Polymer-Directed
Growth of Plasmonic Aluminum Nanocrystals
Posted on 2018-10-30 - 15:34
The challenge of
controllable chemical synthesis of aluminum nanocrystals
(Al NCs) has been met with only limited success. A major barrier is
the absence of effective ligands to control the nucleation and growth
of Al NCs. Here we demonstrate the size- and shape-controlled synthesis
of monodisperse Al NCs using a polymer ligand, cumyl dithiobenzoate-terminated
polystyrene (CDTB-PS). Density functional theory (DFT) calculations
indicate that CDTB-PS shows selective absorption on Al{100} facets,
inducing the formation of nanocubes and trigonal bipyramids. An excess
of CDTB-PS, however, decreases the supersaturation of Al atoms, leading
to the formation of {111} facet-terminated octahedral and triangular
plates. The concentration of the catalyst, titanium (IV) isopropoxide,
determines the size of Al NCs by controlling the number of seeds. Depending
on nanoparticle size, the solutions of Al NCs possess distinct colors,
a characteristic feature of plasmonic nanomaterials. This robust and
controlled chemical synthesis of Al NCs lays a foundation for Al as
a sustainable plasmonic material for current and future applications.
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Lu, Shaoyong; Yu, Hua; Gottheim, Samuel; Gao, Huimin; DeSantis, Christopher J.; Clark, Benjamin D.; et al. (2018). Polymer-Directed
Growth of Plasmonic Aluminum Nanocrystals. ACS Publications. Collection. https://doi.org/10.1021/jacs.8b08937
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AUTHORS (12)
SL
Shaoyong Lu
HY
Hua Yu
SG
Samuel Gottheim
HG
Huimin Gao
CD
Christopher J. DeSantis
BC
Benjamin D. Clark
JY
Jian Yang
CJ
Christian R. Jacobson
ZL
Zhongyuan Lu
PN
Peter Nordlander
NH
Naomi J. Halas
KL
Kun Liu