Journal
BIOSENSORS & BIOELECTRONICS
Volume 48, Issue -, Pages 82-86Publisher
ELSEVIER ADVANCED TECHNOLOGY
DOI: 10.1016/j.bios.2013.04.002
Keywords
Mercury; Silver nanoclusters; Fluorescence; Ratiometric; Biosensors
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Funding
- University of Waterloo
- Canadian Foundation for Innovation
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Early Researcher Award from the Ontario Ministry of Research and Innovation
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DNA oligomers are particularly interesting templates for making silver nanoclusters (AgNCs) as different emission colors can be obtained by varying the DNA sequence. Many AgNCs have been used as Hg2+ sensors since Hg2+ induces fluorescence quenching. From an analytical chemistry standpoint, however, these 'light off sensors are undesirable. In this work, taking advantage of the fact that some AgNCs are not as effectively quenched by Hg2+, we design a sensor with AgNCs containing two emission peaks. The red peak is strongly quenched by Hg2+ while the green peak shows a concomitant increase, producing an orange-to-green visual fluorescence transformation. Using this AgNC, we demonstrate ratiometric detection with a detection limit of 4 nM Hg2+. This sensor is further immobilized in a hydrogel matrix and this gel is also capable of detecting Hg2+ with a visual response. (C) 2013 Elsevier B.V. All rights reserved.
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