Journal
NANOTECHNOLOGY
Volume 21, Issue 14, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0957-4484/21/14/145501
Keywords
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Funding
- Ministry of Environment, Korea [101-082-032]
- Korea Science and Engineering Foundation
- Ministry of Education, Science and Technology [400-2008-0230, 2009K00470]
- Sogang University
- Korean Government (MOEHRD) [KRF-2008-331-D00134]
- Korea Environmental Industry & Technology Institute (KEITI) [20081000100320] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- Ministry of Education, Science & Technology (MoST), Republic of Korea [R31-2008-000-10013-0] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [15-2008-08-001-00, 과C6A1902] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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A highly sensitive method for the selective detection and quantification of mercuric ions (Hg2+) using single plasmonic gold nanoparticle (GNP)-based dark-field microspectroscopy (DFMS) is demonstrated. The method is based on the scattering property of a single GNP that is functionalized with thiolated molecules, which is altered when analytes bind to the functionalized GNP. The spectral resolution of the system is 0.26 nm and a linear response to Hg2+ was found in the dynamic range of 100 pM-10 mu M. The method permits Hg2+ to be detected at the picomolar level, which is a remarkable reduction in the detection limit, considering the currently proscribed Environmental Protection Agency regulation level (10 nM, or 2 ppb) and the detection limits of other optical methods for detecting Hg2+ (recently approx. 1-10 nM). In addition, Hg2+ can be sensitively detected in the presence of Cd2+, Pb2+, Cu2+, Zn2+ and Ni2+, which do not interfere with the analysis. Based on the findings reported herein, it is likely that single-nanoparticle-based metal ion sensing can be extended to the development of other chemo-and biosensors for the direct detection of specific targets in an intracellular environment as well as in environmental monitoring.
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