Day 1 :
IFW Dresden, Germany
Time : 10:00
Oliver G Schmidt is a Director at the Leibniz Institute for Solid State and Materials Research Dresden, Germany, and holds a full Professorship for Material Systems for Nanoelectronics at the Chemnitz University of Technology, Germany. His scientific activities are focused on nano- and micro-materials and bridge across interdisciplinary research fields, ranging from nanoelectronics and microrobotics to energy storage devices and biomedical applications. He has received several awards: the Otto-Hahn Medal from the Max-Planck-Society in 2000, the Philip-Morris Research Award in 2002 and the Carus-Medal from the German Academy of Natural Scientists Leopoldina in 2005. In 2010, he was awarded the Guinness World Record® for the smallest man-made jet engine and in 2011 he became Honorary Professor at Fudan Shanghai University. He received the International Dresden Barkhausen Award 2013, and since 2014 is the Chair of a new center for “Materials, Architectures and Integration of Nanomembranes (MAIN)”. He has published more than 600 papers in peer-reviewed journals and has given more than 250 invited talks worldwide.
Nanomembranes are thin, flexible, transferable and can be shaped into 3D microtubular nanomembrane architectures. This makes them attractive for a broad range of applications and scientific research fields ranging from novel hybrid heterostructure devices to ultra-compact 3D systems both on and off the chip. If nanomembranes are differentially strained they deform themselves and roll-up into microtubular structures upon release from their mother substrate. Rolled-up nanomembranes can be exploited to rigorously compact electronic circuitry and energy storage units. They can also serve as ideal platform to study novel photonic and plasmonic phenomena. As rolled-up microtubes can be easily tuned into the size range of single cells, they are perfectly suited to study single cell behavior in ultra-sensitive yet fully integrative lab-in-a-tube systems. As off-chip components, they address exciting environmental and biomedical applications such as biomimetic regenerative cuff implants or powerful self-propelling micro-autonomous systems. If magnetic tubes or helices are combined with spermatozoa, such hybrid micro-bio-robotic motors offer new perspectives towards paradigm shifting reproduction technologies.
Riga Technical University, Latvia
Keynote: A three-stage mechanism of ZnO nanoparticles formation at the surface of ZnO crystal by laser radiation
Time : 10:35
Arturs Medvids obtained the degree Dr. Habil. Phys., specializing in Solid State Physics at Latvian University, Riga. He has been the Head of Laboratory of Semiconductor Physics at Riga Technical University since 1989. He was a Professor at the Institute of Technical Physics of Riga Technical University since 1995. In 2001, he worked in Japan as an Invited Professor in Shizuoka University. He was awarded the title of Honourable Guest Professor of Shizuoka University, Japan, in 2009, 2014 and 2016. He has published more than 560 scientific publications which includes papers, conference proceedings, books and patents.
A three-stage mechanism of ZnO nanoparticles formation at the surface of ZnO crystal by the forth harmonic of Nd:YAG laser radiation is proposed. The first stage is intensive generation and concentration of Zn interstitials at the irradiated surface of ZnO crystal by the laser. The second stage is agglomeration of Zn interstitials to Zn nanoparticles with the size depending on the number and intensity of laser pulses. The third stage is transformation of the Zn nanoparticles into ZnO nanoparticles due to oxidation of Zn nanoparticles in atmospheric environment using the same laser radiation. An evidence of Zn phase formation in ZnO crystal is appearance of 70 cm-1 band in Raman spectra after irradiation by the first and the second laser pulse. A new broad band at 561 cm-1 in Raman spectra is observed after irradiation by 5 laser pulses. The intensity of the band increases with the number of laser pulses and at the same time the intensity of the 70 cm-1 band decreases until it disappears. The nature of the band is connected with oxidation of Zn nanoparticles. It is the third stage of ZnO nanoparticles formation. Comparison analysis of the proposed laser method with the conventional methods of nanoparticles formation in semiconductors will be carried out.