期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 396, 期 -, 页码 63-68出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2013.01.031
关键词
Gold nanoclusters; Papain; Fluorescence; Label free; Cu2+ detection
资金
- Chinese Academy of Sciences
- National Natural Science Foundation of China [21075119, 91027036]
- National Basic Research Program of China (973 Program) [2011CB911002]
- Changchun Municipal Bureau of Science and Technology [2011225]
- State Key Laboratory of Supramolecular Structure and Materials [SKLSSM201215]
Highly fluorescent papain stabilized gold nanoclusters (NCs) have been synthesized through a simple wet chemical route. Papain was used for the first time as an effective capping and reducing agent for these clusters. The optimal conditions for the synthesis of the gold nanoclusters, including the concentrations of papain and NaOH, reaction time and temperature, were investigated. The as-prepared Au clusters show intense red emission at similar to 660 nm (QY similar to 4.3%) and are uniform in size. The clusters are quite stable and the intense red emission remained unchanged at a buffer pH range of 6-12. The fluorescent Au NCs were then used as a label-free probe for the sensitive detection of Cu2+. A limit of detection of 3 nM was obtained. The sensing strategy is also highly selective against the various potential interference ions. (C) 2013 Elsevier Inc. All rights reserved.
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