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A reformative oxidation strategy using high concentration nitric acid for enhancing the emission performance of graphene quantum dots

机译:一种使用高浓度硝酸的改良氧化策略,以增强石墨烯量子点的发射性能

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摘要

A high concentration nitric acid oxidation strategy has been presented for one-step fabrication of strongly red-emitting fluorescent graphene quantum dots (GQDs) using activated carbon as a carbon source. In optimal conditions, the emission quantum yield at 600 nm wavelength is as high as 18%. The concentration of the used nitric acid is critical to the optical properties of the GQDs: concentrated nitric acid (14.6 M) can more sufficiently oxidize GQDs' surface and more efficiently dope the N element, resulting in a longer emission band and higher emission efficiency. Preliminary cell image study indicates the obtained GQDs possess a high signal to background ratio, good stability and low cytotoxicity, which endow their promise as a new type of near-infrared fluorophores for biological applications.
机译:已经提出了一种高浓度硝酸氧化策略,用于使用活性炭作为碳源一步制造强红色发光的荧光石墨烯量子点(GQD)。在最佳条件下,在600 nm波长处的发射量子产率高达18%。所用硝酸的浓度对GQD的光学性能至关重要:浓硝酸(14.6 M)可以更充分地氧化GQD的表面并更有效地掺杂N元素,从而产生更长的发射带和更高的发射效率。初步的细胞图像研究表明,所获得的GQD具有较高的信噪比,良好的稳定性和较低的细胞毒性,这使其有望作为一种新型的生物应用近红外荧光团。

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