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Evolution from the plasmon to exciton state in ligand-protected atomically precise gold nanoparticles
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Evolution from the plasmon to exciton state in ligand-protected atomically precise gold nanoparticles
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Journal Article
Evolution from the plasmon to exciton state in ligand-protected atomically precise gold nanoparticles
2016
Overview
The evolution from the metallic (or plasmonic) to molecular state in metal nanoparticles constitutes a central question in nanoscience research because of its importance in revealing the origin of metallic bonding and offering fundamental insights into the birth of surface plasmon resonance. Previous research has not been able to probe the transition due to the unavailability of atomically precise nanoparticles in the 1–3 nm size regime. Herein, we investigate the transition by performing ultrafast spectroscopic studies on atomically precise thiolate-protected Au
25
, Au
38
, Au
144
, Au
333
, Au
∼520
and Au
∼940
nanoparticles. Our results clearly map out three distinct states: metallic (size larger than Au
333
, that is, larger than 2.3 nm), transition regime (between Au
333
and Au
144
, that is, 2.3–1.7 nm) and non-metallic or excitonic state (smaller than Au
144
, that is, smaller than 1.7 nm). The transition also impacts the catalytic properties as demonstrated in both carbon monoxide oxidation and electrocatalytic oxidation of alcohol.
Little is known about the transition of a metal nanoparticle from the plasmonic to excitonic state. Here, the authors map this evolution in atomically precise gold nanoparticles, a critical step for understanding the origins of surface plasmon resonance, metallic bonding, and catalytic behaviour.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Portfolio
