Day 1 :
Toyota Technological Institute, Japan
Time : 10:00 - 10:30
Masamichi Yoshimura is the Professor and group leader of Surface Science laboratory at Toyota Technological Institute Nagoya Japan. He is the fellow of Surface Science Society of Japan. He has done pioneering research in the field of scanning probe microscopy high tech carbon materials. He has published over 200 papers in the international journals and delivered numerous invited and keynote lectures. He has BS, MS and PhD in Applied Physics and all from University of Tokyo Japan. He was a visiting scientist at Lawrence Berkeley National Laboratory.
Because of the excellent physical properties, carbon nano-tube (CNT) and graphene are highly expected as future functional devices in opto-electronics, nano-mechanics, etc. Here we demonstrate the controlled growth of vertically aligned CNTs (referred to as "CNT forest") and graphene. For the former growth, we used alcohol chemical vapor deposition (ACCVD) on SiO2/Si substrates. We found that the structure of CNT forests varies with catalyst thickness, where the topmost surface is capped with graphite layers when the catalyst layers are enough thick. The difference in growth behavior between Fe and Co catalysts is also presented. The growth mechanism of CNT forests are in detail investigated using SEM and Raman spectroscopy. As for graphene growth, we successfully produce a large-size single domain around 2.5 mm in diameter by reduction in the number of nucleus and enhancement of carbon diffusion. The CVD growth is done on Cu substrates using methane as a source gas. High pressure annealing is found to be effective to make the Cu surface clean and flat with step-and-terrace structure. In addition, air introduction during the growth plays a role in enhancement of diffusion of active carbons.
Darmstadt University of Technology, Germany
Time : 10:30 - 11:00
Wolfgang Ensinger studied Chemistry and Physics at the Universities in Karlsruhe and Heidelberg in Germany. He received his PhD in 1988 from Heidelberg University. Thereafter, he was a Guest Researcher at Osaka National Research Institute in Japan, Lecturer at Institute of Solid State Physics at University Augsburg and Professor of Analytical and Nuclear Chemistry at University of Marburg. Since 2004, he is a Full Professor of Material Analysis at Technical University of Darmstadt in Germany. His research topics include formation of thin films and nanostructures, including nanochannels, nanowires and nanotubes. He has authored/co-authored more than 250 peer-reviewed scientific publications.
The iNAPO-project is run by a group of materials scientists, biologists, chemists, physicists and electrical engineers. The purpose is the development of biomimetic (bio)molecular sensors based on ion conducting nanopores in polymer foils. The basic principles of fabrication and working mechanism of these nanosensors is described. PET foils are irradiated with a highly energetic single ion of a heavy element at the particle accelerator at GSI Helmholtz-Center in Darmstadt. The ion damage zone in the polymer is chemically etched into a conical pore, with the small aperture being in the nm range. The nanopore walls are functionalized with a biorecognition unit, i.e., a molecule which specifically reacts with a molecule to be analyzed. In an electrochemical cell, the foil acts as separation membrane. The electrolyte current flowing through it is measured as a function of the applied potential. In the presence of specific analyte molecules, which bioconjugate with the biorecognition unit, these ionic currents are changed. Thus, a highly sensitive nanosensor is available. The preparation and working principle of the nanosensor is described. As an example, results on protein sensing shown. The concept of the functionalized ion conducting nanopores can be applied to a large number of biorecognition couples. Within the project iNAPO, the potential of this technique will be further explored. In a step further, it is planned to embed protein-based nanopores with even better selectivity into polymer membranes. Eventually, the membranes will be incorporated in electronic micro sensing devices thus creating a new type of (bio)molecular sensors
Thin Film Physics Division, Department of Physics, Sweden
Keynote: Tailoring electronic and phononic properties at nanoscale for higher thermoelectric efficiency
Time : 11:00-11:30
Dr. Biplab Paul got his Ph. D. in 2011 from Indian Institute of Technology Kharagpur, India, where he initiated a new line of research in the area of thermoelectric. In 2011 Dr. Paul joined Universitat Autonoma de Barcelona, Spain, where he led another research line in the area of thermal rectification for practica realization of thermal diode. Presently, Dr. Paul is working in Linköping University, Sweden since 2012. His extensive studies in Linköping University has created a new research line in the area of flexible thermoelectric
The current research scenario for alternative energy sources is primarily focused on the reduction of dependency on fossil fuels, so that the harmful effects of greenhouse gases can be minimized. Thermoelectricity can contribute to this area of research by waste heat utilization for electric power generation and thus the reduction in CO2 emission. The efficiency of a thermoelectric material is defined by a dimensionless parameter thermoelectric figure of merit ZT = S2 T/, where, T, and are the absolute temperature, electrical conductivity and thermal conductivity, respectively, and S is the Seebeck coefficient or thermopower, which is defined as V/T, i.e., the voltage that develops across a sample with a temperature gradient of 1 K. High ZT requires an unusual type of material: a good electrical conductor with high thermopower, but low thermal conductivity, i.e. it must scatter phonons (to minimize lattice contribution to thermal conductivity) without troubling the transport of charge carriers, i.e., ceramic and metallic behaviors are combined to a single material system! Due to the strong interdependency of the parameters S, and the reduction of thermal conductivity without deteriorating electrical conductivity is a challenging task. Structuring material systems to the nano-dimension scale can facilitate the tailoring of phononic transport independently or quasi –independently of electronic transport and thus the manifold enhancement of ZT. The focus of the present talk is to discuss the different approaches for tailoring electronic and phononic properties in nanostructured materials at different length-scales leading to the enhancement of ZT.