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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

Top matriculants for Kovsies
2014-01-24

 

 
From left are: Saneliswe Khambule, Lungile Mkhungo, Jannie de Wet, Anje Venter, Siqiniseko Buthelezi and Abrille Beukes.
Photo: Hannes Pieterse

Hailing from top schools in KwaZulu-Natal (KZN), Naushad Mayat, Lungile Mkhungo and Siqiniseko Buthelezi share 20 distinctions between them. Leaving the province of the Zulu Kingdom for Bloemfontein, all three are at Kovsies to study as doctors.

Naushad obtained eight distinctions, an achievement that placed him in the top ten matriculants in KwaZulu-Natal. The former learner from Glenwood High School in Durban came fourth in the Umlazi District and tenth overall in the province. Enrolling for a degree in Medicine, he will join the list of outstanding health professionals Kovsies produce every year.

Lungile, who matriculated from Kingsway High School, attained seven distinctions and her average percentage was 90%. She received distinctions in English – 90%, IsiZulu – 94%, Mathematics – 83%, History – 92%, Physics – 89%, Life Sciences – 89% and Life Orientation – 93%. Lungile is not only clever, but also performed well in sports at her school, participating in netball, soccer and athletics. This future doctor is a proud resident of Wag-'n-Bietjie residence. 

Siqiniseko made history at his school, Maritzburg College, becoming the first black Head Prefect at the 150-year-old school, the oldest boys' high school in KZN and one of the oldest schools in South Africa. A gifted learner excelling in sport, culture and academics, Siqiniseko obtained five distinctions (English, Afrikaans, Life Orientation, Accounting and Life Sciences). His sporting prowess has seen him captaining Maritzburg College's first rugby team, as well as the KZN Academy team.

The three are joined by fellow KwaZulu-Natal resident, Saneliswe Khambule, Namibian Abrille Beukes and Free Staters Anje Venter and Jannie de Wet.

Saneliswe, a former learner of Menzi High School in Umlazi, received five distinctions in her final-year exams. The Emily Hobhouse resident registered for a Forensic Science degree and plans on doing her doctoral studies in this exciting career field.

Abrille Beukes is another future doctor and is all the way from Windhoek in Namibia. Abrille obtained a ‘one’ in all her subjects, the highest possible mark in the Namibian school system. The Windhoek-born student received high levels in Mathematics, Accounting, Physical Science, Biology, Afrikaans and English. As second best student in her home country, she will register for a Medicine degree.

Anja, the Free State’s top achiever, received an average percentage of 93% in the matric final exams. The former Eunice student obtained nine distinctions, an achievement that placed her in the national top 100 matriculants.  Anja enrolled for a BSc Actuarial Science degree and will be joined in class by former school friend, Jannie de Wet, who obtained a whopping ten distinctions. Jannie and Anja attended Universitas Primary School together, with Jannie finishing his school career at Jim Fouché High School, and just like Anja, he will also enrol for a BSc Actuarial Science degree.

Jannie obtained distinctions in Afrikaans, English, Mathematics, Mathematics (third paper), Life Orientation, Accounting, Physical Science, Life Science, Economics and Information Technology. Jannie is also the Volksblad and the University of the Free State’s 2013 Matriculant of the Year.

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