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Effects of low gamma irradiation dose on the photoluminescence properties of graphene quantum dots

机译：低伽马辐照剂量对石墨烯量子点光致发光性能的影响

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摘要

We prepared graphene quantum dots (GQDs) using electrochemical approach. The luminescent properties of GQDs at various excitation wavelengths are examined. In order to study the possibility to improve these properties, we applied a low dose of gamma irradiation (15 kGy) on GQDs dissolved in two media: water and 4 % isopropyl alcohol solution. Upon gamma irradiation of water, various free radical species are formed and they usually cause oxidation. In the presence of isopropyl alcohol in water, during irradiation, oxygen contained radicals are quenched and only hydrogen radicals can survive and reduce the material exposed to irradiation. Morphology of GQDs is examined by atomic force and transmission electron microscopy. After gamma irradiation the increase of photoluminescence was noticed for both GQD samples. A higher intensity of photo-luminescence is detected for GQDs irradiated in 4 % isopropyl alcohol solution. This result shows that further increase of gamma irradiation dose has a great potential for improvement of luminescence properties of GQDs.
机译：我们使用电化学方法制备了石墨烯量子点（GQD）。检查了各种激发波长下GQD的发光特性。为了研究改善这些特性的可能性，我们对溶解在两种介质（水和4％异丙醇溶液）中的GQD施加了低剂量的γ辐射（15 kGy）。在伽马射线照射水后，会形成各种自由基，这些自由基通常会引起氧化。在水中存在异丙醇的情况下，在辐照过程中，含氧自由基被淬灭，只有氢自由基可以存活并减少暴露在辐照下的物质。通过原子力和透射电子显微镜检查GQD的形态。 γ辐照后，两个GQD样品均注意到光致发光的增加。对于在4％异丙醇溶液中辐照的GQD，可以检测到更高的光致发光强度。该结果表明，进一步增加γ辐射剂量具有改善GQD的发光性质的巨大潜力。

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  • 来源
    《Optical and quantum electronics》 |2016年第4期|259.1-259.7|共7页
  • 作者

    Svetlana Jovanovic; Zoran Markovic; Milica Budimir; Zdenko Spitalsky; Bojan Vidoeski; Biljana Todorovic Markovic;

  • 作者单位

    Vinca Institute of Nuclear Sciences, University of Belgrade, Mike Petrovica Alasa 12-14, Belgrade 11001, Serbia;

    Vinca Institute of Nuclear Sciences, University of Belgrade, Mike Petrovica Alasa 12-14, Belgrade 11001, Serbia,Polymer Institute Slovak Academy of Sciences, Dubravska Cesta 9, Bratislava, Slovakia;

    Vinca Institute of Nuclear Sciences, University of Belgrade, Mike Petrovica Alasa 12-14, Belgrade 11001, Serbia;

    Polymer Institute Slovak Academy of Sciences, Dubravska Cesta 9, Bratislava, Slovakia;

    Vinca Institute of Nuclear Sciences, University of Belgrade, Mike Petrovica Alasa 12-14, Belgrade 11001, Serbia;

    Vinca Institute of Nuclear Sciences, University of Belgrade, Mike Petrovica Alasa 12-14, Belgrade 11001, Serbia;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Graphene quantum dots; Photoluminescence; Gamma irradiation; Atomic force microscopy;

    机译：石墨烯量子点光致发光;伽玛射线原子力显微镜;

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