Seminar Professor Marian Cholewa
- When?
- Friday 18 November 2011, 14:00 to 15:00
- Where?
- ATI seminar room - 02ATI02
- Open to:
- Staff, Students
- Speaker:
- Professor Marian Cholewa - Rzeszow University of Technology, Poland
Development and applications of new nanomaterials for high speed, high efficiency and high resolution radiation detectors FP7-PEOPLE-2012-ITN
This talk will describe proposed works towards a development and applications of new materials with superior secondary electron emission (SEE) and new class of detectors for radiation. This will be the subject of a submission of a proposal for FP7-PEOPLE-2012-ITN in January 2012.
Detectors for X-rays, ions and electrons play an important role in both science and industry. During the past 50 years, methods of detection and measurement of ionizing radiation have undergone a significant evolution with new detectors frequently based on newly developed materials and technologies such as diamond, high purity germanium, and Peltier cooling of the devices.
The SEE yield of heterostructures of ZnO nanoneedles coaxially coated with AlN or GaN has been studied for the first time using electron, ion, and X-ray beams. The SEE yield of the heterostructures is enhanced significantly by the intrinsic nanostructure of the ZnOnanoneedle templates as compared to the AlN and GaN thin films on Si substrates. These findings open up a way to develop new universal highly efficient radiation detectors based on the SEE principle by incorporating these one-dimensional (1D) nanostructures as a material of choice.
A similar idea was previously developed for carbon foils, boron-doped diamond and is now proposed for nanomaterials. Series of experiments have been performed with different radiation including electrons, ions and X-rays to better understand processes governing the SEE in 1D nanostructured materials. So far two international patents have been awarded for these works.
