Redox Induced Fluorescence On–Off Switching Based on Nitrogen Enriched Graphene Quantum Dots for Formaldehyde Detection and Bioimaging,ACS Sustainable Chemistry & Engineering

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Redox Induced Fluorescence On–Off Switching Based on Nitrogen Enriched Graphene Quantum Dots for Formaldehyde Detection and Bioimaging
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2018-01-16 00:00:00 , DOI: 10.1021/acssuschemeng.7b02941
Hui-Jun Li ₁ , Xiong Sun ₁ , FengFeng Xue ₂ , Nanquan Ou ₁ , Bo-Wen Sun ₂ , Dong-Jin Qian ₂ , Meng Chen ₂ , Ding Wang ₁ , JunHe Yang ₁ , XianYing Wang ₁

Affiliation

Tunable optical and fluorescent properties of graphene quantum dots (GQDs) by heteroatom doping and surface functionalization provide tremendous advantages for practical applications. One of these notable issues is the construction of stimuli-responsive GQDs which can be used as smart green nonmetal materials in the field of sensor and biotechnology. In this work, N-doped graphene quantum dots (NGQDs) encapsulated by organic species were obtained through hydrothermal method, of which the quantum yield achieved 22.9%, much higher than that of bare NGQDs (1%). Interestingly, it was found that the functionalized NGQDs exhibited a color oscillation in open air and its fluorescence emission can be reversibly switched “on–off” via redox reactions. Meanwhile, the PL emission would be transformed from excitation-independent to excitation-dependent through modifying the surface states of NGQDs. The origin of PL is then studied, emphatically distinguishing the role of different C–N configurations and surface functional groups. The NGQDs of distinct optical and luminescent characteristic can serve as fluorescent sensors for detection of CH₂O and probes for bioimaging.

中文翻译：

基于富氮石墨烯量子点的氧化还原诱导的荧光开-关转换，用于甲醛检测和生物成像

通过杂原子掺杂和表面功能化，石墨烯量子点（GQD）的可调谐光学和荧光特性为实际应用提供了巨大优势。这些值得注意的问题之一是刺激响应性GQD的构建，该GQD可以用作传感器和生物技术领域中的智能绿色非金属材料。通过水热法获得了有机物包裹的N掺杂石墨烯量子点（NGQDs），其量子产率达到了22.9％，远高于裸露的NGQDs（1％）。有趣的是，发现功能化的NGQD在露天时表现出颜色振荡，并且其荧光发射可通过氧化还原反应可逆地“开-关”。同时，通过改变NGQD的表面状态，PL发射将从不依赖于激发转变为依赖于激发。然后研究PL的起源，着重区分不同C–N构型和表面官能团的作用。具有不同光学和发光特性的NGQD可以用作检测CH的荧光传感器₂ O和用于生物成像的探头。

更新日期：2018-01-16

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