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4-Methoxyphenyl grafted onto graphene quantum dots surface via diazonium chemistry method

机译：通过重氮化学方法将4-甲氧基苯基接枝到石墨烯量子点表面

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摘要

Chemical modifacation is effective method to change surface state of graphene quantum dots (GQDs). GQDs modified with various functional groups exhibit multicolor photoluminescence (PL). Here, 4-methoxyphenyl (MP) group, with electron donating methoxy as substituent on aromatic ring, was grafted onto GQDs surface via a diazonium chemistry method. After modification, the average diameter of GQDs was decreased from 3.3 to 2.5 nm, and their PL was blue-shifted 40 nm relative to raw GQDs (R-GQDs). The result is similar to that of GQDs modified with phenyl (P), 4-carboxyphenyl (CP), 5-sulfonaphthyl (SN) and 4-sulfophenyl (SP), which are aryl groups without substituent and with electron withdrawing substituent, previously. Therefore, properties of substituent groups located at aryl do not obviously change PL behavior of aryl-modified GQDs.
机译：化学修饰是改变石墨烯量子点（GQDs）表面状态的有效方法。用各种官能团修饰的GQD表现出多色光致发光（PL）。在此，通过重氮化学方法将具有供电子性甲氧基作为取代基的4-甲氧基苯基（MP）基团接枝到GQDs表面。修改后，GQD的平均直径从3.3纳米减小到2.5纳米，并且它们的PL相对于原始GQD（R-GQD）蓝移了40纳米。结果类似于先前用苯基（P），4-羧基苯基（CP），5-磺基萘基（SN）和4-磺基苯基（SP）修饰的GQD，它们是没有取代基并且具有吸电子取代基的芳基。因此，位于芳基的取代基的性质不会明显改变芳基修饰的GQD的PL行为。

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  • 来源
    《Optical and quantum electronics》 |2018年第7期|269.1-269.6|共6页
  • 作者

    Peihui Luo; Xiangfeng Guan; Yunlong Yu; Xiaoyan Li;

  • 作者单位

    Organic Optoelectronics Engineering Research Center of Fujian’s Universities, College of Electronics and Information Science, Fujian Jiangxia University;

    Organic Optoelectronics Engineering Research Center of Fujian’s Universities, College of Electronics and Information Science, Fujian Jiangxia University;

    Organic Optoelectronics Engineering Research Center of Fujian’s Universities, College of Electronics and Information Science, Fujian Jiangxia University;

    Organic Optoelectronics Engineering Research Center of Fujian’s Universities, College of Electronics and Information Science, Fujian Jiangxia University;

  • 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; Chemical modification; Carbon materials; Luminescence;

    机译：石墨烯量子点;化学修饰;碳材料;发光;

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