Department of Chemistry, Indian Institute of Technology, Kharagpur-721302, India.
Langmuir. 2013 Aug 27;29(34):10945-58. doi: 10.1021/la402440z. Epub 2013 Aug 15.
A water-soluble highly fluorescent silver cluster on Au(I) surface has been synthesized with green chemistry under sunlight. The evolution of the silver cluster is synergistic, demanding gold and glutathione. The fluorescent Au(I)core-Ag(0)shell particles are huge in size and at the same time they are robust. That is why they become a deliverable fluorescing solid upon drying. Again, the giant particles run into common water miscible solvents. As a result, the fluorescence intensity increases to a great extent without any alteration of emission maxima. In this respect, acetone has been found to be the best-suited solvent. To have a universal applicability of the fluorescent clusters, the particles in the water pool of a reverse micelle have been prepared to transfer the particles into different water immiscible solvents. The comparatively lower fluorescence intensity of the particles has been ascribed to a space confinement effect. Finally, giant-cluster-impregnated yellow-orange fluorescent polymer film and fluorescent cotton wool, as well as paper substrate, have been prepared. The antibacterial activity of the fluorescent particle has also been tested involving modified cotton wool and paper substrate for Gram-negative and -positive Escherichia coli and Staphylococcus aureus, respectively.
一种水溶性高荧光银簇在金（I）表面上在阳光下通过绿色化学合成。银簇的演变是协同的，需要金和谷胱甘肽。荧光 Au（I）核-Ag（0）壳粒子尺寸巨大，同时它们非常坚固。这就是为什么它们在干燥时会变成可发射荧光的固体。同样，这些大颗粒会与常见的水溶性溶剂混合。结果，荧光强度大大增加，而发射峰没有任何变化。在这方面，已发现丙酮是最合适的溶剂。为了使荧光团具有普遍适用性，已经制备了胶束水相中存在的颗粒，以便将颗粒转移到不同的不混溶的水中。颗粒的荧光强度较低归因于空间限制效应。最后，制备了浸渍有大颗粒的黄色荧光聚合物薄膜和荧光棉以及纸基材料。还测试了荧光颗粒的抗菌活性，涉及到用革兰氏阴性和阳性大肠杆菌和金黄色葡萄球菌分别对改性棉和纸基材料进行改性。
