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A convenient sol-gel route for the synthesis of salicylate-titania nanocomposites having visible absorption and blue luminescence
Authors:Atanu Mitra  Asim Bhaumik  Mahasweta Nandi  B.K. Roy
Affiliation:a Department of Materials Science, Indian Association for the Cultivation of Science, Jadavpur, Kolkata 700032, India
b Haldia Government College, Purba Medinipur 721657, West Bengal, India
Abstract:Syntheses of titania-based nanomaterials by simple sol-gel route using a mixture of CTAB and salicylate as well as salicylate ions as templates have been reported. The materials are characterized by the powder X-ray diffraction (XRD), thermal analysis, transmission electron microscopy (TEM), scanning electron microscopy (SEM) and spectroscopic (FT IR, UV-VIS) analyses. A disordered mesoscale orientation of nanoparticles (ca. 2-4 nm) composed of TiO2-salicylate surface complex has been obtained when 1:1 mixing ratio of CTAB and salicylate at the CTAB concentration of 0.001 M was employed as a template. All these nanocomposites exhibit a considerable red shift at the onsets of their absorption band compared to pure (organic-free) nanocrystalline TiO2 and show blue luminescence at room temperature. This assembly of nanoparticles is highly interesting in the context of visible light sensitization and nanodevice fabrication.
Keywords:CTAB-salicylate   LMCT band   Luminescence   Nanoparticle-assembly   Nanostructure   Titania
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