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27 July 2021 | Story Leonie Bolleurs | Photo UFS Photo Archive
Prof Hendrik Swart played a key role in the Department of Physics acquiring the PHI Quantes XPS system, the first in Africa and one of only 20 in the world.

The state-of-the-art equipment in the Department of Physics at the University of the Free State (UFS) differentiates this department from its competitors. Availability of the equipment makes it possible for researchers as well as students to deliver work that receives national and international recognition. 

Recently, the department acquired a PHI Quantes XPS system, the first in Africa and one of only 20 in the world. 

Creating better phosphor 

“The Quantes XPS system uses X-rays to determine the chemical composition of molecules on the surface of a sample. The system is unique in the sense that it also has an extra X-ray source that can determine the chemical state below the surface, which was not possible in the past.  This will help us to dictate the position of defects in our phosphor materials that will consequently enable us to create better phosphor for solid state lighting as well as solar cell applications,” explains Prof Hendrik Swart, Senior Professor in the Department of Physics, who also holds the SARChI Chair in Solid State Luminescent and Advanced Materials.

After he had the opportunity to observe the system in the factory in Chigasaki, Kanagawa, Japan, where he attended a conference, Prof Swart was very impressed by its performance. He discussed it with Prof Koos Terblans, Head of the department, and other colleagues, and started making plans to buy the system. 

When the department first bought the X-ray photoelectron spectroscopy (XPS) system in 2007/2008, it became the national facility on XPS measurements. Not only is this an upgrade of the XPS system bought 14 years ago, but the new system will enable the department to do more measurements. “The number of samples that we have to handle has just become too much for one system. The new system’s increased capacity for making measurements addresses this challenge and it also gives UFS scientists and postgraduate students more time to spend on fundamental measurements to develop research of a higher level,” says Prof Swart.

(The Quantes XPS system. Photo:Supplied)

Explaining about the measurements, Prof Swart says: “This advanced X-ray photoelectron spectroscopy (XPS) instrument has the capability to analyse the very small area that the user is interested in and a large area of the uniform sample surface. The two different types of X-ray sources – the hard X-ray source and the more conventional soft X-ray source – can be switched automatically, allowing users to analyse the same area and/or points of a sample. The PHI Quantes XPS system ensures the availability of superior features such as automatic analysis, automatic sample transfer, turnkey charge neutralisation, and advanced data processing.”

“This XPS instrument is designed to pioneer new methods and applications transcending conventional ideas of what is possible.”

Optimising efficiency of materials

Prof Swart says the Department of Physics, especially the Research Chair in Advanced and Luminescent Materials, is developing new high-technology materials on a daily basis. “It is very important to know the chemical composition and defect distribution of the materials in order to add value to the fabrication of these materials,” he adds.

“The distribution of these defects is vital for the efficiency of the phosphor materials. If we know where these defects are located, we can determine the mechanisms of the light output coming from these phosphors,” describes Prof Swart.

Research conducted as part of the Research Chair in Solid State Luminescent and Advanced Materials will benefit significantly from this new system.

(Prof Koos Terblans, Head of the Department of Physics next to the Quantes XPS system. Photo:Supplied) 

“We are currently concentrating on phosphors as sensors (temperature), light-emitting diodes (LEDs), and solar cells, where we optimise the efficiency and durability of these materials. Any new knowledge, which I believe the PHI Quantes XPS system will provide us, will help us to reach our goal much quicker,” he says. 

Apart from the positive impact on research, the PHI Quantes XPS system will also be a benefit to society in the long term. Improved LEDs can be used to save electricity, and better solar cells can help to generate electricity, to mention but two examples. 

News Archive

Miss Deaf SA inspires UFS teachers with her life story
2009-11-26

Pictured from the left, are: K. Botshelo, Vickey Fourie (Miss Deaf SA) and A. Morake.

Vicki Fourie, Miss Deaf SA 2009 and Miss Deaf HESC, recently visited the University of the Free State to motivate aspiring Foundation Phase teachers by sharing her life story with them.

When Vicki was two years old, her parents found out that she couldn’t speak. Two possible explanations were that she had had an ear infection or speech problems. They took her to a specialist and after a brain scan they found out that Vicki had 97% hearing loss in both ears.

Hearing aids were required and Vicki’s father, Pastor Gerhard Fourie from the Christian Revival Church (CRC) enrolled her in a kindergarten school for deaf children, Carel Du Toit in Cape Town.

However, even though Carel Du Toit’s slogan is ‘Where Deaf Children Learn to Speak’, it was because of her mother’s efforts that Vicki is able to communicate effectively with hearing people today.

Bonita Fourie would sit with her child every single day and teach her how to pronounce words phonetically and how to read lips. It is because of that that Vicki is not dependent on sign language at all.

When she was seven years old, her parents enrolled her in an English A.C.E. school. Even though Vicki’s home language is Afrikaans, her parents decided to go against the norm by placing her in an English school (most deaf/hard of hearing people cannot learn a second language). Today Vicki is fluent in both languages.

“I used to think that my hearing aids are just a normal thing you put on, like using glasses for reading,” she said. “I still think that way. People always come up to me and say, ‘It’s amazing how easily you adapt to hearing people. You have no stumbling blocks or holdbacks.’

“To me it’s interesting because my reaction is always this: ‘God gave me this situation, and I have made the best of it. I’ve overcome it, and therefore I can go forward in life’. We were born not to survive, but to thrive. I detest the attitude of, ‘I’m a victim, so the world owes me something’. The world owes nobody anything! We can be victorious over our own circumstances. It is possible. My name’s meaning is testifies to this: “Vicki” comes from the word “Victory”. I was meant to be victorious, and not a victim.”

Vicki, who is now 20, has achieved so much in life. She did ballet, hip-hop, modern dancing, drama (she even went to America for her dramatic monologue and poetry recitation), and she has published over 70 magazine articles, nationally and internationally. Her dreams are to write books one day, become a TV presenter, and motivate and inspire people all over South Africa through public speaking.

When one hears this story, one cannot help but be surprised by her success. It makes you realize that anything is possible when you see the potential in a child, and then do everything in your power to develop it and draw it out. When you believe in the child that you are educating, that child will sense it and blossom like a flower.

“Courage isn’t a gift, it is a decision,” Vicki said. “There will always be things that try to hold you back. The key to working with any child is to be patient, patient, and patient! Teachers play a huge role in equipping children for the future. It is a big responsibility, but it can be done.”
 

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