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首页> 外文期刊>CERAMICS INTERNATIONAL >Synthesis of fluorescent graphene quantum dots from graphene oxide and their application in fabrication of GQDs@AgNPs nanohybrids and sensing of H2O2
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Synthesis of fluorescent graphene quantum dots from graphene oxide and their application in fabrication of GQDs@AgNPs nanohybrids and sensing of H2O2

机译：石墨烯氧化物的荧光石墨烯量子点的合成及其在GQDSα纳米布里制造中的应用及H2O2的感应

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摘要

Graphene oxide (GO) with hydrophilic properties supports the scalable production of highly desirable material graphene. GO nanosheets were prepared with a modified Hummers method, whereas the oxidative cutting technique was used to synthesize graphene quantum dots (GQDs). The surface and structural morphology of both GO and GQDs were examined and compared. In GO, photoluminescence originated mainly due to the conductive electrons present in the sp(2) localized sites and the excimer formation. In contrast, in GQDs, PL is increased due to numerous defects present on their surfaces. The pH plays a crucial role in tuning the blue and green PL of GQDs hence the optical properties. The developed GQDs with functional groups act as a solo reducing and stabilizing agent in producing the GQDs-silver nanoparticles (GQDs@AgNPs) hybrid structure, which exhibits strong surface plasmon resonance along with GQDs absorption. Further, GQDs alone support sensing of hydrogen peroxide (H2O2) in an aqueous medium, thus acting as a sensing probe like the GQDs@AgNPs nanohybrids.
机译：具有亲水性的氧化石墨烯（GO）支持高度理想材料石墨烯的可扩展生产。GO纳米片是用改进的Hummers方法制备的，而氧化切割技术则用于合成石墨烯量子点（GQD）。研究并比较了GO和GQD的表面和结构形态。在GO中，光致发光主要源于sp（2）局域位置中的导电电子和准分子的形成。相比之下，在GQD中，由于其表面存在大量缺陷，PL增加。pH值在调节GQD的蓝色和绿色光致发光中起着至关重要的作用，因此GQD的光学性质也是如此。开发的带有官能团的GQD可以作为单独的还原剂和稳定剂来制备GQD银纳米颗粒(GQDs@AgNPs)杂化结构，表现出强烈的表面等离子体共振和GQDs吸收。此外，GQD单独支持水介质中过氧化氢（H2O2）的传感，因此充当类似于GQDs@AgNPs纳米杂交。

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