近年来上转换发光材料在荧光标记中由于其独特的优势引起人们极大的关注。但在某些应用过程中出现分散性不好和易于沉降的缺点,影响了它作为荧光探针的应用。为了改善这种状况,制备了一种由二氧化硅包覆的上转换发光材料。并用红外光谱、扫描电镜、透射电镜等手段对材料进行了表征。结果表明二氧化硅已经包覆到上转换材料上,并且在实验条件下制备的产物粒径较小,颗粒为均匀的球形,二氧化硅包覆层厚度大约为10 nm。实验还对包覆条件进行了探索,得到最佳实验条件为:试验选用正丁醇作溶剂,体积为100 mL;用氨水作分散剂;催化剂水和正硅酸乙酯的量的比应是1∶1,反应时间为40 m in。
A new method was reported for surface modification of an up-conversion luminescence material with hydrosulfide group. The factors that may influence the surface modification,such as reaction time,amount of catalyzer and modifier,and reaction solvent,were investigated. The optimal conditions were that the reaction time,the quantity of the basic catalyzer,the quantity of modifier and the volume of reaction solvent were 40 min,1.0,1.0,and 40 mL,respectively. The results indicated that hydrosulfide group content modified on the surface of up-conversion luminescence material reached to 0.1430 mmol/g,and this modified up-conversion luminescence material could be widely used in the study of structure of protein and the property of microenvironment.
