【摘要】 采用水热法合成了粒径约为10nm的近似球形NaYF₄∶Yb,Er上转换荧光纳米晶.利用所合成的上转换纳米晶为荧光探针,通过荧光的内滤效应,酸性品红能有效地猝灭NaYF₄∶Yb,Er的荧光.基于此,构建了酸性品红检测传感器.实验中对孵化时间和p H等条件进行了优化.在最佳测定条件下,酸性品红浓度在13. 3×10-5～66. 7×10-5mol/L范围内与上转换纳米晶的荧光强度呈现良好的线性关系,方法的检出限为1. 7×10-5mol/L（S/N=3）,相对标准偏差为3. 6%.最后,所构建传感器用于实际水样中酸性品红的检测,获得满意的结果.更多还原

【Abstract】 Spherical NaYF₄∶ Yb,Er upconversion fluorescence nanocrystals w ith a average diameter of about 10 nm w as successfully synthesized by a hydrothermal process. The morphology and structure of NaYF₄∶ Yb,Er nanocrystals w ere characterized by FTIR,XRD and TEM techniques,meanw hile the corresponding optical properties w ere analyzed by state steady fluorescence and UV-vis absorption spectroscopy. The synthesized upconversion nanocrystals w as used as fluorescence probes,a new method for quantitative analysis of acid fuchsin is established on the basis of the inner filter effect. The incubation time and pH value w ere optimized. Under theoptimum conditions,the concentration of acid fuchsin in the range of 13. 3 × 10-5～ 66. 7 × 10-5 mol/L exhibit a good linear relationship w ith the fluorescence intensity of NaYF₄∶ Yb,Er nanocrystals. The relative standard deviation（ RSD） is 3. 6% and the detection limit for acid fuchsin is 1. 7 × 10-5 mol/L（ S/N = 3）. Finally,the constructed sensor w as successfully applied to detection of acid fuchsin in real w ater samples w ith satisfactory results.更多还原