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Metal nanoparticle-enhanced radiative transitions: Giving singlet oxygen emission a boost

R. Toftegaard ; J. Arnbjerg ; H. P. Cong ; Hossein Agheli (Institutionen för teknisk fysik, Biologisk fysik) ; D. S. Sutherland ; P. R. Ogilby
Pure and Applied Chemistry (0033-4545). Vol. 83 (2011), 4, p. 885-898.
[Artikel, refereegranskad vetenskaplig]

The fabrication and use of metal nanoparticles to influence electronic transitions in a given molecule is of growing interest; there is much to be gained by developing and exploiting methods to enhance weak optical signals. Singlet molecular oxygen, O-2(a(1)Delta(g)), which is an important intermediate in many oxidation reactions, particularly in biological systems, is ideally monitored by the 1275-nm O-2(a(1)Delta(g)) -> O-2(X-3 Sigma(-)(g)) phosphorescent transition. Unfortunately, the latter is highly forbidden and, as such, often presents a severe limitation in the application of this optical probe. In this paper, we describe how this weak phosphorescent transition can be enhanced by using localized surface plasmons (LSPs) from specially engineered gold nanostructures. In an attempt to elucidate the mechanism of this process, data were recorded from samples in which we decoupled the component of the plasmon resonance that absorbs incident light from the component that scatters incident light. We find that the latter appears to be the feature of significance in the process through which singlet oxygen phosphorescence is enhanced. In this work, we also illustrate how the singlet oxygen system provides an ideal model for a general study of metal-enhanced radiative rate constants.

Nyckelord: gold nanoparticles, metal-enhanced fluorescence, radiative transition, singlet oxygen, surface plasmon, gold nanoparticles, optical-properties, fluorescence intensity, colloidal lithography, plasmon resonances, nanorods, solvent, surface, phosphorescence, nanostructures



Denna post skapades 2011-05-24.
CPL Pubid: 140971

 

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Institutioner (Chalmers)

Institutionen för teknisk fysik, Biologisk fysik (2007-2015)

Ämnesområden

Kemi

Chalmers infrastruktur