Doping Effect of Poly(vinylidene fluoride) on Carbon Nanofibers Deduced by Thermoelectric Analysis of Their Melt Mixed Films

IF 4.1 2区 化学 Q2 POLYMER SCIENCE Chinese Journal of Polymer Science Pub Date : 2024-09-27 DOI:10.1007/s10118-024-3200-y
A. J. Paleo, V. M. Serrato, J. M. Mánuel, O. Toledano, E. Muñoz, M. Melle-Franco, B. Krause, P. Pötschke, K. Lozano
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Abstract

The effect of temperature on the electrical conductivity (σ) and Seebeck coefficient (S) of n-type vapor grown carbon nanofibers (CNFs) and poly(vinylidene fluoride) (PVDF) melt-mixed with 15 wt% of those CNFs is analyzed. At 40 °C, the CNFs show stable n-type character (S=−4.8 µV·K−1) with an σ of ca.165 S·m−1, while the PVDF/CNF composite film shows an σ of ca. 9 S·m−1 and near-zero S (S=−0.5 µV·K−1). This experimental reduction in S is studied by the density functional tight binding (DFTB) method revealing a contact electron transfer from the CNFs to the PVDF in the interface. Moreover, in the temperature range from 40 °C to 100 °C, the σ(T) of the CNFs and PVDF/CNF film, successfully described by the 3D variable range hopping (VRH) model, is explained as consequence of a thermally activated backscattering mechanism. On the contrary, the S(T) from 40 °C to 100 °C of the PVDF/CNF film, which satisfactorily matches the model proposed for some multi-walled carbon nanotube (MWCNT) doped mats; however, it does not follow the increase in S(T) found for CNFs. All these findings are presented with the aim of discerning the role of these n-type vapor grown carbon nanofibers on the σ and S of their melt-mixed polymer composites.

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通过熔融混合薄膜的热电分析推测聚偏二氟乙烯对碳纳米纤维的掺杂效应
分析了温度对 n 型气相生长碳纳米管(CNFs)和与 15 wt% 的 CNFs 熔融混合的聚(偏氟乙烯)(PVDF)的电导率(σ)和塞贝克系数(S)的影响。40 °C 时,CNFs 显示出稳定的 n 型特性(S=-4.8 µV-K-1),σ 约为 165 S-m-1,而 PVDF/CNF 复合薄膜的 σ 约为 9 S-m-1,S 接近于零(S=-0.5 µV-K-1)。通过密度泛函紧密结合 (DFTB) 方法对 S 值的这种实验性降低进行了研究,发现在界面上存在从 CNF 到 PVDF 的接触式电子转移。此外,在 40 °C 至 100 °C 的温度范围内,CNFs 和 PVDF/CNF 薄膜的 σ(T) 成功地用三维可变范围跳跃 (VRH) 模型进行了描述,并被解释为热激活反向散射机制的结果。相反,PVDF/CNF 薄膜从 40 °C 到 100 °C 的 S(T) 与某些掺杂多壁碳纳米管 (MWCNT) 垫的模型完全吻合;但是,它并没有跟随 CNF 的 S(T) 增加而增加。介绍所有这些发现的目的是为了弄清这些 n 型气相生长碳纳米管对其熔融混合聚合物复合材料的 σ 和 S 所起的作用。
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来源期刊
Chinese Journal of Polymer Science
Chinese Journal of Polymer Science 化学-高分子科学
CiteScore
7.10
自引率
11.60%
发文量
218
审稿时长
6.0 months
期刊介绍: Chinese Journal of Polymer Science (CJPS) is a monthly journal published in English and sponsored by the Chinese Chemical Society and the Institute of Chemistry, Chinese Academy of Sciences. CJPS is edited by a distinguished Editorial Board headed by Professor Qi-Feng Zhou and supported by an International Advisory Board in which many famous active polymer scientists all over the world are included. The journal was first published in 1983 under the title Polymer Communications and has the current name since 1985. CJPS is a peer-reviewed journal dedicated to the timely publication of original research ideas and results in the field of polymer science. The issues may carry regular papers, rapid communications and notes as well as feature articles. As a leading polymer journal in China published in English, CJPS reflects the new achievements obtained in various laboratories of China, CJPS also includes papers submitted by scientists of different countries and regions outside of China, reflecting the international nature of the journal.
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