纳米硅胶颗粒的制备及其对金属离子的识别

利用sol-gel方法制得了纳米级的硅胶悬浮液.通过表面化学修饰引入了具有发射荧光能力的萘基基团.在稳态荧光研究中清晰地观察到在微小粒子表面上萘基基团会因溶剂不同而发生重新排组,并呈现出激基缔合物发光.研究了不同过渡金属离子对粒子表面荧光的猝灭效应,发现只有Cu2＋对纳米微球荧光有强烈的猝灭特征,这种优良的选择能力使其有望发展成为一种分析检测Cu2＋的荧光化学敏感器.

The Preparation of Nano-sized Silica Gel Suspension and the Recognition of Transition Metal Cations

The sol-gel method was used successfully for the preparation of na no-sized silica gel suspension.A fluorophore-naphthyl group was introduced on the surface of silica gel particles by using surface chemical modification.I n the study of steady state fluorescence spectrum,it was seen clearly that the n aphthyl groups on the particle surface were able to reorganize in different solv ents.And in a certain condition the excimer fluorescence of naphthyl group may b e observed evidently.The surface fluorescence quenching of particles by differen t transition cations was studied.It was found that only Cu2 cation showed its elf very strong ability of quenching the surface fluorescence of studied particl es.But for other metal cations almost no any quenching effect was observed.The e xcellent recognition of Cu2 cation of this system provides a possibility to d evelop a new fluorescence sensor for Cu2 cation detection.