ABSTRACT:

In this presentation, Prof. Charlene Lobo will discuss her group’s recent work on nanostructure fabrication and functionalisation using a combination of thermal CVD, electron beam and plasma irradiation techniques. These techniques can also be used to accelerate reactions that occur in ambient environment, while also enabling simultaneous high-resolution imaging. Optoelectronic characterization can be carried out concurrently to electron beam experiments using in-situ Raman and confocal PL, with electrical conductance measurements using in situ Kleindiek nanoprobes. They will demonstrate high resolution electron beam etching of hexagonal boron nitride under 8 Pa water vapour in an environmental scanning electron microscope. Raman analysis demonstrates that the surrounding hBN material is not damaged by the etch process, enabling damage-free electron beam fabrication of well-defined hBN nanoribbons, holes and other geometries. Low flux electron beam exposure can be employed for creation and activation of optically active defects in diamond and hBN, such as the recently discovered blue-emitting boron vacancy single photon emitter (SPE).

Prof. Lobo will also discuss the development of magnetic sensors employing assemblies of nanodiamonds, improvements in the dynamic response and sensitivity of photodetectors based on the two-dimensional material black phosphorus, and lateral and vertical hbN devices incorporating blue SPEs. Our results demonstrate the utility of in situ electron and ion beam techniques for high-resolution, real-time imaging, functionalization and optoelectronic device fabrication of a range of two-dimensional materials.

Biography:

Professor Charlene Lobo is a professor at the School of Mathematical and Physical Sciences, University of Technology, Sydney. My career over the last 20+ years has taken me from academia (PhD and first postdoc) to industry R&D (FEI company) and back again. My starting and endpoints have been in Australia (PhD at ANU, 2001 and at UTS since 2011), but in between I’ve worked in Cambridge and London, UK; Portland, OR and Boston MA. I also had a stint as one of the launch editors of the journal Nature Materials, now the leading journal in the field of materials science and engineering.