Formation of Ag‐Cu nanoparticles in SiO2 films by sol‐gel process and their effect on the film properties

Flores, Laura Lorena Díaz; Garnica-Romo, Ma. Guadalupe; González‐Hernández, J.; Yáñez‐Limón, J. M.; Vorobiev, P.; Vorobiev, Yu. V.

doi:10.1002/pssc.200674355

Cited by 9 publications

(3 citation statements)

References 9 publications

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“…In the same way recently our research group has reported the crystallization of SiO 2 sol-gel made with the introduction of the metal nitrates in the starting solution, Ag, Cu and mixtures of Ag and Cu [9,10,11,12] obtaining low temperatures of crystallization, 600 ºC for quartz in the mixture with AgNO 3 and (Cu(NO 3 ) 2 ) and 500 ºC for the α-cristobalite with the introduction of AgNO 3 .…”

Section: Introductionmentioning

confidence: 56%

Evolución estructural del sistema SiO2-Ag preparado por el proceso Sol-Gel con incorporación de partículas de Ag

Romo¹,

Torres²,

Flores³

et al. 2011

Bol. Soc. Esp. Ceram. Vidr.

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Structural evolution of Sol-Gel glasses in powder form and coatings with incorporation of Ag particles at the starting solution showed an evolution from SiO 2 amorphous matrix to the cristobalite phase with the annealing treatment at around 800 ºC for one hour. This structural evolution was obtained at lower Ag concentration up 0.7 %vol. Two series of samples were studied, A) series using HNO 3 and B) series using HCl as catalytic agent; in both series grenetine was used as a dispersing agent to avoid the precipitation of Ag particles. We found the incorporation of silver in the xerogeles matrix promotes the devitrification process at relatively low temperatures with the presence of partial crystallization in form of cistobalite. This structure was produced by controlling the catalytic agent quoted in the preparation process. The EPR and UV-Vis absorption spectra show the presence of Fe 3+ ions as a contaminant in the source of the Ag particles, due to the process to obtain these particles. By means the IR spectra a high (OH -) concentration at higher temperatures was observed in this system, until 600 ºC at difference of the sol-gel glasses made with incorporation of Ag particles by nitrates. The color evolution of the coating samples with the annealing temperature varies from a light brown at 100 ºC to yellow at 500 ºC. Keywords: sol-gel, Ag particles, cristobaliteEvolución estructural del sistema SiO 2 -Ag preparado por el proceso Sol-gel con incorporación de partículas de Ag.La evolución estructural de vidrios de Sol-Gel en forma de polvos y recubrimientos preparados con la incorporación de partículas de Ag a partir de la solución precursora muestra la evolución de la matriz amorfa de SiO 2 a la fase cristobalita utilizando tratamientos térmicos alrededor de 800 °C por un tiempo de una hora. Dicha evolución estructural fue obtenida en concentraciones bajas a partir de 0.7% de Ag. Dos series de muestras fueron estudiadas, la serie A) usando HNO 3 y la serie B) usando HCl como agente catalítico; en ambas series se uso grenetina como agente dispersante para evitar la precipitación de las partículas de Ag. Nosotros encontramos que la incorporación de plata en la matriz de los xerogeles promueve el proceso de desvitrificación a temperaturas relativamente bajas con la presencia de una cristalización parcial en forma de cristobalita. Esta estructura fue producida controlando el agente catalítico mencionado en el proceso de preparación. Los espectros de EPR y absorción UV-Vis muestran la presencia de iones Fe 3+ como un contaminante proveniente de las partículas de Ag, debido al proceso en el que fueron obtenidas las partículas. Por medio de espectroscopía IR se observo que en el sistema hay una alta concentración de (OH -) a temperaturas altas, hasta 600 ºC a diferencia de los vidrios producidos por sol-gel con la incorporación de partículas de Ag en forma de nitratos. La evolución del color en muestras con el recubrimiento con el tratamiento térmico varía de café ligero a 100 ºC hasta amarillo a 500 ºC.

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Section: Introductionmentioning

confidence: 56%

Evolución estructural del sistema SiO2-Ag preparado por el proceso Sol-Gel con incorporación de partículas de Ag

Romo¹,

Torres²,

Flores³

et al. 2011

Bol. Soc. Esp. Ceram. Vidr.

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“…According to the model suggested by L. L. Díaz-Flores et al, the near-to-metal atoms of a matrix will be in the vibrational state much different from the bulk atoms. This vibrational energy is sufficient to break the inter-atomic bonds, thus disrupting the amorphous network and reducing the kinetic barrier to the crystallization 21,22 .…”

Section: Crystallization Of Silver and Silicamentioning

confidence: 99%

Preparation and Structural Characterization of Sol-Gel-Derived Silver Silica Nanocomposite Powders

Pham¹

2014

IJMSA

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The silver embedded silica powders (Ag/SiO 2) have been successfully prepared by sol-gel method. Ag nanoparticles were formed from the thermal decomposition of the silver nitrate. X-ray diffraction shows that the silver nanocrystals have appeared after a heat-treatment at 600 °C. TEM images show that the spherical silver particles with an average size around 30 nm dispersed homogeneously in silica matrix. The data of XRD, Raman and FTIR spectroscopy prove that the formation of the silver nanocrystals influent on the structural evolution of the silica matrix. The presence of metal nanocrystals leads to remarkable decrease in crystallizing temperature of SiO 2. In addition, the adsorption-desorption analysis indicated that the growth of Ag particles makes the pores in silica structure widen.

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“…Jeon et al [118] prepared silver-doped TEOS-derived silica thin films by the sol-gel method, showing an antibacterial effect against Escherichia coli and Staphylococcus aureus. Díaz-Flores et al [119] prepared antibacterial TEOS-derived solgel thin films and microcrystalline powders doped with Ag and Cu.…”

Section: Biocidal Sol-gel Coatingsmentioning

confidence: 99%

Bioactive materials for biomedical applications using sol–gel technology

Gupta

Kumar²

2008

Biomed. Mater.

210

130

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This review paper focuses on the sol-gel technology that has been applied in many of the potential research areas and highlights the importance of sol-gel technology for preparing bioactive materials for biomedical applications. The versatility of sol-gel chemistry enables us to manipulate the characteristics of material required for particular applications. Sol-gel derived materials have proved to be good biomaterials for coating films and for the construction of super-paramagnetic nanoparticles, bioactive glasses and fiberoptic applicators for various biomedical applications. The introduction of the sol-gel route in a conventional method of preparing implants improves the mechanical strength, biocompatibility and bioactivity of scaffolds and prevents corrosion of metallic implants. The use of organically modified silanes (ORMOSILS) yields flexible and bioactive materials for soft and hard tissue replacement. A novel approach of nitric-oxide-releasing sol-gels as antibacterial coatings for reducing the infection around orthopedic implants has also been discussed.

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Formation of Ag‐Cu nanoparticles in SiO₂ films by sol‐gel process and their effect on the film properties

Cited by 9 publications

References 9 publications

Evolución estructural del sistema SiO<sub>2</sub>-Ag preparado por el proceso Sol-Gel con incorporación de partículas de Ag

Evolución estructural del sistema SiO<sub>2</sub>-Ag preparado por el proceso Sol-Gel con incorporación de partículas de Ag

Preparation and Structural Characterization of Sol-Gel-Derived Silver Silica Nanocomposite Powders

Bioactive materials for biomedical applications using sol–gel technology

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