Please use this identifier to cite or link to this item: https://doi.org/10.1021/am301822v
Title: Band-selective coupling-induced enhancement of two-photon photoluminescence in gold nanocubes and its application as turn-on fluorescent probes for cysteine and glutathione
Authors: Guan, Z.
Li, S.
Cheng, P.B.S.
Zhou, N.
Gao, N.
Xu, Q.-H. 
Keywords: Au nanoparticles
biosensing
fluorescence enhancement
plasmon coupling
surface plasmon resonance
two-photon photoluminescence
Issue Date: 24-Oct-2012
Citation: Guan, Z., Li, S., Cheng, P.B.S., Zhou, N., Gao, N., Xu, Q.-H. (2012-10-24). Band-selective coupling-induced enhancement of two-photon photoluminescence in gold nanocubes and its application as turn-on fluorescent probes for cysteine and glutathione. ACS Applied Materials and Interfaces 4 (10) : 5711-5716. ScholarBank@NUS Repository. https://doi.org/10.1021/am301822v
Abstract: We have demonstrated that cysteine and glutathione induced edge-to-edge coupling of gold nanocubes (Au NCs) caused a band-selective enhancement of two-photon photoluminescence (TPPL). The photoluminescence intensity of the X-band 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 almost unchanged. This band-selective enhancement behavior is totally different from the previously observed aggregation enhanced TPPL of spherical metal nanoparticles (NPs). The band-selective enhancement was ascribed to preferential enhancement of the X-band emission through resonant coupling with longitudinal surface plasmon resonance (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-infrared excitation, this strategy has promising applications in in vivo biosensing and imaging. © 2012 American Chemical Society.
Source Title: ACS Applied Materials and Interfaces
URI: http://scholarbank.nus.edu.sg/handle/10635/75643
ISSN: 19448244
DOI: 10.1021/am301822v
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