Journal
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
Volume 410, Issue 10, Pages 2629-2636Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s00216-018-0936-7
Keywords
Au nanoclusters; 11-Mercaptoundecanoic acid; Copper; Turn on; Penicillamine
Funding
- National Natural Science Foundation of China [21507135, 21675158, 21475134]
- Fundamental Research Funds for the Central Universities [2016ZZD06]
- Basic Research Project of Knowledge Innovation Program of Shenzhen City [JCYJ20160229165250876]
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In this study, we have developed a facile method for preparation of highly fluorescent Au nanoclusters (AuNCs) using 11-mercaptoundecanoic acid (MUA) as both the reducing and stabilizing agent. The as-prepared MUA functionalized AuNCs (MUA-AuNCs) have good water solubility, excellent photostability, and strong fluorescence emission at 610 nm with a quantum yield of 7.28% in water. The fluorescence of MUA-AuNCs was first quenched by copper ions through electron transfer, subsequently caused obvious restoration by competitive effect after adding penicillamine, making it a potential fluorescent sensor for penicillamine with a detection limit of 0.08 mu M. Furthermore, the newly designed fluorescence on-off-on assay was explored for the measurement of penicillamine in complex real water and urine samples with satisfactory results.
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