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| - Diameter-Dependent Optical Constants of Gold Mesoparticles Electrodeposited onAluminum Films Containing Copper
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| - Electrodeposition of gold mesoparticles on anodized and chemically etched aluminum/copper films depositedon silicon wafers proceeds by instantaneous nucleation and with no diffusion limitations. Both of thesephenomena favor the formation of relatively monodispersed gold particles. Under the reported electrodepositionconditions, the relative standard deviation of the particle diameter is 25%. The particle coverage is 7 × 108particles cm-2. The mean particle diameter varies as a function of electrodeposition time in the range of40−80 nm. Optical constants of gold mesoparticles are resolved by spectroscopic ellipsometry. A two-layeroptical model is constructed to determine both extinction coefficients and refractive indexes of goldmesoparticles as a function of the mean particle diameter. The absorption peak, associated with surfaceplasmons, is modeled with two Lorentz oscillators. Absorption peak maximums shift from 610 to 675 nm asthe mean particle diameter increases from 42 to 74 nm. Electrodeposition of gold particles on technologicallyrelevant substrates, such as aluminum/copper films, is expected to increase the utility of gold particles andfacilitate their incorporation in nanostructured materials and a variety of electronic and optical devices.
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