Group Seminar 2022/23
- Date
- Wednesday 16 November 2022, 14:00-15:00
- Location
- Chemistry SR 1.53g
- Speaker
- Dr Laura Clark
- Institution
- University of Leeds, School of Chemical and Process Engineering
- Title
- Using electron microscopy to reveal materials properties – what we can see, and what we can’t see (yet)
- Category
- Group Seminar
Abstract:
Scanning transmission electron microscopes (STEMs) have been able to image individual atoms since 1970 (Crewe), and by the end of the 1970s, these instruments were also able to image longer range electro-magnetic fields within samples (e.g. Chapman, 1978). From these two aspects, one might think that all of structural and functional materials imaging is solved in electron microscopy. Alas, this is not quite true: the limitations of these methods include imaging thick samples (which induce multiple scattering), imaging at low electron dose for easily damaged materials (including graphene, photovoltaics, pharmaceuticals – many important classes of sample!), imaging weak long-range fields (as found in some p-n junctions) and resolution limiting experimental aberrations.
In this seminar, I will give an overview of my recent work in methods development towards overcoming each of these hurdles and towards a goal of full materials characterisation in the electron microscope – before an outlook towards the new imaging capabilities coming online by allying new developments in instrumentation with new development in imaging algorithms.