Nano Archive

NANO-RODS WO3-δ FOR ELECTROCHROMIC SMART WINDOWS APPLICATIONS

Sibuyi, P (2006) NANO-RODS WO3-δ FOR ELECTROCHROMIC SMART WINDOWS APPLICATIONS. Masters thesis, University of the western cape.

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Abstract

Tungsten oxide is a good electrochromic material which has been used in the construction of smart windows through visible modulation. These smart materials can reversibly change their optical properties with the application of an external voltage. Their ability to lighten and darken on command is ideally suited for energy-efficiency windows. The process itself or the overall reaction should respond in seconds and as quick as possible. First generation electrochromic devices based on cathodic WO3 in a laminated design employing a polymeric electrolyte have been produced and studied extensively. Now, Tungsten oxide as a major component in this technology has to be reengineered to enhance the dynamics of its optical modulation: porous nano-scaled WO3 with high shape anisotropy such as nanorods are potential candidates. In this work the tungsten oxide nanorods are being synthesized by a thermal evaporation technique and further investigated. The nanorods have been successfully grown on planar substrate of Si(001), Mica and Corning glass at the temperature of about 850°C. High resolution Scanning Electron Microscopy has been used as a primary characterization tool to study their growth. The optical and electrochromic properties were studied in detail by UV-VIS-NIR spectroscopy and cyclic voltametry. The properties of deposited WO3 nanorods are presented comparing it with the reported results for a standard electrochromic material.

Item Type:Thesis (Masters)
Subjects:Material Science > Nanofabrication processes and tools
Material Science > Nanostructured materials
Physical Science > Photonics
Divisions:Faculty of Engineering, Science and Mathematics > School of Physics
ID Code:7267
Deposited By:Dr Balla Diop Ngom
Deposited On:18 Oct 2009 22:29
Last Modified:18 Oct 2009 22:29

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