Latest News Archive

Please select Category, Year, and then Month to display items
Previous Archive
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

UFS responds to revocation of the accreditation of the SA Doping Control Laboratory by WADA
2017-07-01

The World Anti-Doping Agency (WADA) yesterday informed the South African Doping Control Laboratory (SADoCoL) at the University of the Free State (UFS) that the WADA accreditation status of the laboratory has been revoked.

This revocation does, however, not include the analysis of blood samples for the Athlete Biological Passport for which SADoCoL has been re-accredited in August 2016 and which the laboratory will continue to perform. It also does not impact at all on the testing of urine sport samples by the South African Institute of Drug-free Sport (SAIDS), who will continue to send such samples for testing to other WADA accredited laboratories, while blood samples will be tested at SADoCoL as before.

The revocation follows a year long period of suspension in which the laboratory had to develop its analytical capabilities and instate new systems and methodologies.  “In this period the laboratory worked diligently to realize all of these requirements and according to an inspection team from the WADA Laboratory Expert Group who visited the laboratory in February 2017, much has been done and the Laboratory is in a much better state than it was before the suspension in May 2016,” says prof Marthinus van der Merwe, Director of SADoCoL.

“However, there were certain aspects of these requirements that the laboratory could not achieve within the time-frame stipulated by WADA and therefore the organisation is bound by its rules and regulations to now revoke the accreditation status of the laboratory. Since much effort and resources have been invested in the laboratory in the last two years, the management of SADoCoL together with senior leadership of the UFS decided to go ahead and finalise all development in order to re-apply for WADA accreditation,” says prof van der Merwe. 

“The UFS fully acknowledges the hard work of SADoCoL during the period of development and is committed to support the laboratory in its endeavors to re-attain its status within the very specialised and highly regulated community of world-wide doping control laboratories.  The premium goal of the laboratory is still to fully serve the sporting community of South Africa and Africa according to the WADA guidelines for anti-doping control in Sport and it is confident to attain that with the support of all role players in this field,” says Prof Witthuhn, Vice-Rector: Research at the UFS.

Released by:
Lacea Loader (Director: Communication and Brand Management)
Telephone: +27 51 401 2584 | +27 83 645 2454
Email: news@ufs.ac.za | loaderl@ufs.ac.za
Fax: +27 51 444 6393

We use cookies to make interactions with our websites and services easy and meaningful. To better understand how they are used, read more about the UFS cookie policy. By continuing to use this site you are giving us your consent to do this.

Accept