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首页> 美国卫生研究院文献>ACS Omega >Colloidal N-Doped Graphene Quantum Dots withTailored Luminescent Downshifting and Detection of UVA Radiation withEnhanced Responsivity
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Colloidal N-Doped Graphene Quantum Dots withTailored Luminescent Downshifting and Detection of UVA Radiation withEnhanced Responsivity

机译：胶态N掺杂石墨烯量子点具有量身定制的发光降档和UVA辐射的检测增强响应能力

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Luminescent downshifting (LDS) materials are in great demand for their applications in light conversion devices. In this work, by an ingenious chemical approach of in situ doping, N-doped graphene quantum dots (N-GQDs) have been synthesized with tailored green photoluminescence (PL) under ultraviolet (UV) light excitation. The incorporation of N atoms in the form of pyridinic and graphitic C–N bonding into the sp2-hybridized graphitic framework of N-GQDs has led to tailored LDS via PL emissions. The LDS property of synthesized N-GQDs has been advantageously utilized to demonstrate enhanced responsivity (R) of a low-cost commercially available photoconductive cell (PC) for detection of UVA radiation through an indigenous technique. The linear optical responses of samples are optimized by varying the concentration and the dispersing medium. Also the N-GQDs are shown to be photostable in poly(vinyl alcohol) (PVA) hydrogel. A 60% enhancement in photocurrent of the PC-based photodetector under UV radiation has been obtained here by using N-GQDs/PVA as LDS material. Thus, detectionof UVA radiation with a high specific detectivity (D*) of 9 × 1013 Jones and responsivity (R) of 3 A W–1 has been demonstrated, which mightopen the opportunity of using this material in future energy conversiondevices.
机译：发光降档（LDS）材料对其在光转换设备中的应用有巨大需求。在这项工作中，通过一种巧妙的化学原位掺杂方法，在紫外（UV）光激发下，利用定制的绿色光致发光（PL）合成了N掺杂的石墨烯量子点（N-GQD）。 N-GQD的sp 2 -杂交石墨骨架中以吡啶基和石墨C–N键形式存在的N原子的掺入通过PL排放产生了定制的LDS。合成的N-GQD的LDS特性已被有利地用于证明低成本的可商购光导电池（PC）的响应度（R），以通过本地技术检测UVA辐射。通过改变浓度和分散介质可以优化样品的线性光学响应。 N-GQDs也显示在聚乙烯醇（PVA）水凝胶中具有光稳定性。通过使用N-GQDs / PVA作为LDS材料，在紫外线辐射下，基于PC的光电探测器的光电流提高了60％。因此，检测的UVA辐射具有9×10 13 Jones的高比探测率（D *）和3 A W -1 的响应度（R），这可能证明了开启在未来能源转换中使用这种材料的机会设备。

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