Surface modification of submicronic TiO particles prepared by ultrasonic spray pyrolysis for visible light absorption

Dugandžić, Ivan; Jovanović, Dragana; Mančić, Lidija; Zheng, Nan; Ahrenkiel, Scott; Milošević, Olivera; Šaponjić, Zoran; Nedeljković, Jovan
October 2012
Journal of Nanoparticle Research;Oct2012, Vol. 14 Issue 10, p1
Academic Journal
Spherical, submicronic TiO assemblage with high specific surface area and controllable phase composition was prepared in the process of ultrasonic spray drying/pyrolysis in a wide temperature range (150-800 °C) by using as a precursor aqueous colloidal solution consisting of TiO nanoparticles (4.5 nm). Submicronic, soft and grained spherical TiO particles ( d = 370-500 nm) comprising clustered nanocrystals (<10 nm) were obtained at low processing temperature, while particle densification, intensive growth of the clustered primary units and anatase-to-rutile transformation (~30 wt%) were observed at the higher temperatures. Detailed structural and morphological characterisation were performed by X-ray powder diffraction, scanning and field emission electron microscopy, transmission electron microscopy, and laser particle size analysis. Moreover, the surface modification of TiO particles through the formation of charge-transfer (CT) complex was achieved with different ligands: ascorbic acid, dopamine, catechol, 2,3-dihydroxynaphthalene, and anthrarobin. Optical properties of the surface-modified TiO particles were studied by using diffuse reflection spectroscopy. The binding structure between the surface titanium atoms and different ligands was determined by using Fourier transform infrared spectroscopy. The formation of CT complexes induced significant red shift of optical absorption in comparison to unmodified TiO particles.


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