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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

Official opening of Faculty of Health Sciences Rural Community Initiative
2017-01-01

Description: Karla Mostert Tags: Mail & Guardian, 200 Young South Africans, Candice Thikeson, Karla Mostert, Lerato Machetela, Mandela Rhodes Scholar, Thapelo Mokoatsi

Ribbon cutting, Prof van Zyl and Ms du Plessis
Venter (community member)

The Faculty of Health Sciences of the University of the Free State (UFS) has, as part of its commitment to student and community development, established a student residence in the town of Trompsburg in the Kopanong Local municipality, Xhariep District municipality in the Southern Free State. The Faculty officially opened the Faculty of Health Sciences Rural Community Initiative on 14 and 15 June 2017. The memorial plaque was unveiled by Prof Gert van Zyl (Dean of the Faculty of Health Sciences) and Prof Francis Petersen (Rector and Vice-Chancellor of the University of the Free State)

The importance of the residence

The goal of the ‘Kopanang le fodise – Unite to heal’ programme is to develop a community-centered collaborative framework for sustainable, holistic healthcare and social development incorporated in the curricula of the Faculty.

Background of the project

During 2016 a total of 324 fourth-year students of the Faculty have each spend at least a week in interprofessional groups in primary healthcare facilities in the Kopanong municipality on a Community Based Education, Interprofessional Education (CBE-IPE) platform in Trompsburg and Springfontein.

To facilitate student rural placement the former Midway guesthouse currently includes seven (7) facilitator units with on suite bathrooms, two (2) fully equipped lecture facilities, a recreation room and a library with computers and internet access. The newly developed student residence has 10 apartments that can each accommodate six (6) individuals. A housemaster resides on the premises and acts as manager of the facility. All areas of the residence are Wifi covered and 24h security service is in place.

The ceremony was attend by the following partners

University of the Free State (UFS)

Rector and Vice Chancellor of the University of the Free State, Prof Francis Petersen.
Members of the UFS council, Dr Vinger and Dr Swart
Dean of the Faculty of Health Sciences, Prof van Zyl.
The Head of the School of Allied Health Professions, Dr van Vuuren.
The Head of the School of Medicine, Prof Kruger.
Faculty from the Faculty of Health Sciences.
Members from UFS institutional support department: ICT, Finance, Facilities management

Kopanong local municipality

Councilor Basholo, representing the Kopanong local municipality.
Kopanong local community members
Free State Department of Education (DoE)
Free State Department of Health (DoH)

Private sector partners

Mr Burgess, CEO of MDG Heath Solutions
The Mother And Child Academic Hospital (MACAH) represented by Prof Venter, head of department of Paediatrics, donated two (2) state of the art baby scales to the rural health programme.

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