Luminescence enhancement from silica-coated gold nanoparticle agglomerates following multi-photon excitation.
Multi-photon absorption induced luminescence (MAIL) from bare gold nanoparticles, silica-coated particles, as well as silica-coated agglomerated gold nanoparticles suspended in aqueous solution was studied by using time-resolved and steady-state luminescence spectroscopy. The nanoparticles were excited by femtosecond pulses of wavelengths ranging from 630 nm to 900 nm. The luminescence from the particles exhibits a broad spectrum in the UV and VIS region. The time-resolved measurements indicate a luminescence lifetime of a few ps, limited by the response of the experimental system. The studied dependence of the MAIL efficiency on the excitation wavelength showed that the luminescence from silica-coated agglomerates was enhanced over the whole range of excitation wavelengths, when compared to the luminescence from individual gold nanoparticles. The agglomerates show an almost excitation wavelength independent efficiency of the MAIL, while for individual nanoparticles a rapid decrease of the MAIL efficiency was observed with increasing excitation wavelength. The observed enhancement of the MAIL from the agglomerated nanostructures can be attributed to the presence of localized surface plasmon resonances in the spectral region corresponding to the excitation wavelengths. The high MAIL efficiency from the agglomerated nanoparticle structures in the near-infrared could be an advantage in the expanding field of luminescence-based-imaging, as well as in biosensor technology.
Viarbitskaya
Sviatlana
S
Department of Photochemistry and Molecular Science, Uppsala University, Uppsala, Sweden.
Ryderfors
Linus
L
Mikaelsson
Therese
T
Mukhtar
Emad
E
Johansson
Lennart B-Å
LB
Nano Lett. 2009 Apr;9(4):1651-8
19271775
Chem Rev. 2007 Nov;107(11):4797-862
17999554
Opt Express. 2008 Mar 17;16(6):4029-47
18542501
Phys Rev B Condens Matter. 1986 Jun 15;33(12):7923-7936
9938182
J Chem Phys. 2007 Sep 14;127(10):104503
17867757
Nano Lett. 2006 Aug;6(8):1822-6
16895380
Anal Bioanal Chem. 2009 Aug;394(7):1819-25
19305981
Phys Chem Chem Phys. 2009 Jul 28;11(28):5922-9
19588014
Nano Lett. 2005 Jun;5(6):1139-42
15943457
Science. 2003 Oct 17;302(5644):419-22
14564001
J Colloid Interface Sci. 2003 Aug 15;264(2):385-90
16256655
Annu Rev Phys Chem. 2003;54:331-66
12626731
Nano Lett. 2005 Apr;5(4):799-802
15826131
Chem Soc Rev. 2008 Sep;37(9):1896-908
18762838
Phys Rev Lett. 2005 Dec 31;95(26):267405
16486405