溶剂效应制备核壳纳米银及荧光素金属增强荧光

Core-Shell Ag Nanoparticles Synthesis from Solvent-Effect and Metal-Enhanced Fluorescence for Fluorescein

直链或支链高分子可用来制备和稳定纳米材料．具有丰富羟基的高分子通过分子间和分子内氢键作用形成分子级别的“胶囊”．用作生长纳米颗粒的模板。可溶性淀粉主要是直链淀粉．是由多个葡萄糖单元构成的含有丰富羟基的高分子．同时具有疏水性和亲水性。Raveendran等用可溶性淀粉为稳定剂．葡萄糖为还原剂制备了纳米银．Vigneshwaran等通过碘滴实验证实淀粉稳定的纳米银表面吸附淀粉分子。Star和Kim等利用淀粉有效分散和稳定单壁碳纳米管。然而淀粉包覆的纳米银还未见报道。

The starch-stabilized silver nanopartieles were synthesized in the soluble starch by glucose reduction. Further silver/starch core-shell nanoeomposites were synthesized by solvent-effect of ethanol. The scanning electron microscope micrographs showed that the diameter of silver core is about 40 nm and the thickness of starch layer is around 20 nm. The fluorescence of fluorescein was enhanced in the addition of core-shell nanocomposites.