Heat-Induced Precipitation and Light-Induced Dissolution of Metal (Ag & Au) Nanoparticles in Hybrid Film

Functionalisation of textiles by inorganic sol–gel coatings

“…114 This is in agreement with the recently observed heat-induced precipitation of silver nanoparticles at temperatures ¢120 uC in silica hybrid films. 119 The thermal reduction of silver ions is probably caused by residual alcohol within the gel layer (similar to the preparation of silver nanoparticles through alcohol reduction with organoalkoxysilanes 120 ), because silver formation is significantly less when using aqueous nanosols under the same conditions. 114 In this way there is a dramatic decrease in the release of silver ions from the coating as annealing temperature increases and the long-term biocidal activity is improved, especially after washing out processes.…”

Photoinduced degradation of fluorescence and formation of copper nanoparticles in sol–gel silica doped with flavins

“…Composites formed by metal nanoparticles in glasses have been extensively studied because of their promising applications such as photonics, nano-scale devices and catalysis as well as scientific interest [1][2][3][4][5][6][7][8][9][10]. Among the various preparation methods including ion implantation, sputtering and chemical vapor deposition, the sol-gel process has been successfully applied to metal nanoparticles [1,[4][5][6][7][8][9][10].…”

“…Among the various preparation methods including ion implantation, sputtering and chemical vapor deposition, the sol-gel process has been successfully applied to metal nanoparticles [1,[4][5][6][7][8][9][10]. Another interesting approach for the production of nanoparticles is a photo process [1,6,7,9,11].…”

Chemical composition and barrier properties of Ag nanoparticle-containing sol–gel films in oxidizing and reducing low-temperature plasmas

“…Below 500°C the treated samples were unstable in natural light as the colour changed from yellow to dark yellow after a couple of days and this was explained by the incomplete trapping of Ag + ions in the silica matrix. Shibata et al [13] prepared films by annealing the samples in N 2 flow and the stability was studied by irradiating with UV light. It was observed that the absorbance of the samples which were heat treated below 500°C decreased whilst the films heat treated at 800°C were found to be stable even after 20 h of irradiation.…”