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Experimental and theoretical inquiry into optical properties of graphene derivatives

机译：石墨烯衍生物光学性质的实验与理论探讨

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Graphene oxide (GO), a functional derivative of graphene, is a promising nanomaterial for a variety of optoelectronic applications as it exhibits fluorescence and maintains many of graphene's beneficial physical properties. although other graphene derivatives are chemically plausible and may serve to the benefit of the aforementioned applications, GO remains the one heavily used. the nature of optical behavior of other graphene derivatives has yet to be fully understood and studied. in this work we develop a variety of graphene derivatives and characterize their optical properties concomitantly suggesting a unified model for optical emission in graphene derivatives. in this process we examine the influence of different functional groups on the surface of graphene on its optoelectronic properties. mildly oxidized graphene (oxo-g(1)), nitrated graphene, arylated graphene, brominated graphene, and fluorinated graphene are obtained and characterized via TEM and EDX, FTIR and fluorescence spectroscopies with the latter indicating a potential band gap-derived fluorescence from each of the materials. this suggests that optical properties of graphene derivatives have minimal functional group dependence and are manifested by the localized environments within the flakes. this is confirmed by the hyperchem theoretical modeling of all aforementioned graphene derivatives indicating a similar electronic configuration for all, assessed by the pm3 semi-empirical approach. this work can further serve to describe and predict optical properties of similar graphene-based structures and promote graphene derivatives other than GO for utilization in research and industry.
机译：氧化石墨烯（GO）是石墨烯的一种功能衍生物，由于其具有荧光性并保持了石墨烯的许多有益物理性质，是一种很有前途的纳米材料，可用于各种光电应用。尽管其他石墨烯衍生物在化学上是合理的，并且可能有利于上述应用，但GO仍然是一种被大量使用的衍生物。其他石墨烯衍生物的光学性质尚未得到充分的理解和研究。在这项工作中，我们开发了多种石墨烯衍生物，并对其光学性质进行了表征，同时提出了石墨烯衍生物中光发射的统一模型。在此过程中，我们研究了石墨烯表面不同官能团对其光电性能的影响。通过TEM和EDX、FTIR和荧光光谱对轻度氧化石墨烯（oxo-g（1））、硝化石墨烯、芳基化石墨烯、溴化石墨烯和氟化石墨烯进行了制备和表征，后者显示了从每种材料获得的潜在带隙荧光。这表明石墨烯衍生物的光学性质具有最小的官能团依赖性，并通过薄片内的局部环境来体现。上述所有石墨烯衍生物的超化学理论模型证实了这一点，该模型表明所有石墨烯衍生物都具有类似的电子结构，并通过pm3半经验方法进行了评估。这项工作可以进一步描述和预测类似石墨烯结构的光学性质，并促进石墨烯衍生物在研究和工业中的应用。

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