水热法合成荧光纳米碳点用于选择性测定Bi^(3+)

Synthesis of fluorescence carbon nanodots using one-pot hydrothermal treatment for Bi^(3+) detection

以L-蛋氨酸和乙二胺为前体,利用一锅水热法合成平均粒径约为4.98nm的碳纳米点.其表现出良好的发光性质,最佳激发波长为380nm,最佳发射波长为454nm,在200～450nm处具有紫外吸收.合成的碳纳米点荧光性能稳定,在1mol/L的NaCl溶液和常见金属离子溶液中荧光性能较为稳定,对Bi 3+具有很强敏感性,其荧光强度与Bi 3+浓度在0～30μmol/L内具有良好的线性关系,可以在此范围内用来选择性检测Bi 3+,检测限为47.6nmol.

Using L-methionine and ethylenediamine as precursors,one pot hydrothermal synthesis of carbon nanodots has been carried out.The average size of synthesized carbon nanodots was 4.98 nm and the carbon nanodots exhibit good luminescent property.The optimum excitation wavelength is 380 nm,the optimum emission wavelength is 454 nm,and the ultraviolet absorption occurs at 200-450 nm.The fluorescence property of the synthesized carbon nanodots is stable.The fluorescence property of the synthesized carbon nanodots is stable in 1 mol/L NaCl solution and common metal ions,but they are sensitive to Bi^3+.After a lot of experiments,it is found that the fluorescence intensity of the synthesized carbon nanodots has a good linear relationship with the concentration of Bi^3+within 0-30 umol/L.Above all,we consider that it can be used to selectively detect Bi^3+and the detection limit is 47.6 nmol/L.