以柠檬酸三钠为原料,尿素为掺杂剂,采用水热法合成了一种荧光量子产率为66.23%的氮掺杂碳纳米点。采用透射电镜、X射线衍射、红外光谱、X射线光电子能谱等手段对其物化性质进行分析;采用紫外吸收光谱、365nm紫外灯、荧光发射光谱进行光学性质分析。结果表明:氮掺杂碳纳米点颗粒分散且粒径均一,平均粒径2.43nm,晶面间距0.22nm;在365nm光源照射下,其溶液呈强蓝荧光,最大激发波长和发射波长分别为365nm和425nm。Fe3+对氮掺杂碳纳米点溶液的荧光有猝灭效应,在酸性环境中氮掺杂碳纳米点溶液的荧光也有猝灭。
Using trisodium citrate as raw material and urea as dopant,nitrogen(N)-doped carbon dots with fluorescence quantum yield of 66.23% was synthesized by hydrothermal method.TEM,XRD,FI-TR,XPS were used to analyze the physical and chemical properties of N-doped carbon nanodots.Ultraviolet absorption spectroscopy,365nm ultraviolet lamps,and fluorescence emission spectra were used to analyze their optical properties.The results showed that the prepared N-doped carbon nanodots were dispersed and uniformed in particle size,with average particle size of 2.43nm and interplanar spacing of 0.22nm.Under the irradiation of 365nm light source,the N-doped carbon nanodots solution showed strong blue fluorescence,with the maximum excitation and emission wavelengths of 365nm and 425nm,respectively.Fe3+ had quenching effect on the fluorescence of the N-doped carbon nanodots solution,and the fluorescence of the N-doped carbon nanodots solution can also be quenched in acidic environment.
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基金资助
国家自然科学基金(51966008)
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