文献类型：期刊文献

英文题名：Hollow-spherical composites of Polyaniline/Cobalt Sulfide/Carbon nanodots with enhanced magnetocapacitance and electromagnetic wave absorption capabilities

作者：Ge, Chuanjun[1];Zhang, Xiang[1];Liu, Jian[1];Jin, Feng[1];Liu, Jichang[2];Bi, Hong[1,3]

机构：[1]Anhui Univ, Coll Chem & Chem Engn, Hefei 230601, Anhui, Peoples R China;[2]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China;[3]Anhui Univ, Minist Educ, Key Lab Optcelect Informat Acquisit & Manipulat, Hefei, Peoples R China

年份：2016

卷号：378

起止页码：49

外文期刊名：APPLIED SURFACE SCIENCE

收录：;EI(收录号：20161602254438);WOS:【SCI-EXPANDED(收录号:WOS:000376819200007)】；

基金：All of the co-author thank Prof. Yuhua Shen (College of chemistry and chemistry and chemical engineering Anhui University, China) for helping us to measure EDX spectra of samples. This work was financed by the 211 project of Anhui University, the National Natural Science Foundation of China (Grant No. 51272002), the University Excellent Youth Talents Foundation of Anhui province (2013SQRL066ZD) and the Key Laboratory of Environmental Friendly Polymer Materials of Anhui Province, Anhui University.

语种：英文

外文关键词：Polyaniline; Elelctromagnetic wave absorption; Magnetocapacitance; Magnetic field; Hollow-spherical

摘要：Hollow-spherical composites of polyaniline/cobalt sulfide/carbon nanodots (PANI/CoS/CDs-0.5T) have been synthesized by in situ polymerization under an applied magnetic field (MF) of 0.5 T. As a control, PANI/CoS/CDs-OT composites have been synthesized without a MF. Both composites acting as electrodes present obvious magnetocapacitances at a scan rate of 100 mV s(-1) while the electrochemical cell tested under an external MF of 0.5 T. Notably, PANI/CoS/CDs-0.5T composites show larger magnetocapacitances than PANI/CoS/CDs-OT composites at different scan rates from 5 to 100 mV s(-1). Electrochemical impedance spectroscopy (EIS) results indicate that MF can reduce charge transfer resistance at electrode/electrolyte interface. More importantly, PANI/CoS/CDs-0.5T composites show a much stronger electromagnetic wave (EMW) absorbing capability than PANI/CoS/CDs-OT in the range of 2-18 GHz which is attributed to an increased dielectric loss and a magnetic loss in low frequency range of 2-12.5 GHz. MF-induced ferromagnetic nanodomains of Coe* clusters in the PANI/CoS/CDs-0.5T composites increase the complex permittivity and create more interfacial polarizations or the Maxwell-Wagner effect, which leads to increased dielectric loss. Compared with PANI/CoS/CDs-OT composites with diamagnetic behaviour, MF-induced weak ferromagnetism of CoS in the PANI/CoS/CDs-0.5T composites has caused additional magnetic loss. This work provides an efficient way for modulating electrochemical or electromagnetic properties of inorganic/polymer nanocomposites by employing an external MF. (C) 2016 Elsevier B.V. All rights reserved.