4-8 July 2016
Kramer Law building
Africa/Johannesburg timezone
Paper Review: Initial screening in progress
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Exceptionally Crystalline TiO2 Mesocrystals with Enhanced Light Harvesting Characteristics for solar energy conversion

Presented by Dr. Aiat HEGAZY on 8 Jul 2016 from 09:40 to 10:00
Type: Oral Presentation
Track: Track A - Division for Physics of Condensed Matter and Materials

Abstract

Titanium dioxide (TiO2) is one of the most abundant compounds in our planet. It is cheap, non-toxic, highly chemically and thermally stable semiconductor material. Titanium dioxide nanoparticles (TiO2-NPs) show high visible light transparency combined with high UV light absorption. However, altering the particle size and crystalline structure of TiO2-NPs influences the absorption range, adsorption of dye molecules and electron transfer rate at the surface. Unfortunately, TiO2-NPs suffer high electron/hole recombination rates. Therefore, an ordered superstructure consisting of nanoparticles on the scale of nanometers to several micrometers is proposed; titanium dioxide mesocrystals (TiO2-MCs). In this work, we represent a new and facile way to fabricate TiO2-MCs with spherical structure by sol-gel method. We were able to fabricate spherical TiO2-NCs with narrow size distribution by controlling the hydrolysis conditions. The effect of air annealing on the morphology, size shrinkage, and phase transition of the nanoparticles was studied by scanning electron microscopy, X-ray diffraction, and Raman spectroscopy. Also, the fabricated TiO2-MCs showed exceptional photoactivity compared to their degussa p-25 nanoparticles counterparts upon their use in dye-sensitized solar cells and water splitting cells.

Award

yes

Level

N/A

Supervisor

Aiat Hegazy aiathussien@gmail.com National Research Centre

Paper

yes

Permission

yes

Place

Location: Kramer Law building
Address: UCT Middle Campus Cape Town
Room: LT1


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