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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

Colloquium focuses on rural education
2012-10-10

Some of the international delegates during the second annual colloquium on rural education recently held at the Qwaqwa Campus.
10 October 2012

 The second edition of the Sustainable Rural Learning Ecologies (SuRLEc) Colloquium was held at the University of the Free State's Qwaqwa Campus this week. This three-day international event provided the Faculty of Education's postgraduate students with a platform to present their research and to learn from experienced researchers from all over the world.

In his opening address, the Faculty's Programme Head, Dr Dipane Hlalele, challenged all delegates to translate their research into achievable goals to address all the challenges facing rural education.

"Excellence in teaching and learning in a rural context remains a challenge for all sectors and levels of the education endeavour," Dr Hlalele said.

"Urban and metropolitan schools, colleges and universities may unintentionally structure their learning programmes in such a manner that they neglect rural attributes. This results in the marginalising of learners and students from rural environments. To complete the loop, these institutions are more likely to fail in preparing graduates for decisive contributions to sustainable rural learning ecologies," Dr Hlalele added.

The colloquium was officially opened by the Vice-Rector: External Relations, Dr Choice Makhetha, who highlighted the fact that the UFS was already doing its bit in levelling the learning playfields in higher education.

"We are aware that many of our students who come from disadvantaged backgrounds find it hard to cope at university. As a result, we are not waiting for them to come through to us. We are already in partnership with a number of schools where we help learners to improve their results," Dr Makhetha said.

The crucial role played by rural teachers was celebrated during a gala dinner to honour and acknowledge their efforts despite a myriad of daily challenges.

Ms Jabulile Mabaso (The Mills Primary Farm School) was honoured for 'Excellence in multi-grade teaching in Foundation and Intermediate phases'. Ms Rekha Mathew (Sibonakaliso Primary Farm School) and Mr Andries Motsoere (Tshebedisano Primary Farm School) were awarded for 'Excellence in managing multi-grade curriculum'.

The 2012 SuRLEc Honorary Award went to Ms Motshedisi Damane for her valuable contribution to the development of rural education in the Thabo Mofutsanyana Education District. Last year's recipient was the Dean of the Faculty of Education, Professor Dennis Francis.

Delegates and keynote speakers came from Thailand, Malaysia, the Unites States of America as well as the SADC countries of Botswana, Zimbabwe and Lesotho. South Africa was represented by the Universities of the North-West, Limpopo, KwaZulu-Natal and CUT, amongst others.

 

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