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Opportunities in Low Temperature Plasmas at York

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We have a number of PhD studentships available in low-temperature plasmas. Please see the Departmental Postgraduate Study pages for details. For further information on positions and related topics contact: Erik Wagenaars. Please apply online

We always welcome applications from individuals wishing to pursue independent fellowships

PhD Projects

Tailoring plasma chemistry of cold atmospheric-pressure plasmas

Supervisor: Dr Erik Wagenaars

Funding status: Awaiting Funding

 

Project description

Plasma technologies already form a key part of many of today’s multi-billion pound industries such as the nanoscale fabrication of microprocessors, energy efficient lighting, production of solar cells and the deposition of advanced functional coatings. Underpinning the effectiveness of these essential technologies is the unique non-equilibrium environment created within the plasma; including a mix of reactive neutral particles, ions and energetic electrons. Many applications rely on the synergistic interaction between the mix of species created in the plasma and a sample surface; however one of the fundamental challenges in plasma science is tailoring the mixture of reactive plasma species such that they have the desired effect on a target.

Novel cold atmospheric-pressure plasmas can operate into open air, remain at room temperature, and still have the selective desired reactivity characteristics. They have many novel applications ranging from plasma medicine to adhesion enhancement of plastics to green chemistry. As with many plasma applications, key for the effectiveness of these devices is the plasma chemistry, i.e. exactly what mix of reactive species are delivered to a substrate by the plasma.

The chemistry in these plasmas is largely controlled by the electrons; more precisely the distribution of energies that the electrons have. Different electron energy distribution functions (EEDF) drive differences in the plasma chemistry and therefore in the observed effect on a surface, making the EEDF, and especially control over the EEDF of key importance.

Compared to traditional low-pressure plasmas, atmospheric-pressure plasmas are generated at much higher pressure (in open air), meaning there are many more collisions between plasma particles, severely hindering existing low-pressure EEDF control methods. This project aims to take advantage of a newly developed extremely agile high-voltage pulsed power technology, in which pulse characteristics such as rise time, duration and repetition rate can be varied by the user. With this flexibility, the electrical excitation of the discharge can be used to modify the EEDF and therefore control and tailor the plasma chemistry of the APP. Sophisticated (laser-based) plasma diagnostics and numerical modelling will enable us to understand the underpinning mechanisms of the observed changes in chemistry for different pulse shapes. Air-based chemistries, in particular reactive species such as OH, NO, O3, O and N play key roles in many applications and are the focus of this project.

Postdoctoral Opportunities

With its international reputation and impact, and its rich variety of plasma science, the York Plasma Institute offers an outstanding research environment to help researchers make the best possible start to their careers. Please take a look at our Fellowship pages for potential funding.

Unfortunately there are no positions currently available, please check the University vacancy pages for other potential opportunities