发光碳量子点的光谱特性及其潜在的分析应用

本文用微波法合成了具有发光特性的CDs．当反应温度与时间为30℃、10min条件下，CDs能发射强而稳定的荧光（F）与室温磷光，其F既能被十六烷基三甲基溴化铵（CTAB）、曲拉通X-100（Triton X-100）、Na2S、Na2C2O4、NH3·H2O等增强，又能被十二烷基硫酸钠（SDS）、KBrO3、K2S2O8、NalO4、Vc、NaBH4、HNO3、HCl、H2SO4、CH3COOH等猝灭，同时伴随着发射波长（λem^max）不同程度的蓝移或红移；pH在2．0-7．0范围内体系对CDs的F值发生灵敏响应，其线性回归方程为F=106．0＋27．76pH，相关系数（R）为0．9913；多数金属离子使CDs的F猝灭，Fe（Ⅲ）能催化KBrO3氧化CDs的反应，且Fe（Ⅲ）浓度在2．5—90．0ngmL^-1范围内与体系的荧光变化（△F）呈线性关系，其线性回归方程为△F=72．54＋0．3577mFe（Ⅲ），（ngmL^-1），R为0．9911．这些信息揭示了CDs在荧光法、荧光免疫法和室温磷光法中有较高的分析价值，同时为pH传感器的开发提供新的途径．

Spectral Properties of Luminescent Carbon Dots and Their Potential Analytical Application

This paper is trying to describe the current research situation of carbon dots （CDs）, and the results show that the simple, rapid and high yield synthetic methods for CDs have become the trend of development, the main characterization method of CDs is transmission electron microscopy （TEM） and their application in biological science has become a hot subject in the present study. At 30 ℃ for 10 min, the CDs prepared with microwave could emit strong and stable fluorescence （F） and room temperature phosphorescence, and the F of CDs not only could be enhanced by hexadecyltrimethylammonium bromide （CTAB）, TritonX-100, Na2S, Na2C2O4 and NH3.H2O, but also could be quenched by sodium dodecyl sulfate （SDS）, KBrO3, K2S2O8, NalO4, Vc, NaBH4, HNO3, HCl, H2SO4, CH3COOH and most metal ions, with the Zeromax blue or red shift in varying degrees. The F of CDs is sensitive to pH in the range of 2.0-7.0, with the linear regression equation being F = 106.0 ＋ 27.76 pH and correlation coefficient （R） of 0.9913. Besides, Fe（Ⅲ） could catalyze KBrO3 oxidizing CDs and the concentration of Fe（Ⅲ） was in the linear relationship with the change of the fluorescence intensity （AF） in the range of 2.5-90.0 ng mL^-1 with the linear regression equation being △F = 72.54 ＋ 0.3577 mFe（Ⅲ） （ng mL^-1 ） and R of 0.9911. The results reveal that CDs would play an important role in fluorometry, fluororesence immunoassay and room temperaturephosphorimetry and a new way to develop pH sensor has been proposed.