Day 2 :
Kunsan National University, South Korea
Keynote: Preparation and fabrication studies of three dimensionally ordered nano - micro and meso-scale calcium phosphate crystallites scaffold for artificial bone materials (3-DOMm)
Time : 09:00-09:30
Myung Chul Chang has completed his PhD at Seoul National University and Postdoctoral studies at University Illinois at Urbana Champaign. He is the Director of Biomaterials Lab. He has published more than 50 papers in reputed journals and has been serving as an Editorial Board Member of reputed journals.
Preparation and fabrication studies of three dimensionally ordered nano-, micro- and meso-scale calcium phosphate crystallites scaffold for artificial bone materials (3-DOMm): In clinical surgeon for humane bone replacement the artificial bone materials have been developed on a basis of biomechanical capability and nontoxic ability. Since 1987 the calcium phoaphte bone materials have been developed, showing proper mechanical strength, bioability and bone regeneration in bone metabolism. From several years ago global companies such as Stryker, ETEX and Biomet-Merck have commercially introduced the calcium phosphate bone products. The structure of humane bone is known to be the nanocomposites between collagen and hydroxyapatite. Biomimetic bone science have studied for the clinically possible surgical application of calcium phosphate bone. The primary study was how to mimic porous bone scaffold in calcium phosphate/collagen matrix. The second issue was how to attain the mechanical property of real humane bone. In first generation of artificial bone development acrylic polymer such as PMMA was mostly used because of the good mechanical strength in spite of serious toxic problem during surgery. Since calcium phosphate cement [CPC] bone has been introduced as bone regeneration, there was a big problem in clinical application because of low mechanical strength. Polymer modification study into CPC cement has been tried. We have focused on the development of pure calcium phosphate products having proper mechanical strength similar to real humane bone. The bioregeneration ability was shown and new syringe design was introduced for the clinical surgeon. We have been keeping the study of calcium phosphate science and engineering technology in bone metabolic condition. All of phosphate research are based on monodispersed control of nano-, micro-, and meso-scale for the bone scaffold application.
Osaka University, Japan
Time : 10:00-10:30
Masahiko Kondow received the B.E and M.E degrees in electrical engineering, from Osaka University in 1984 and 1986, respectively. Since 1986, he had been with Central Research Laboratory, Hitachi, Ltd. He received the Ph.D. degree in electrical engineering from Osaka University in 1991. In 1998, he was with University of California, San Diego, as a visiting scholar. Since 2005, he has been with Osaka University as a professor in Graduate School of Engineering.
By the analogy of Inter-chips optical interconnections, the target density for Intra-chip optical interconnections is estimated to be 10 Pbps/cm2. This value may not be possible by Si-photonics anymore, because its target density is 10 Tbps/cm2. The authors have proposed a solution by using 2 dimensional photonic crystal (PC). The laser-cavity is a circular defect (CirD) in the PC lattice. Only a whispering galley mode (WGM) with 9 wavelengths can stably exist there. The light in the cavity is outputted through the line-defect waveguide which is optically coupled with the cavity. The lasing wavelength in each cavity can be varied by changing the radius of CirD cavity. When cavities with different lasing wavelengths are placed near an output waveguide, the wavelength division multiplexing (WDM) transmission system can be realized without a conventional optical multiplexer. Each laser can operate at a speed of 50 Gbps due to small cavity volume. Therefore, the WDM transmission system with 20 channels results in transmission capacity of 1 Tbps. Since footprint of the proposed light source is 100 μm square, the density of 10 Pbps/cm2 can be realized.
Nanyang Technological University, Singapore
Time : 10:40-11:10
Ze Xiang Shen is a Professor in the School of Physical and Mathematical Sciences at Nanyang Technological University (NTU); Co-director at the Centre for Disruptive Photonics Technologies. His main research areas include graphene, 2D materials and perovskites. He also works on graphene based composites for energy harvesting (Li Ion batteries and supercapacitors) and nano electronics. He has won the NTU Nanyang Award for Research and Innovation and Gold Medal for Research Excellence by Institute of Physics Singapore. He authored over 500 peer reviewed journal papers, six book chapters, edited five books and over 300 conference papers.
It is well established that the optical and electronic structures of two dimensional transition metal dichalcogenide (2D TMD) materials and perovskites often show very strong layer-dependent properties. It is less well-known that the properties can also be tuned by stacking order, which allows us to build electro and optical devices with the same material and the same thickness. Detailed understanding of the inter-layer interaction will help greatly in tailoring the properties of 2D TMD materials for applications, e.g. in p-n junction, transistors, solar cells and LEDs. Raman/photoluminescence (PL) spectroscopy and imaging have been extensively used in the study of nano-materials and nano-devices. They provide critical information for the characterization of the materials such as electronic structure, optical property, phonon structure, defects, doping and stacking sequence. In this presentation, we use Raman and PL techniques and electric measurements, as well as simulation to study 2- and 3-layer 2D TMD samples. The Raman and PL spectra also show clear correlation with layer-thickness and stacking sequence. Electrical experiments and ab initio calculations reveal that difference in the electronic structures mainly arises from competition between spin-orbit coupling and interlayer coupling in different structural configurations. 2D material homo-junctions using 2H and 3R stacking show clear p-n junction behavior which opens up unique potential applications for nano-electronics and solar cells.
Meijo University, Japan
Keynote: Single-walled carbon nanotube synthesis by alcohol catalytic chemical vapour deposition in high vacuum using platinum-group metal catalysts
Time : 11:40-12:10
Takahiro Maruyama is a Professor in the Department of Applied Chemistry at Meijo University, Nagoya, Japan. He has completed his Graduation in Factory of Science at Kyoto University; PhD at Kyoto University and; Postdoctoral studies at University of Tsukuba and Ritsumeikan University. He is the Director of Nanomaterials Research Center at Meijo University. He has published more than 100 papers in peer-reviewed international journals and has been serving as an Editorial Board Member of GCET.
For the realization of application of single-walled carbon nanotubes (SWCNTs) to electronics devices, control of chirality and reduction of growth temperature have been significant issues. At present, 3d transition metals, such as Fe, Co and Ni, are widely used as catalysts for SWCNT growth in chemical vapour deposition (CVD). However, due to Ostwald ripening, these catalysts are apt to aggregate at the growth temperature, resulting in enlargement of both diameter and chirality distribution of SWCNTs. We performed SWCNT growth by a gas source-type alcohol catalytic CVD system using platinum-group metal catalysts (Ru, Rh, Pd and Pt). By optimizing the ethanol gas supply using a CVD system in a high vacuum, SWCNTs were grown from these metals between 400 and 700ºC. In particular, SWCNTs were grown from Rh catalysts even below 300ºC. Irrespective of catalyst metals, the diameter and chirality distribution of grown SWCNTs became narrower, as the growth temperature decreased. The diameters of most SWCNTs grown from Pt catalysts were below 1 nm, having a narrow chirality distribution. We demonstrated that the platinum-group metal catalysts are effective for both low temperature growth and narrow chirality distribution. Based on the SWCNT diameter and catalyst particle size, we discuss the growth mechanism of SWCNTs from the platinum-group metal catalysts.