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Title: Size-dependent two-photon excitation photoluminescence enhancement in coupled noble-metal nanoparticles
Authors: Han, F.
Guan, Z.
Tan, T.S.
Xu, Q.-H. 
Keywords: fluorescence enhancement
metal nanoparticles
multiphoton excitation
plasmon resonance
size dependence
two-photon excitation photoluminescence
Issue Date: 26-Sep-2012
Citation: Han, F., Guan, Z., Tan, T.S., Xu, Q.-H. (2012-09-26). Size-dependent two-photon excitation photoluminescence enhancement in coupled noble-metal nanoparticles. ACS Applied Materials and Interfaces 4 (9) : 4746-4751. ScholarBank@NUS Repository.
Abstract: Plasmon coupling is known to enhance the two-photon excitation photoluminescence of metal nanoparticles significantly. Here, Au and Ag nanospheres of different sizes were prepared to systematically investigate the effects of particle size on plasmon coupling enhanced two-photon excitation photoluminescence. An oppositely charged polyelectrolyte, poly(diallyldimethylammonium chloride) (PDDA), was used to induce the coupling of Au and Ag nanospheres. The two-photon excitation photoluminescence enhancement factor was found to first increase and then decrease with the increasing particle size for both Au and Ag nanospheres. Optimum enhancement factors of 25-fold and 14-fold were obtained for coupled 55-nm Au nanospheres and 50-nm Ag nanospheres, respectively. The coupled Au and Ag nanospheres displayed two-photon action cross sections of up to 9 × 10 4 GM per particle (where 1 GM = 10 -50 cm 4 s/photon). Similar to Ag nanoparticles, Au nanoparticles also displayed large coupling induced enhancement of two-photon excitation photoluminescence. Considering their excellent biocompatibility, high inertness, and easy preparation, Au nanoparticles are expected to find many new applications in two-photon biosensing and bioimaging. © 2012 American Chemical Society.
Source Title: ACS Applied Materials and Interfaces
ISSN: 19448244
DOI: 10.1021/am301121k
Appears in Collections:Staff Publications

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