MIT），而在真空气氛中没有明显的MIT。当PEDOT：PSS的加入量为1-2 μ g/L时，电导率（50 C）由10 ~（-4）S/cm提高到10 ~（-3）~ 10 ~（-2）S/cm，塞贝克系数（50 C）由-990 tV/K提高到-600250 tV/K。这些结果表明，CSP工艺可以为半导体电瓷的发展提供一条新的工艺路线，而不影响其重要的电性能。(C)2016爱思唯尔有限公司版权所有
Recently we established a sintering approach, namely Cold Sintering Process (CSP), to density ceramics and ceramic-polymer composites at extraordinarily low temperatures. In this work, the microstructures and semiconducting properties of V205 ceramic and (1-x)V205-xPEDOT:PSS composites cold sintered at 120(o)C were investigated. The electrical conductivity (25 C-o), activation energy (25 C-o), and Seebeck coefficient (50(o)C) of V205 are 4.8 x 10-4S/cm, 0.25 eV, and -990 V/IC, respectively. The conduction mechanism was studied using a hopping model. A reversible metal -insulator transition (MIT) was observed with V205 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-o) dramatically increases from 10-4 to 10-3 -10-2S/cm, and the Seebeck coefficient (50(o)C) shifts from -990 to -(600250).tV/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.(C) 2016 Elsevier Ltd. All rights reserved.