Abstract
Photochemical methods, based on the highly reducing capability of excited-state ethylenediaminetetraacetic acid and 1-hydroxy-1-methylethyl radical, are described to achieve the controlled formation of metallic silver particles in the size range 5–20 nm. It is possible to support isolated particles on uniform spherical latex spheres. Strong optical absorption extending to more than 800 nm is found for these systems in the relatively low pH range between 4 and 6. At pH > 9, characteristic spectra associated with small silver particles, with peak maxima around 405 nm, are observed. These results are consistent with the formation of pH-dependent metal complexes.
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