A STUDY OF OPTICAL BAND GAP ON TITATINUM DIOXIDE NANOPARTICLES LAYERS
Bulk TiO2 is a wide band gap (3.2 eV) semiconductor with interesting electronic and optical properties with a wide range of applications. Engineering the Bandgap of TiO2 thin films is highly important for many applications. Quantum Dots (QD) are nano-sized particles whose electronic properties are similar to that of molecules rather than bulk materials. We managed to engineer optical band gap of anatase thin films by using layer-by-layer assembly. The thin layers were prepared on glass substrate by spin coating techniques using commercially available colloidal TiO2 nanoparticles of average size 10 – 15 nm. The samples were characterized by UV–visible spectroscopy and the optical band gap were determined using Tauc’s relation. The band gaps of thin films were varied from 3.8 eV to 3.4 eV merely due increase of film thickness from 0.24 to 1.84 μm by layer-by-layer assembly. Financial support from UWG SEEP and SRAP programs are acknowledged.
Preston, J,; Johnson, W.; and DeSilva, L. Ajith
"A STUDY OF OPTICAL BAND GAP ON TITATINUM DIOXIDE NANOPARTICLES LAYERS,"
Georgia Journal of Science: Vol. 75
, Article 81.
Available at: http://digitalcommons.gaacademy.org/gjs/vol75/iss1/81
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