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Blue and Red Shifts of Interband Transition Energy in Supported Au Nanoclusters on SiO<sub>2</sub> and HOPG Investigated by Reflection Electron Energy-Loss Spectroscopy
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2012
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EngineeringNanoclusterInterband Transition EnergySupported Au NanoclustersMetallic NanomaterialsChemistryElectronic StatesHopg InvestigatedNanoscale SciencePlasmonic MaterialMaterials ScienceCluster SciencePhysicsNanotechnologyEnergy-loss SpectroscopyNanomaterialsNatural SciencesApplied PhysicsGold Nanoclusters
Gold nanoclusters supported on SiO2 and HOPG are experimentally investigated by the reflection electron energy-loss spectroscopy. Two different trends in the size-dependence of the position of the energy-loss peak corresponding to the interband Au 5d --> 6s6p transition is observed: a blue shift for Au clusters on SiO2 and a red shift for Au clusters on HOPG. The different behaviors are qualitatively explained by the influence of the substrate on the spectrum of electronic states in Au nanoclusters.