Sulfonated poly(ether ether ketone)/poly(vinyl alcohol) sensitizing system for solution photogeneration of small Ag, Au, and Cu crystallites.

摘要: Illumination of air-free aqueous solutions containing sulfonated poly(ether ether ketone) and poly(vinyl alcohol) with 350 nm light results in benzophenone ketyl radicals the polyketone. The polymer form a quantum yield 0.02 decay second-order rate constant 6 orders magnitude lower than that typical α-hydroxy radicals. Evidence is presented polymeric reduce Ag+, Cu2+, AuCl4- to metal particles nanometer dimensions. Decreases reduction rates increasing AgI, CuII, AuIII concentrations are explained using kinetic model which ions quench excited state groups, forms macromolecular Quenching fastest for whereas Cu2+ exhibit similar constants. Particle formation becomes more complex as number equivalents needed increases; system an extreme case where radical reactions operate p...