Synthesis of nanostructured TiO2 thin films with highly enhanced photocatalytic activity by atom beam sputtering

Jaspal Singh1, Kavita Sahu1, Sini Kuriakose1, Nishant Tripathi2, D. K. Avasthi3, Satyabrata Mohapatra1*  

1University School of Basic and Applied Sciences, Guru Gobind Singh Indraprastha University, Dwarka, New Delhi 110078, India

2Faculty of Engineering and Technology, Jamia Millia Islamia, New Delhi 110078, India

3Inter University Accelerator Centre, New Delhi 110067, India

Adv. Mater. Lett., 2017, 8 (2), pp 107-113

DOI: 10.5185/amlett.2017.6432

Publication Date (Web): Dec 27, 2016

E-mail: smiuac@gmail.com

Abstract


Nanostructured TiO2 thin films with highly enhanced photocatalytic activity were prepared by atom beam sputtering technique. The effects of thermal annealing on the structural, morphological and photocatalytic properties of TiO2 thin films were investigated using X-ray diffraction, atomic force microscopy, field emission scanning electron microscopy, Raman spectroscopy and UV-visible absorption spectroscopy. X-ray diffraction studies showed that the as-deposited TiO2 thin films made up of anatase TiO2 nanoparticles transformed into anatase/ rutile mixed-phase TiO2 nanoparticles upon annealing. Field emission scanning electron microscopy and atomic force microscopy studies revealed growth of TiO2 nanoparticles from 16 nm to 29 nm upon annealing at 600 oC. The photocatalytic activities of the nanostructured TiO2 thin films were studied by monitoring photocatalytic degradation of methylene blue in water. Our results showed that the as-deposited nanostructured TiO2 thin films exhibited highly enhanced photocatalytic efficiency as compared to the annealed samples. The mechanism underlying the enhanced photocatalytic activity of nanostructured TiO2 thin film is tentatively proposed.

Keywords

TiO2, nanostructures, thin films, sputtering, photocatalysis.

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