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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Hybrid Core-Shell Nanocomposites Based on Silicon Carbide Nanoparticles Functionalized by Conducting Polyaniline: Electron Paramagnetic Resonance Investigations
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Hybrid Core-Shell Nanocomposites Based on Silicon Carbide Nanoparticles Functionalized by Conducting Polyaniline: Electron Paramagnetic Resonance Investigations

机译：基于导电聚苯胺功能化的碳化硅纳米粒子的混合核-壳纳米复合材料：电子顺磁共振研究。

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摘要

Electron paramagnetic resonance (EPR) investigations were carried out on hybrid core-shell nanocomposites based on silicon carbide nanoparticles (SiC) and polyaniline (PANI) doped with camphor sulfonic acid (CSA). Charge carrier concentrations and thermal activations in low and high conducting polymers arranged as thin layers (2-5 nm) on the nanoparticle surfaces were investigated in a wide temperature range [4-430 K]. The EPR results and analyses are supported by complementary investigations of the macroscopic electrical conductivity and vibrational properties probed by Raman spectrometry. Temperature-dependent EPR measurements indicate paramagnetic susceptibilities with Curie-Weiss-like features and thermally activated spins. In contrast to the annealing stability of the nanocomposites, kinetic phenomena were witnessed on the EPR spectra of highly doped PANI. These phenomena correlate with the occurrence of transverse bipolarons which lead to irreversible structural changes in the polymer backbone. Polaron and bipolaron contributions to the electronic transport mechanism and the stability of the materials after annealing were found to be caused by doping rates of both the bare PANI and the nanocomposites.
机译：对基于掺杂有樟脑磺酸（CSA）的碳化硅纳米颗粒（SiC）和聚苯胺（PANI）的混合核-壳纳米复合材料进行了电子顺磁共振（EPR）研究。在较宽的温度范围[4-430 K]下研究了纳米颗粒表面上排列成薄层（2-5 nm）的低导电性和高导电性聚合物中的载流子浓度和热活化。 EPR结果和分析得到拉曼光谱仪探测的宏观电导率和振动特性的补充研究的支持。随温度变化的EPR测量表明，顺磁磁化率具有居里-魏斯样特征和热活化自旋。与纳米复合材料的退火稳定性相反，在高掺杂PANI的EPR光谱上观察到动力学现象。这些现象与横向双极化子的出现有关，后者导致聚合物主链中不可逆的结构变化。发现极化子和双极化子对电子传输机理和退火后材料稳定性的贡献是由裸PANI和纳米复合材料的掺杂速率引起的。

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