The valence-band electronic structure of alkanethiol stabilized gold nanoparticles (NPs) with different core sizes has been studied using x-ray photoemission spectroscopy. A reduction of density of state near the Fermi level is observed for small particles (<30.3em0exnm0.2em0exdiam) that are separated by more than 10.3em0exnm. A significant cross-coupling between the particles is found when their separation is decreased below 10.3em0exnm that restores the density of states at the Fermi edge. The observations are interpreted as a result of changes in the screening of Coulomb blockade effects in the NP system due to tunneling between particles at the shorter separations.
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Liu et al. (2005) studied this question.
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