2017
DOI: 10.1002/ange.201709095
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On the Non‐Metallicity of 2.2 nm Au246(SR)80 Nanoclusters

Abstract: The transition from molecular to plasmonic behaviour in metal nanoparticles with increasing sizer emains ac entral question in nanoscience.W er eport that the giant 246-gold-atom nanocluster (2.2 nm in gold core diameter) protected by 80 thiolate ligands is surprisingly non-metallic based on UV/Vis and femtosecond transient absorption spectroscopyaswell as electrochemical measurements.Specifically,the Au 246 nanocluster exhibits multiple excitonic peaks in transient absorption spectra and electron dynamics ind… Show more

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Cited by 20 publications
(7 citation statements)
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“…2B and C ), 40,47 and no measurable gap was observed in electrochemical measurements. 46 According to the independent-electron theory ( eqn (4) ), there should be an ultrasmall gap in metallic Au 279 and Au 333 , as well as nonmetallic Au 246 (SR) 80 (its nonmetallicity confirmed by ultrafast spectroscopy analyses 48 ), since they are finite systems. However, ultrasmall gaps ( e.g.…”
Section: Resultsmentioning
confidence: 99%
“…2B and C ), 40,47 and no measurable gap was observed in electrochemical measurements. 46 According to the independent-electron theory ( eqn (4) ), there should be an ultrasmall gap in metallic Au 279 and Au 333 , as well as nonmetallic Au 246 (SR) 80 (its nonmetallicity confirmed by ultrafast spectroscopy analyses 48 ), since they are finite systems. However, ultrasmall gaps ( e.g.…”
Section: Resultsmentioning
confidence: 99%
“…Gold nanomaterials have attracted great interest in both fundamental science and practical applications such as sensing, catalysis, and optoelectronics owing to their unique properties [1][2][3][4][5][6][7][8][9]. For gold nanoparticles with diameters between 3-100 nm, the strong surface plasmon resonance (SPR) dominates in the absorption spectrum, which is caused by collective excitation of free electrons.…”
Section: Introductionmentioning
confidence: 99%
“…39 Noble-metal MPC molecules offer a number of advantages for the study of metallic response processes that are not available with more complex nanostructures. Atomic precision is exemplified by the recent crystallization of globular MPC molecules including Au279, 13 Au246, [40][41] and (AgAu)267, 42 each ~ 2.1-nm core being protected by aromatic thiolate ligands. These substances may be stored indefinitely without deterioration.…”
Section: Introductionmentioning
confidence: 99%