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Download filePhotochemical Tuning of Plasmon Resonances in Single Gold Nanoparticles
journal contribution
posted on 2008-04-03, 00:00 authored by Thomas Härtling, Yury Alaverdyan, Marc Tobias Wenzel, René Kullock, Mikael Käll, Lukas M. EngWe report on the spectrally controlled photochemical tuning of the size, shape, and localized surface plasmon
resonances of individual gold nanoparticles. Single spheres, extracted from a colloidal solution, and elongated
nanodiscs, fabricated by electron beam lithography, were exposed to a gold salt solution while being illuminated
one by one by a focused 532-nm laser beam. The photochemical reduction of tetrachloroaureate complexes,
followed by the subsequent agglomeration of gold atoms at the particle surface, lead to a well-controlled
single-particle growth. This fully in situ monitored method allows us to tune the radius of single spheres as
well as the aspect ratio of single ellipsoidal particles, enabling spectral control of their respective localized
surface plasmon resonances.