The interaction between plasmonic metal nanocrystals and
semiconducting materials gives rise to very interesting phenomena, including
fluorescence enhancement and fluorescence quenching, resulting in various
bioanalytical applications. Here we report the utilizing of a DNA molecular
ruler to modulate the plasmonic enhancement of gallium arsenide (GaAs)
photoluminescence with gold nanoparticles. A well-defined nanostructure was
first developed based on controlled assembly of the gold nanopaticles on the
GaAs surface using DNA scalfold as a bridge at tunable intramolecular distance.
Then, we demonstrated the DNA length-dependent fluorescence enhancement of GaAs
with gold nanoparticles is mainly attributed to the surface plasmon coupling
effect. This finding suggests the great promise of the DNA-modulated coupled
plasmonics in the development of more efficient optical sensing and
devices.
Keywords: Gallium arsenide; plasmonics; photoluminescence; DNA; gold nanoparticles
Source: Sciencedirect
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