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Silver/silver bromide/polypyrrole nanoparticles obtained by microemulsion photopolymerization in the presence of a cationic surfactant |
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| Authors: | Víctor M Ovando-Medina Hugo Martínez-Gutiérrez Miguel A Corona-Rivera Elsa Cervantes-González Jorge Flores-Mejía Lorena Farías-Cepeda |
| Institution: | 1. Departamento de Ingeniería Química, Coordinación Académica Región Altiplano (COARA), Universidad Autónoma de San Luis Potosí, Carretera a Cedral KM 5+600, San José de las Trojes, Matehuala, San Luis Potosi, Mexico, 78700 2. Centro de Nanociencias y micro y nanotecnologías, Instituto Politécnico Nacional, Luis Enrique Erro S/N, Mexico City, Federal District, Mexico, 07738 3. Departamento de Química, Centro Universitario de Ciencias Exactas e Ingeniería, Universidad de Guadalajara, Boulevard. M. García Barragán #1451, Guadalajara, Jalisco, 44430, Mexico 4. Departamento de Ingeniería Química, Facultad de Ciencias Químicas, Universidad Autónoma de Coahuila, Blvd. V. Carranza e Ing. José Cárdenas V. S/N, Saltillo, Coahuila, 25280, Mexico |
| Abstract: | Conductive silver/silver bromide/polypyrrole nanoparticles were obtained by photopolymerization in o/w microemulsions of pyrrole monomer in the presence of silver nitrate as electron acceptor and dopant under UV light irradiation. The microemulsions were prepared using cetyltrimethylammonium bromide (CTAB) as cationic surfactant. The particles were analyzed by scanning electron microscopy (SEM), UV/Vis, Fourier transform infrared spectroscopy, cyclic voltammetry, and X-ray diffraction (XRD). It was observed from SEM analysis that spherical particles can be obtained by this procedure with relatively narrow particles sizes distributions and average particle diameters of the silver cores (Dp) between 39 and 46 nm, which decreases as the surfactant concentration is increased. The conductivities of the resulting materials were between 0.12 and 0.40 S/m. Formation of cores of Ag and AgBr were observed from the XRD analysis, which was ascribed to the reduction of Ag+ to Ag0 and to reaction of Ag+ with the counterion of CTAB surfactant, respectively. |
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