The synthesis of Langmuir—Blodgett films containing cobalt ferricyanide nanoparticles

Abstract

Langmuir—Blodgett films, modified by electrochemically active compound such as cobalt ferricyanide, are interesting for creating a film electrodes with high concentrations of active center and low response time which are insoluble in water. In this article we have shown the possibility of introducing which was stabilized by sodium hexametaphosphate in monolayers of octadecylamine for their further transfer to the solid substrate by the Langmuir—Blodgett method. Cobalt ferricyanide nanoparticles were prepared by gradual mixing an equimolar mixture of the reactants with the addition of sodium hexametaphosphate as the stabilizer. The size of nanoparticles was determined by dynamic light scattering, the size of most of them was about 12 nm. The stability of the nanoparticles in the range of pH = 2 ÷ 4 was investigated by photometric research. Surface pressure isotherms for octadecylamine on subphase, which contain cobalt ferricyanide nanoparticles, were studied at pH = 2 ÷ 4. According to the results optimum conditions for transporting monolayers onto a solid substrate by the Langmuir—Blodgett method was selected. Refs 5. Figs 2.