Journal of Nanomedicine & Nanotechnology

Surface modification and oxidation of vanadium thin film using femtosecond laser

7^th World Nano Conference

June 20-21, 2016 Cape Town, South Africa

Lebogang Kotsedi and F.T. Thema

University of South Africa, South Africa.
iThemba LABS-National Research Foundation, South Africa.

Scientific Tracks Abstracts: J Nanomed Nanotechnol

Abstract:

A glass substrate vacuum coated with a thin film of vanadium metal with the thickness of 500 nm was treated with a femtosecond laser. The laser was pulsing at a fundamental wavelength of 1050 nm and the repetition rate of 500 kHz, the spot size of the laser on the sample was calculated to be 45 μm. The vanadium coating was then treated with various laser fluences, this resulted in the colouration and surface modification of the sample. From the UV-VIS-NIR study the is an evidence of the formation of the vanadium oxide on the surface of the vanadium thin film, furthermore x-ray diffraction patterns of the samples shows that the microstructure of the film has changed and there are new diffraction peaks emerging that point to the oxidation of the film. The High-Resolution Scanning Electron Microscope of the sample clearly shows the evolution of the morphology of the samples due to laser treatment.

Biography :

Lebogang Kotsedi is a National Research Foundation (South Africa) research career award grant holder. He is a research fellow of the UNESCO-UNISA Africa Chair In Nanoscience and Nanotechnlogy and also memeber of the NanoAfnet network. He has a passion for photonics based research, he has recently delved in research space of photonics for sustainable energy and surface modification of transition metals using ultrafast laser. His research seeks to address and find sustainable solution to the the national stragitic research areas and other key focus area as outlines by the department of Science and Techology and the renewable energy road map of South Africa.

Email: Kotsedi@tlabs.ac.za