【摘 要】
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Doping carbon dots with nitrogen atoms considerably enhances their fluorescence properties.However, the mechanism by which the carbon dots are doped is not fully understood.We developed a facile botto
【机 构】
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Institute of Oncology, Affiliated Hospital of Jiangsu University, Jiangsu University, Zhenjiang,2120
【出 处】
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2014年全国博士后新材料技术与应用学术论坛
论文部分内容阅读
Doping carbon dots with nitrogen atoms considerably enhances their fluorescence properties.However, the mechanism by which the carbon dots are doped is not fully understood.We developed a facile bottom-up hydrothermal carbonization(HTC) process that uses glucose and glycine as precursors for the synthesis of photoluminescent nitrogen-doped carbon dots.The as-prepared nitrogen-doped carbon dots were mono-dispersed spherical particles with a diameter of~2.8 nm.The doped nitrogen atoms assumed pyridinic type and pyrrolic type configurations to participate in the nanocrystal structure of the carbon dots.It appeared that the nitrogen doping introduces a new internal structure.The aqueous solution of nitrogen-doped carbon dots showed excitation wavelength-dependent multicolor photoluminescence.Further, these nitrogen-doped carbon dots readily entered the cytoplasm of A549 cancer cells and showed no significant cytotoxicity.The internalized nitrogen-doped carbon dots were localized to the cell membrane and cytoplasm, particularly around the nucleus.Further,the as-prepared, biocompatible, nitrogen-doped carbon dots demonstrated the potential to be used as fluorescent probes for multicolor live cell labeling, tracking, and imaging.
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