Journal
NATURE NANOTECHNOLOGY
Volume 4, Issue 11, Pages 742-746Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NNANO.2009.258
Keywords
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Funding
- Korea Ministry of Science and Technology
- National Research Foundation of Korea [과C6A1902, 15-2008-08-001-00] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Highly selective and sensitive optical methods for the detection of metal ions have had a substantial impact on molecular biology(1-3), environmental monitoring(4-10) and other areas of research. Here we demonstrate a new method for detecting metal ions that is based on selective plasmonic resonance energy transfer (PRET) between conjugated metal-ligand complexes and a single gold nanoplasmonic probe. In addition to offering high spatial resolution due to the small size of the probe, our method is 100 to WOO times more sensitive than organic reporter-based methods(3-8). Moreover, it can achieve high selectivity owing to the selective formation of Cu2+ complexes and selective resonant quenching of the gold nanoplasmonic probe by the conjugated complexes. We expect that PRET-based metal ion sensing could have applications in cellular imaging, systems biology and environmental monitoring.
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