Synthesis and Characterization of Poly(N-vinylcarbazole)/Graphene Nanocomposites.
Synthesis and Characterization of Poly(N-vinylcarbazole)/Graphene Nanocomposites.
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聚（N-乙烯基咔唑）/石墨烯纳米复合材料的合成和表征。
DOI：
10.1166/jnn.2015.9485
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发表时间：
2015
影响因子：
--
通讯作者：
B. B. Nayak
中科院分区：
文献类型：
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作者：
Kartick Bindumadhavan;Saheli Roy;S. K. Srivastava;B. B. Nayak
本工作描述了石墨烯作为引发剂和填料的双重作用，用于聚合N-乙烯基咔唑和形成聚（N-乙烯基咔唑）/石墨烯（PVK/Gr）纳米复合材料。傅里叶变换红外（FTIR）和X射线衍射（XRD）研究证实了PVK及其石墨烯纳米复合材料的形成。扫描电子显微镜（SEM）和透射电子显微镜（TEM）显示石墨烯片晶分散在球形PVK基体中。X射线光电子能谱（XPS）也揭示了PVK的形成以及PVK与石墨烯之间存在相互作用。热重分析（TGA）已经表明，当20wt%的重量损失作为比较点时，与纯PVK相比，PVK/石墨烯（0.5wt%）的热稳定性最大提高了-76 ° C。紫外（UV）和光致发光（PL）的研究建立了从聚合物链到石墨烯片晶的电荷转移。介电测量已经示出了具有lwt %石墨烯负载的介电常数（ε）的最大改善（87%）。交流电导率（σ）随频率（ω）的变化证实了PVK/石墨烯纳米复合材料具有高介电常数的绝缘行为。
The present work describes the dual role of graphene as an initiator and filler for polymerization of N-vinylcarbazole and formation of poly(N-vinylcarbazole)/graphene (PVK/Gr) nanocomposites. Fourier transformation infrared (FTIR) and X-ray diffraction (XRD) studies confirmed the formation of PVK as well its graphene nanocomposites. Scanning electron micrograph (SEM) and transmission electron microscopy (TEM) revealed the graphene platelets are dispersed in the matrix of spherical PVK. X-ray photoelectron spectroscopy (XPS) also revealed formation of PVK and presence of interaction between PVK and graphene. Thermograivmetric analysis (TGA) have shown that the thermal stability of PVK/graphene (0.5 wt%) is maximum improved by -76 degrees C compared to neat PVK, when 20 wt% weight loss is taken as a point of comparison. Ultraviolet (UV) and photoluminescence (PL) studies established the charge transfer from polymer chains to the graphene platelets. Dielectric measurements have shown the maximum improvement (87%) in dielectric constant (ε) with 1 wt% graphene loading. The variation of ac conductivity (σ) with frequency (ψ) confirmed the insulating behavior of PVK/graphene nanocomposites possessing high dielectric constant.