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通过化学氧化聚合法制备的聚吡咯/（苯硒）纳米复合材料呈现出的开关型正温度系数行为。

A Switching-Type Positive Temperature Coefficient Behavior Exhibited by PPy/(PhSe) Nanocomposite Prepared by Chemical Oxidative Polymerization.

作者信息

Jan Tabee, Ahmad Rizvi Masood, Moosvi Syed Kazim, Najar Mohd Hanief, Husain Mir Sajjad, Peerzada Ghulam Mustafa

机构信息

Department of Chemistry, University of Kashmir, Srinagar 190006, J&K, India.

School Education Department, Srinagar 190001, J&K, India.

出版信息

ACS Omega. 2021 Mar 8;6(11):7413-7421. doi: 10.1021/acsomega.0c05799. eCollection 2021 Mar 23.

DOI:10.1021/acsomega.0c05799
PMID:33778254
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC7992069/
Abstract

In this study, we prepared a polypyrrole-diphenyl diselenide [PPy/(PhSe)] nanocomposite by oxidative chemical polymerization for the purpose of temperature sensing applications. Fourier transform infrared spectroscopy, X-ray diffraction and scanning transmission electron microscopy confirmed the synthesis of the above material. Thermogravimetry (TG) revealed enhanced thermal stability as compared to pristine polypyrrole (PPy). Dielectric study showed the material to have a dielectric constant of colossal value. The material has been found to exhibit correlated barrier hopping conduction (CBH) wherein hopping of charge carriers takes place over the insulating (PhSe) barrier. The maximum barrier height was found to be 0.224 eV. The nanocomposite material was found to exhibit a switching-type positive temperature coefficient (PTC) behavior with a Curie temperature of 400 K. This has been explained by a CBH model wherein PPy chains expand upon heating, thereby reducing the barrier height to facilitate current flow. However, above 400 K, disruption of PPy chains allows to reflect a PTC behavior. This has been in agreement with TG data.

摘要

在本研究中，我们通过氧化化学聚合制备了聚吡咯 - 二苯基二硒化物[PPy/(PhSe)]纳米复合材料，用于温度传感应用。傅里叶变换红外光谱、X射线衍射和扫描透射电子显微镜证实了上述材料的合成。热重分析（TG）表明，与原始聚吡咯（PPy）相比，其热稳定性增强。介电研究表明该材料具有极大值的介电常数。已发现该材料表现出相关势垒跳跃传导（CBH），其中电荷载流子在绝缘（PhSe）势垒上发生跳跃。发现最大势垒高度为0.224 eV。发现该纳米复合材料表现出开关型正温度系数（PTC）行为，居里温度为400 K。这已通过CBH模型得到解释，其中PPy链在加热时膨胀，从而降低势垒高度以促进电流流动。然而，在400 K以上，PPy链的破坏导致呈现PTC行为。这与TG数据一致。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/e784a9be57bf/ao0c05799_0011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/81de32a157b5/ao0c05799_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/b83902e9546b/ao0c05799_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/ee4492182041/ao0c05799_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/3ef722a9520a/ao0c05799_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/b2a483c8032f/ao0c05799_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/0df7478f31d1/ao0c05799_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/4a17a71a58bc/ao0c05799_0008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/0c49372178ff/ao0c05799_0009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/7405c7e9bc24/ao0c05799_0010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/e784a9be57bf/ao0c05799_0011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/81de32a157b5/ao0c05799_0002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/b83902e9546b/ao0c05799_0003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/ee4492182041/ao0c05799_0004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/3ef722a9520a/ao0c05799_0005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/b2a483c8032f/ao0c05799_0006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/0df7478f31d1/ao0c05799_0007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/4a17a71a58bc/ao0c05799_0008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/0c49372178ff/ao0c05799_0009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/7405c7e9bc24/ao0c05799_0010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/2224/7992069/e784a9be57bf/ao0c05799_0011.jpg

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