Ag K-Edge EXAFS Analysis of DNA-Templated Fluorescent Silver Nanoclusters: Insight into the Structural Origins of Emission Tuning by DNA Sequence Variations

被引：80
作者：
Neidig, Michael L. [1 ]
Sharma, Jaswinder
Yeh, Hsin-Chih
Martinez, Jennifer S.
Conradson, Steven D.
Shreve, Andrew P.
机构：
[1] Los Alamos Natl Lab, Mat Phys & Applicat Div, Ctr Integrated Nanotechnol, Los Alamos, NM 87545 USA
来源：
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY | 2011年 / 133卷 / 31期
关键词：
ABSORPTION; FLUOROPHORES; CLUSTERS; SPECTRA; MATRIX; ARGON; SIZE;
D O I：
10.1021/ja202797w
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
DNA-templated silver nanoclusters are promising biological fluorescence probes due to their useful fluorescence properties, including tunability of emission wavelength through DNA template sequence variations. Ag K-edge EXAFS analysis of DNA-templated silver nanoclusters has been used to obtain insight into silver nanocluster bonding, size, and structural correlations to fluorescence. The results indicate the presence of small silver nanoclusters (<30 silver atoms) containing Ag-Ag bonds and Ag-N/O ligations to DNA. The DNA sequence used leads to differences in silver-DNA ligation as well as silver nanocluster size. The results support a model in which cooperative effects of both Ag-DNA ligation and variations in cluster size lead to the tuning of the fluorescence emission of DNA-templated silver nanoclusters.
引用
收藏
页码：11837 / 11839
页数：3
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