Please use this identifier to cite or link to this item: https://doi.org/10.1021/am4007403
Title: Two-photon induced photoluminescence and singlet oxygen generation from aggregated gold nanoparticles
Authors: Jiang, C.
Zhao, T.
Yuan, P.
Gao, N.
Pan, Y.
Guan, Z.
Zhou, N.
Xu, Q.-H. 
Keywords: gold nanoparticles
plasmon coupling
singlet oxygen generation
two-photon excitation
two-photon photoluminescence
Issue Date: 12-Jun-2013
Citation: Jiang, C., Zhao, T., Yuan, P., Gao, N., Pan, Y., Guan, Z., Zhou, N., Xu, Q.-H. (2013-06-12). Two-photon induced photoluminescence and singlet oxygen generation from aggregated gold nanoparticles. ACS Applied Materials and Interfaces 5 (11) : 4972-4977. ScholarBank@NUS Repository. https://doi.org/10.1021/am4007403
Abstract: Metal nanoparticles have potential applications as bioimaging and photosensitizing agents. Aggregation effects are generally believed to be adverse to their biomedical applications. Here we have studied the aggregation effects on two-photon induced photoluminescence and singlet oxygen generation of Au nanospheres and Au nanorods of two different aspect ratios. Aggregated Au nanospheres and short Au nanorods were found to display enhanced two-photon induced photoluminescence and singlet oxygen generation capabilities compared to the unaggregated ones. The two-photon photoluminescence of Au nanospheres and short Au nanorods were enhanced by up to 15.0- and 2.0-fold upon aggregation, and the corresponding two-photon induced singlet oxygen generation capabilities were enhanced by 8.3 and 1.8-fold, respectively. The two-photon induced photoluminescence and singlet oxygen generation of the aggregated long Au nanorods were found to be lower than the unaggregated ones. These results support that the change in their two-photon induced photoluminescence and singlet oxygen generation originate from aggregation modulated two-photon excitation efficiency. This finding is expected to foster more biomedical applications of metal nanoparticles as Au nanoparticles normally exist in an aggregated form in the biological environments. Considering their excellent biocompatibility, high inertness, ready conjugation, and easy preparation, Au nanoparticles are expected to find more applications in two-photon imaging and two-photon photodynamic therapy. © 2013 American Chemical Society.
Source Title: ACS Applied Materials and Interfaces
URI: http://scholarbank.nus.edu.sg/handle/10635/77328
ISSN: 19448244
DOI: 10.1021/am4007403
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