Document Detail


Band-selective Coupling-induced Enhancement of Two-photon Photoluminescence in Gold Nanocubes and Its Application as Turn-on Fluorescent Probes for Cysteine and Glutathione.
MedLine Citation:
PMID:  23033805     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
We have demonstrated that cysteine and glutathione induced edge-to-edge coupling of Au NCs, which caused a band selective enhancement of two-photon photoluminescence. The intensity of X band of photoluminescence of Au NCs was found to be enhanced up to 60-fold and 46-fold upon addition of cysteine and glutathione respectively, while the intensity of L band remained nearly unchanged. This band-selective enhancement behavior is totally different from the previously observed aggregation enhanced two-photon photoluminescence of spherical metal nanoparticles. The band selective enhancement was ascribed to preferential enhancement of the X band emission through resonant coupling with longitudinal SPR band of the Au NCs assembly. This phenomenon was utilized to develop a new two-photon fluorescence turn-on sensing platform for detection of cysteine and glutathione. This method displayed high sensitivity and excellent selectivity over the other 19 amino acids. Together with the advantage of deep tissue penetration and localized excitation of two-photon near-IR excitation, this strategy has promising applications in in-vivo bio-sensing and imaging.
Authors:
Zhenping Guan; Shuang Li; Pei Boon Cheng; Na Zhou; Nengyue Gao; Qing-Hua Xu
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-10-4
Journal Detail:
Title:  ACS applied materials & interfaces     Volume:  -     ISSN:  1944-8252     ISO Abbreviation:  ACS Appl Mater Interfaces     Publication Date:  2012 Oct 
Date Detail:
Created Date:  2012-10-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101504991     Medline TA:  ACS Appl Mater Interfaces     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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