Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/36225
Title: Plasmonic semiconductor nanocrystals as chemical sensors : Pb2+ quantitation via aggregation-induced plasmon resonance shift
Authors: Guo, MR
Law, WC 
Liu, X
Cai, HX
Liu, LW
Swihart, M
Zhang, XH
Prasad, PN
Keywords: Plasmonics
Copper sulfide
Semiconductor nanocrystals
Heavymetal ion
Aggregation-induced detection
Issue Date: 2014
Publisher: Springer
Source: Plasmonics, 2014, v. 9, no. 4, p. 893-898 How to cite?
Journal: Plasmonics 
Abstract: We demonstrate, for the first time, the use of plasmonic semiconductor nanocrystals for the analysis of heavy metal ions in water. This highly sensitive localized surface plasmon resonance (LSPR)-based platform is built on glutathione (GSH) capped Cu2-xS nanocrystals, which exhibit LSPR at near infrared (NIR) wavelengths. Aggregation of GSH-capped Cu2-x S occurs specifically in the presence of lead ions, Pb2+, producing a shift in the LSPR absorbance peak. Under optimal assay conditions, the detection limit was as low as 0.25 mu M (52.5 ppb) of Pb2+. This provides a new plasmonic semiconductor nanocrystal-based assay for the detection of environmentally hazardous materials. The assay employs non-toxic and earth-abundant elements and could potentially be produced at much lower cost than similar gold nanoparticle-based assays.
URI: http://hdl.handle.net/10397/36225
ISSN: 1557-1955 (print)
1557-1963 (online)
DOI: 10.1007/s11468-014-9694-3
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