We demonstrate the facile synthesis of high purity aluminum nanocrystals over a range of controlled sizes from 70 to 220 nm diameter with size control achieved through a simple modification of solvent ratios in the reaction solution. The monodisperse, icosahedral, and trigonal bipyramidal nanocrystals are air-stable for weeks, due to the formation of a 2-4 nm thick passivating oxide layer on their surfaces. We show that the nanocrystals support size-dependent ultraviolet and visible plasmon modes, providing a far more sustainable alternative to gold and silver nanoparticles currently in widespread use.
McClain, MJ; Schlather, AE; Ringe, E; King, NS; Liu, L; Manjavacas, A; Knight, MW; Kumar, I; Whitmire, KH; Everitt, HO; Nordlander, P; Halas, NJ
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