Green Synthesis and Reversible Dispersion of a Giant Fluorescent Cluster in Solid and Liquid Phase

详细信息    查看全文

• 作者：Mainak Ganguly ; Jaya Pal ; Sancharini Das ; Chanchal Mondal ; Anjali Pal ; Yuichi Negishi ; Tarasankar Pal
• 刊名：Langmuir
• 出版年：2013
• 出版时间：August 27, 2013
• 年：2013
• 卷：29
• 期：34
• 页码：10945-10958
• 全文大小：1017K
• 年卷期：v.29,no.34(August 27, 2013)
• ISSN：1520-5827

文摘

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鈥揂g(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.