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Self-Assembled TiO2 Nanospheres By Using a Biopolymer as a Template and Its Optoelectronic Application

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journal contribution
posted on 28.03.2012, 00:00 by Saikat Dutta, Astam K. Patra, Sudipta De, Asim Bhaumik, Basudeb Saha
Self-assembled TiO2 nanoparticulate materials with well-defined spherical morphologies were synthesized by using a biopolymer sodium alginate as a template under different synthesis conditions. Powder X-ray diffraction (XRD), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) techniques were used to characterize the TiO2 nanoparticles. N2 sorption analysis revealed the moderately good surface area (124.0 m2 g–1) and pore volume (0.44 cm3 g–1) of these TiO2 nanoparticles. The biopolymer templating pathway leads to good-quality self-assembled TiO2 nanoparticles with dimensions of ca. 10–12 nm within the synthesis temperature range of 0–60 °C. These porous TiO2 nanomaterials showed high photogenerated current in the presence of a dye (Rose Bengal), used as a sensitizer for several photo on/off cycles.