Gold Nanoelectrodes of Varied Size: Transition to Molecule-Like Charging
作者： Shaowei Chen , Roychelle S Ingram , Michael J Hostetler , Jeremy J Pietron , Royce W Murray
DOI: 10.1126/SCIENCE.280.5372.2098
关键词: Inorganic chemistry 、 Electrode 、 Electrochemistry 、 Colloidal gold 、 Chemical physics 、 Dispersity 、 Nanoparticle 、 Particle size 、 Monolayer 、 Molecule 、 Chemistry 、 Multidisciplinary
摘要: A transition from metal-like double-layer capacitive charging to redox-like was observed in electrochemical ensemble Coulomb staircase experiments on solutions of gold nanoparticles varied core size. The monodisperse are stabilized by short-chain alkanethiolate monolayers and have 8 38 kilodaltons mass (1.1 1.9 nanometers diameter). Larger cores display responses consistent with metal-electrolyte interfaces, whereas smaller exhibit redox chemical character, including a large central gap. change behavior is new near-infrared spectroscopic data showing an emerging gap between the highest occupied lowest unoccupied orbitals 0.4 0.9 electron volt.
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