Orange-red silver emitters for sensing application and bio-imaging.
Orange-red silver emitters for sensing application and bio-imaging.
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DOI：
10.1039/c5dt00928f
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发表时间：
2015-06
影响因子：
4
通讯作者：
M. Ganguly;Jayasmita Jana;Bodhisatwa Das;S. Dhara;Anjali Pal-;T. Pal
中科院分区：
文献类型：
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作者：
M. Ganguly;Jayasmita Jana;Bodhisatwa Das;S. Dhara;Anjali Pal-;T. Pal
从 AgNO3、HAuCl4 和谷胱甘肽的混合物中获得了高荧光 Au(I)@Ag 颗粒（最大发射波长为 635 nm）。当反应混合物进行改进的水热解 (MHT) 反应时，会产生含有 Ag2 和 Ag3 簇的 Au(I)@Ag 颗粒。银簇使溶液发出强烈的荧光，Au(I) 部分通过从银簇中抽出电子密度为银簇提供长期稳定性。真空干燥的荧光水溶液留下黄色固体，当重新分散在非水溶剂中时，该固体表现出更高的发射性能。荧光 Au(I)@Ag 颗粒已被发现是活细胞成像的细胞相容性和有效候选者。选择性地添加 S(2-) 离子并连续猝灭 Au(I)@Ag 颗粒的荧光，而不受常见阴离子的任何显着干扰。因此，可以使用荧光 Au(i)@Ag 颗粒在水和与水混溶的非水溶剂中灵敏地检测 S(2-)。此外，Pb(ii)诱导含有Au(I)@Ag颗粒的溶液的荧光增强已被用于使S(2-)检测不受S2O3(2-)和I(-)的干扰。肉眼检测 S(2-) 的可能性也是该方法的另一个优点，因为橙色溶液专门用 S(2-) 离子开发。对于真实环境样品，S(2-) 的荧光测定已合理化。
Highly fluorescent Au(I)@Ag particles (emission maximum at 635 nm) have been obtained from a mixture of AgNO3, HAuCl4 and glutathione. Au(I)@Ag particles containing Ag2 and Ag3 clusters are produced when the reaction mixture is subjected to a modified hydrothermolysis (MHT) reaction. The silver clusters make the solution intensely fluorescent and the Au(I) moiety provides long term stability to the silver clusters by withdrawing electron density from the silver clusters. The vacuum-dried aqueous fluorescent solution leaves a yellow solid that exhibits higher emissive properties when re-dispersed in non-aqueous solvents. Fluorescent Au(I)@Ag particles have been found to be cytocompatible and efficient candidates for live cell imaging. Addition of S(2-) ions selectively and successively quenches the fluorescence of Au(I)@Ag particles without any significant interference from common anions. Thus, sensitive detection of S(2-) is possible with the fluorescent Au(i)@Ag particles in water and water-miscible non-aqueous solvents. Furthermore, Pb(ii) induced fluorescence enhancement of the solution containing Au(I)@Ag particles has been used to enable S(2-) detection free from interference by S2O3(2-) and I(-). The possibility of naked eye detection of S(2-) is also an additional advantage of this method as an orange color solution is developed exclusively with the S(2-) ion. Fluorometric determination of S(2-) has been rationalized for real environmental samples.