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首页> 外文期刊>Journal of materials science >Effect of graphene nanoplatelets concentration on optical, dielectric and electrical properties of poly(2-ethyl-2-oxazoline)-polyvinylpyrrolidone-graphene nanocomposites
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Effect of graphene nanoplatelets concentration on optical, dielectric and electrical properties of poly(2-ethyl-2-oxazoline)-polyvinylpyrrolidone-graphene nanocomposites

机译：石墨烯纳米孔浓度对聚（2-乙基-2-恶唑啉） - 聚乙烯基吡咯烷酮 - 石墨烯纳米复合材料的光学，介电和电性能的影响

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摘要

The polymer nanocomposites with good optical, dielectric and electrical properties have taken faithfulness in research due to their distinguishing benefits in electronic applications. Hence, in the present investigation, poly(2-ethyl-2-oxazoline)-polyvinylpyrrolidone-graphene nanoplatelets (PEOX-PVP-GNPs) nanocomposites were synthesized and their properties were evaluated. Field emission scanning electron microscopy micrograph images showed a uniform dispersion of GNPs within the PEOX-PVP binary matrix. X-ray diffraction analysis illustrated the increase of crystallinity of nanocomposites with increasing weight percentage of GNPs. Fourier-transform infrared spectroscopy confirmed intermolecular interaction between the PEOX-PVP matrix and the GNPs. PEOX-PVP-graphene nanocomposite shows decrease in the optical energy band gap and increase in Urbach energy with increasing GNPs concentration. PEOX-PVP-10 wt% graphene nanocomposite has the lowest band gap (= 1.2 eV) and highest Urbach energy (= 7.43 eV). Dielectric constant, dielectric loss and tangent loss of nanocomposites decrease with increasing frequency of the applied electric field. On the other hand, the AC electrical conductivity of nanocomposites is independent of frequency, at lower frequencies, and increases with increasing frequency, at higher frequencies. PEOX-PVP-10 wt% graphene nanocomposite has the higher dielectric constant (= 16), low dielectric loss (= 0.09) and low AC conductivity (= 8.47 × 10~(-9) S/cm) at 1 kHz. This nanocomposite having good dielectric, electrical and optical properties may find use in electronic and optoelectronic applications due to its enhanced properties.
机译：由于电子应用中的效益，具有良好光学，电介质和电性能的聚合物纳米复合材料在研究中持忠诚。因此，在本发明的研究中，合成了聚（2-乙基-2-恶唑啉） - 聚乙烯基吡咯烷酮 - 石墨烯纳米烯（PEOX-PVP-GNPS）纳米复合材料，评价其性质。场发射扫描电子显微镜显微镜图像显示PEOX-PVP二进制矩阵内的GNP均匀分散。 X射线衍射分析说明了纳米复合材料的结晶度增加，随着GNP的重量百分比增加。傅里叶变换红外光谱证实了PEOX-PVP矩阵与GNP之间的分子间相互作用。 PEOX-PVP-石墨烯纳米复合材料显示光学能带隙中的降低，随着GNPS浓度的增加，URBACH能量增加。 PEOX-PVP-10wt％石墨烯纳米复合材料具有最低的带隙（= 1.2eV）和最高的URBACH能量（= 7.43eV）。随着施加的电场频率的增加，纳米复合材料的介电常数，介电损耗和切线损耗降低。另一方面，纳米复合材料的AC电导率与频率在较低频率下的频率无关，并且在较高频率下随着频率的增加而增加。 PEOX-PVP-10wt％石墨烯纳米复合材料具有较高的介电常数（= 16），低介电损耗（= 0.09），低于1kHz的低交流电导率（= 8.47×10〜（-9）S / cm）。该纳米复合材料具有良好的电介质，电气和光学性质，可以在其增强的性质中找到电子和光电应用。

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  • 来源
    《Journal of materials science》 |2020年第19期|16498-16510|共13页
  • 作者

    Shubha A.; S. R. Manohara;

  • 作者单位

    Nano-Composites and Materials Research Lab Department of Physics Siddaganga Institute of Technology (Affiliated to Visvesvaraya Technological University Belgaum) Tumakuru Karnataka 572 103 India;

    Nano-Composites and Materials Research Lab Department of Physics Siddaganga Institute of Technology (Affiliated to Visvesvaraya Technological University Belgaum) Tumakuru Karnataka 572 103 India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
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