Journal
BIOSENSORS & BIOELECTRONICS
Volume 44, Issue -, Pages 16-20Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2013.01.005
Keywords
Gold nanoclusters; Polyelectrolyte; Fluorescence; Reusable sensor; Copper ion
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Funding
- NSF of China [21175010, 21127007]
- MOST of China [2010DFA12780]
- Fundamental Research Funds for the Central Universities [FRF-BR-11-005A, FRF-SD-12-030A]
- SRF for ROCS, SEM
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In this paper, we reported a facile method of fabricating a reusable fluorescent Cu2+-sensor. To fabricate the reusable sensor, the bovine serum albumin-protected gold nanoclusters (BSAGNCs) were complexed with polyelectrolytes, i.e., positively charged polydiallyldimethylammonium (PDDA) and negatively charged polystyrenesulfonate (PSS), and were coated on a glass slide. The prepared film-modified glass slides exhibited the recyclability of fluorescent signal off-on behaviors: the fluorescence could be switched off by immersing the film sensors in Cu2+ solution and on by washing with ethylene diamine tetraacetic acid (EDTA) solution. The prepared film-modified glass slides exhibited high selectivity towards Cu2+ the fluorescence quenching behavior in the form of the Stern-Volmer equation. In addition, the spiked tap water samples were analyzed with satisfactory results. These demonstrations provide a new convenient approach to develop the BSAGNCs-based, reusable fluorescence sensors. (C) 2013 Elsevier B.V. All rights reserved.
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