Day 1 :
Dalian University of Technology, China
Time : 9:30-10:15
Masaru Matsuo has completed his PhD at Kyoto University in Japan and he was a professor of Nara Women’s University. After his retirement, he became a full time professor of Dalian University of Technology in China. Since September 1st 2014, he is a visiting professor of Dalian University of Technology. He has published more than 200 papers in refereed journal articles. He is IUPAC fellow and “Certificate of Membership Award of ACS (July 2015~ July 2018). He received “Award of Society of Fiber Science and Technology of Japan on May 1990, “Paul Flory Polymer Research Prize” on April 2010 and “Certificate of friendship Award of Liaoning Province in China” on September 2011.
Superparamagnetism particles have been applied to magnetic fluids, microwave absorption materials, drug delivery systems and pigments. The high magnetization under external applied magnetic field could be obtained by using Zn-doped Fe3O4 nanoparticles. By the replacement of Fe3+ ions by Zn2+ ions in A-site of Fe3O4 crystal unit with inverse-spinel ferrite, the super-exchange interaction between spins of Fe3+ existing in A-site and B-site becomes weakened, while the double-exchange interaction between Fe3+ and Fe2+ in B-site remains. This indicates that the magnetization increases with Zn doping. Different from the general concept, however, the highest magnitude was x = 0.2, when Zn-doped Fe3O4 is represented as ZnxFe3-xO4 (0x1). To investigate such contradiction, the crystallinity and crystal size of Fe3O4 by the doping were evaluated using X-ray and dielectric measurements. The crystallinity and crystal size decreased with increasing x up to 0.4 but they increased beyond 0.5 inversely. This indicated that Fe3O4 crystal can not accept further doping by Zn2+ to maintain ZnxFe3-xO4 crystal. This is due to the fact that Zn doping resulted in the damage of the Fe3O4 crystal, since the atomic size (74 pm) of Zn2+ is bigger than that of Fe3+ (64 pm). As for Mg doping represented as MgxFe3-xO4, Fe3O4 crystal accepted Mg2+ up to x = 1 because of similar size of Mg2+ (65 pm). In this case, Fe3+ ion in A-site becomes zero and crystal structure of Fe3O4 crystal was collapsed. The crystallinity and crystal size were sensitive to their dielectric properties. The complex impedance for Mg0.6Fe2.4O4 and MgFe2O4 with no crystal domain can be represented by Kramers-Kronig relation which has been utilized for amorphous materials, while that for Fe3O4 and Zn0.2Fe2.8O4 can be represented by the equivalent circuit model with three units relating to suppressed circle by Cole-Cole plots. The three units correspond to particle (grain) resistance, grain boundary resistance and interface resistance between electrode and grains indicating the existence of crystal particles. The dielectric behaviors of superparamagnetism particles were in good agreement with X-ray diffraction profiles. The DC component of conductivity was highest for Zn0.2Fe2.8O4 with the highest magnetization.
Yeungnam University, South Korea
Time : 10:15-11:00
Jae-Jin Shim received his BS degree from Seoul National University in 1980, MS degree from KAIST in 1982, PhD degree from the University of Texas at Austin in 1990. He has been a professor in Yeungnam University since 1994 and served as School Chairman and Vice-Dean of Engineering. He served as the President of the Korean Society of Clean Technology and Vice President of the Korean Society of Engineering Education. He is the Directors of the Institute of Clean Technology and the Clean Energy Priority Research Center. He has published more than 150 papers in reputed journals and served as the Chief Editor of “Clean Technology”. His current research interests are synthesis and applications of graphene (or carbon nanotube)-based nanomaterials for supercapacitors, catalysts, and sensors; syntheses of polymers and organic materials using supercritical fluids and ionic liquids; living polymerization in supercritical fluids and ionic liquids; and clean technology.
Electrical double layer capacitors (EDLC) such as activated carbon have high power densities but do not have high energy densities, which hurdles the use of supercapacitors in many commercial sectors. To overcome this problem, many researchers have been working to improve the energy density of supercapacitors. Metal oxides or sulfides have been employed to exploit their pseudocapacitive natures in energy storage (supercapacitor) and photocatalyst applications. They have shown good electrochemical performances, but have not been satisfactory. Various materials such as graphene and carbon nanotubes have studied to enhance the electrochemical properties owing to their large surface area and high electrical conductivity. Synergistic effects of excellent conductivities of graphene and high electrical properties of metal oxides or polymers have improved the overall electrochemical performances tremendously.
In this study, graphene, graphene oxide, and reduced graphene oxide have been tested for improving performances as supercapacitors and photocatalysts. Other methods have also been used such as doping of graphene with nitrogen or sulfur, using metal sulfides instead of metal oxides, and using highly porous materials as substrates. In the synthesis of these materials, a cleaner technology has been employed.
Institute of Materials Science of Mulhouse, France
Time : 11:15-12:00
Lavinia BALAN obtained the PhD degree from the University Henry Poincaré in Nancy, France, in 2005. Her PhD was devoted to the elaboration of an original material for the anode of Li-ion batteries. After a post doctorate in Orleans and then in Mulhouse, she joined the Department of Photochemistry (DPG) of Mulhouse in 2006 as a CNRS Senior Researcher. She opened a new field of research in this laboratory, viz. the photoassisted synthesis of metal nanoparticles and metal-polymer nanocomposite materials. Since December 2009, L. Balan joined the Institute of Materials Science of Mulhouse (IS2M) CNRS-UMR 7361. She has published more than 100 papers, 4 book chapters and held 5 EU patents. Her lines of research are concerned with (photo)chemical synthesis of metal/polymer nanocomposites and design, customization and characterization of metal nanoparticles and nanocrystals (quantum dots) suited for advanced applications in the fields of optic, photonics, plasmonics, information storage, imaging or biology. Dr. L. Balan has been serving as an editorial board member for few scientific journals.
The size dependent properties of noble metal nanoparticles (MNPs) have created a great promise for their use in a variety of optical, electronic and biomedical applications. Nowadays, a great diversity of techniques and methods were developed for their synthesis: chemical, thermal, photochemical or biological. Among them, photochemical approach has proven an excellent tool to synthesis nanoparticles and also nanocomposites materials as well in the investigation of the mechanistic aspects of their formation. In particular, present the advantages of a “green” and “highly flexible” character and a strong control in both spatial and temporal directions. In this context, firstly, we will use the photochemistry to generate MNPs through photo reduction of a metal precursor using free radicals generated from photosensitizers in an aqueous solution or directly generated onto a glass surfaces in order to produce plasmonic surfaces. Thus efficient nanoparticles synthesis and their morphological control require a careful selection of experimental conditions such as photonic and chemical parameters. Moreover, the photochemical tool was used not only to the nanoparticles synthesis but also to obtain advance nanomaterials as nanocomposites metal/polymer. The hybrid nanocomposites have been obtained by combing the in situ photoreduction of MNPs with the acrylates monomers photopolymerisation. Specific interactions between the macromolecular network and the nascent particles was funded to play an important role insofar as they control the access of metal atoms to the different crystalline planes of the growing nanoparticles, which is necessary to obtain anisotropic objects. The assembling process of MNPs in the polymer matrix was the next step of our work. Controlling both the synthesis and multi-scale organization (nano, micro and macro) of such cross-linked organic-inorganic nanomaterial opens promising prospects in the field of advanced materials.
Wuhan Universities, China
Keynote: Applications of four-dimensional electron microscopy in studies of dynamics and structures of nanomaterials
Time : 12:00-12:45
Jau Tang is a distinguished professor in the Institute of Technological Sciences at Wuhan University in China. His research areas include nanoscience, 4D electron microscopy, ultrafast phenomena, single-molecule spectroscopy, phase transitions, plasma hydrodynamics, optoelectronics, synthetic diamond growth, photochemistry and electron transfer reactions. He received his PH.D. degree from UC Berkeley (1981), and has worked at Argonne National Lab, Bell Labs, Caltech prior to Wuhan University.
By combining high spatial and temporal resolution of 4D electron microscopy we have demonstrated its some applications in nanoscience and nanotechnology. We are able to investigate ultrafast dynamics and atomic scale spatial resolution of nanomaterials which might help soling important issues in energy, environment and health related issues in modern society. In our 2015 Science paper we have used USEM (ultrafast scanning fast electron microscopy) ultrafast dynamics of photo-induced electrons and holes induced by fs laser in p-n semiconductor junctions. We have observed ballistic dynamics and gating mechanism of the depletion zone for the hot charged carriers at short times, rather than the more familiar carrier diffusion. Moreover, we have also observed THz plasma waves at high laser fluence due to Coulomb forces among carriers. In our another Science paper in 2017 and a paper in Science Advances we have studied photo-induced rotational and translational motion of single gold nanoparticles Using UTEM (ultrafast transmission electron microscopy) we observed ballistic motion with friction, yet at longer time scales abnormal diffusion with extremely fast diffusion was observed. We have identified steam nanobubbles generated on the laser-heated gold nanoparticles are the driving force for such fast dynamics. We have also investigated the processes of nucleation from the liquid phase to final crystallization of TiO2 nanoparticles to elucidate the mechanism. Eutectic reactions of alloys from GaAs nanowires encapped by a gold tip were also studied to improve understanding of the lase heating and heat transfer processes during superstructure formation of the alloy. In another work of USEM of graphene monolayer, we have observed dynamic spatial and temporal distributions of charged carrier, exhibiting a crater-shaped charge density map at high fluence and yet a Gaussian distribution at low fluence. We have attributed these phenomena to Auger-assisted charge recombination processes.
- Advance Nanomaterials and Nanoparticles | Materials science and Nanotechnology | Nanotechnology in Energy and Environment | Molecular Nanotechnology | Nanodevices and Nanosensors | Nano Electronics and Microsystems | Nano Physics
Location: Osaka, Japan
Prof. Masaru Matsuo
Dalian University of Technology, China
Institute of Materials Science of Mulhouse-CNRS, France
Dr. Hao Yu is associate professor at Xi’an Jiaotong-Liverpool University. He received the PhD degree in Condensed Matter Physics from Nanjing University in 2007. He worked for Suzhou Institute of Nano-tech and Nano-bionics of Chinese Academy of Sciences, from 2007 to 2009. He joined Xi’an Jiaotong-Liverpool University in Feb. 2010. His research interests include spintronics and complex network.
The dynamic magnetization of nanomagnets is significant to spintronic devices in terms of high speed and high density storage technology or logic applications. The dynamics of the macrospin model of a single-domain nanomagnet is investigated in both analytical and numerical methods based on the Landau-Lifshitz-Gilbert equation which is a nonlinear differential equation describing the evolution of magnetization vector. The dynamic hysteresis, namely the magnetic switching under high frequency magnetic field with/without spin transfer torque is analyzed in terms of the evolution of the geometry of loop. The shape of static hysteresis loop is determined by the parameter of damping, meanwhile the shape evolution of dynamic hysteresis loop is dependent on the magnitude of field and frequency. Frequency-dependent response with resonant peak has been found in the dispersion curve. The phase diagram is obtained to be able to have a clear picture of the dynamic magnetization of nanomagnets driven by periodic field or current.
University of Western Ontario, Canada
Time : 14:15-14:45
Jin Zhang is a tenured Associate Professor with the Department of Chemical and Biochemical Engineering in the University of Western Ontario (Western), Canada. Her research activities are related to the development of new biocompatible nanocomposites with enhanced chemical and physical properties. Dr. Zhang has published over 66 peer-reviewed papers, including Biosensor & Bioelectronics (impact factor, IF: 7.2), J. Eur. Cells & Mater. (IF 5.98), J. of Nanobiotechnology (IF 4.85), J. Chem. Mater. B (IF 4.7), etc. Her group has given over 90 presentations at national and international conferences; she has 3 issued patents, and one patent application. Dr. Zhang has gained many awards, including Early Research Award of Ontario, the Grand Challenges Canada-Canadian Rising Stars in Global Health, Outstanding Mid-Career Achievements in Nanoscience and Nanotechnology in Ontario, etc.
Carbon-based nanomaterials including graphene, graphene oxide, and carbon quantum dots have shown special luminescence properties. This paper focuses on building an aptamer sensor by using carbon quantum dots (C-dots) and graphene oxide nanosheet. C-dots were synthesized by microwave-assisted process. The average particle size of C-dots is estimated at 23±5 nm. The fluorescence emission of C-dots shifts from 450 to 600 nm when excitation increases from 350-450nm. The target-DNA is conjugated onto C-dots by different strategies. Meanwhile, the capture-DNA is modified on the surface of graphene oxide. The target-DNA conjugated with Carbon Dots can be hybridized with the capture-DNA conjugated with graphene oxide by hydrogen bonds between adenine and thymine, which can cause the fluorescence quench of C-dots. The fluorescence intensity of C-dots modified with target-DNA as a function of the concentration of capture-DNA modified graphene oxide nanosheet is investigated. The results indicate that the this solution-based sensor can quickly measure the target-DNA in the range of 1µg/mL to 100 µg/mL.
Center for Materials Nanoarchitectonics, NIMS, Japan
Time : 14:45-15:15
Jonathan P. Hill is Chief Scientist at the Supermolecules Group, National Institute for Materials Science, Japan. His main research interests are the synthesis and assembly of organic molecular and nanostructures for potential applications in molecular electronics, sensing and related fields. He is coauthor of more than 350 published papers and 20 patents on these subjects. He is also author of more than 300 invited and contributed presentations at international conferences and university seminars.
Supramolecular arrangement of porphyrins and other molecules has great potential in the fields of molecular information storage and sensing due to their ease of deposition and good chemical and thermal stabilities. In particular, porphyrins of relatively large molecular weights can be applied in thermal deposition while tetrapyrrole molecules have had an extensive synthetic chemistry developed, which enables synthesis of complex derivatives. In this work, we present complementary examples of porphyrin nanoarchitectonics. Starting from simple symmetrical phenol derivatives, we describe the effects of steric hindrance about the respective hydroxyl groups and also the effects of conformational variation on the self-assembly structures. We also investigated fabrication of binary molecular monolayers using two different porphyrin molecules tetrakis(3,5-di-t-butyl-4-hydroxyphenyl) porphyrin and tetrakis(4-pyridyl) porphyrin by deposition in ultrahigh vacuum. This leads to two unusual heteromolecular monolayer structures were observed with one exhibiting good separation of molecules within the monolayer. Meanwhile, a synthetic nanoarchitectonic approach was used to prepare self-assembled molecular nanowires at a mica substrate. The nanowires could be observed growing using atomic force microscopy (AFM) and the network structures of the nanowires can be influenced by manipulation using the AFM probe tip. Formation of molecular monolayers with chromophores positioned remote from the substrate surface will also be discussed. Additionally, the synthesis and self-assembly at surfaces of novel heteroacenes will be described and the potential importance of these materials in several applications will be discussed.
Seoul National University, South Korea
Time : 15:15-15:45
Prof. Seung Hwan Ko is a professor in Applied Nano & Thermal Science Lab, Mechanical Engineering dept., Seoul National University, Korea. Before joining Seoul National University, he was a faculty at graduate school of EEWS (Energy, Environment, Water and Sustainability), KI nano century, and Department of Mechanical Engineering at KAIST (Korea Advanced Institute of Science and Technology), Korea. He received his Ph.D. degree in mechanical engineering from UC Berkeley in 2006. He worked as a researcher at Lawrence Berkeley National Lab until 2009. His research interest is laser assisted nano/micro fabrication process development, laser-nanomaterial interaction, low temperature process development for flexible, stretchable and wearable electronics, and crack assisted nanomanufacturing.
It is well expected that the future electronics will be in the form of “wearable electronics”. Google’s Smart Glass and Apple’s iWatch are the first generations of wearable electronics. However, they are still mainly composed of rigid electronics even though human body is soft and elastic. To realize more meaningful and practical wearable electronics, electronic components should be stretchable or at least flexible. We developed various hierarchical multiscale hybrid nanocomposite for highly stretchable, highly flexible or highly transparent conductors ultimately applied for wearable electronics applications. The hybrid nanocomposite combine the enhanced mechanical compliance, electrical conductivity and optical transparency of small CNTs (d~1.2 nm) and the enhanced electrical conductivity of relatively bigger AgNW (d~150 nm) backbone to provide efficient multiscale electron transport path with AgNW current backbone collector and local CNT percolation network. Additionally, this approach combine “materials that stretch” and “structure that stretch” strategies to demonstrate highly stretchable conductor.
As a feasibility test of our hierarchical multiscale hybrid nanocomposite stretchable and transparent conductor research, we demonstrated a highly stretchable LED circuit and a touch panel. This is just a very tiny fraction of application area of our works. We expect our approach can be applied to huge range of wearable electronics elements such as high performance displays, solar cells, sensors, touch screens in flexible and stretchable forms and ultimately to all future electronics. Therefore, this research results have a great ripple effect on various future electronics development and will be sustainably studied. Considering the huge impact, originality and advantages of our research results, this paper will provide basic research results and becomes a classical reference for future wearable electronics field.
University of Bordeaux, France
Time : 16:00-16:30
Dr Angéline Poulon is an associate professor at the University of Bordeaux and ICMCB. She has a long experience in the correlation between process parameters, microstructure and properties of structural and functional materials. Her current interests range from the search for innovative multifunctional coatings to the development of green processes to elaborate intermetallic compounds, for applications in energy, aerospace and aeronautical industries. She is a specialist in fine characterization with an extended recognized experience in electronic microscopy and physico-chemical techniques. She has co-authored 31 peer-reviewed articles, 37 oral presentations, 12 invited conferences and 4 patents.
Thermoelectric (TE) materials have received a lot of interest for decades for power generation applications in waste heat recovery or energy harvesting by conversion of waste thermal energy into useful electricity. The performance of TE devices depends on the dimensionless figure of merit ZT = (α²σ/κ)T, where α is the Seebeck coefficient, σ and κ the electrical and thermal conductivities, respectively, and T is the absolute temperature. Many TE materials have been developed such as Bi2Te3, PbTe, Mg2Si, Zn4Sb3, filled skutterudites and SiGe. Among them, skutterudite compounds MX3 (M = Co, Rh or Ir; X = P, As or Sb) crystalized in the bcc structure Im3 are promising TE materials. The binary skutterudite CoSb3 exhibits a large Seebeck coefficient and a high electrical conductivity. However, its high thermal conductivity makes it difficult to be an efficient TE material. Nanostructuration is an effective approach to lower thermal conductivity. While physical methods allow high purity microparticles synthesis, solution routes are the most effective methods to produce CoSb3 nanoparticles with a few nanometer size and have advantages of low cost, low processing temperature (< 300°C) and high reproducibility, allowing possible large-scale production, even if they suffer from long reaction time, multiple reaction steps and impurity presence. Supercritical fluid routes have emerged from the two last decades as novel efficient approaches to synthetize metal nanoparticles with the control of their physicochemical properties as size, morphology, crystallographic structure and composition. We report the first fast and continuous supercritical fluids synthesis of cobalt antimony intermetallic nanoparticles (4-5 nm) with a high reliability.
Akita Ind. Tech. Cent., Japan
Title: Magneto-plasmonics on perpendicular magnetic nanostructures consisting of CoPt nano-layer and noble-metal nanoparticles
Time : 16:30-17:00
Haruki Yamane received the B.S. degree in Physics from Ehime University in 1987, and his Ph.D. in School of Engineering from the University of Tokyo in 1996. From 1989 to 1999 he was with Oki Electric Industry Co., Ltd., and in 1999 he joined Akita Industrial Technology Center. His research interests include magnetic properties of nanostructures and photonic devices using magneto-optical activities. Nano-photonics on magnetic nanostructured materials has recently become an active area of research. He is a member of the Japan Society of Applied Physics, the Magnetic Society of Japan, and the Japan Institute of Metals and Materials. Currently he is working as a Research Officer at Akita Industrial Technology Center, Japan.
The interaction between magneto-optical (MO) activities and plasmons has been intensively investigated from fundamental and applied viewpoints. Improvement of the MO effect is desirable in practical applications such as information storage systems, telecommunications, and chemical and biological sensors. In this presentation, the MO properties of perpendicular magnetic nanostructures consisting of a hexagonal close-packed Co80Pt20 nano-layer and noble-metal (Ag or Au) nanoparticles were investigated under polar Kerr measurement conditions. The samples exhibited an unusual MO hysteresis loop in which the Kerr rotation angle increased at a low magnetic field; this effect was observed at a different wavelength region for the CoPt–Ag and CoPt–Au samples. The nanostructures consisted of two magnetic regions of CoPt layers formed on the nanoparticles and on the underlayer. The increase in the Kerr angle was induced by the antiparallel magnetic alignment of these CoPt layers. The opposite MO polarity on the CoPt nanostructures was suggested also in a micro-MO observation using scanning near-field polarized optical microscopy. The Ag and Au nanoparticles induced the MO phase reversal at a different wavelength region for each plasmon excitation. The MO behaviors on the CoPt nanostructure are attributed to the influence of localized surface plasmons excited on the noble-metal nanoparticles. The magneto-plasmonic activities on the nanostructures were also changed by the underlayer material and the external environmental conditions. We have demonstrated the magneto-plasmon sensor consisting of the CoPt−Ag by detecting the change in external environment (optical index), and a new detection parameter using MO activities has been proposed. The perpendicular magnetic nanostructures are expected to provide a new type of probe for chemical and biological sensing applications.
Ulsan National Institute of Science and Technology , South Korea
Time : 17:00-17:30
Hyunhyub Ko is currently an Associate Professor in Energy and Chemical Engineering at Ulsan National Institute of Science and Technology. He has received his PhD in Materials Science and Engineering from Georgia Institute of Technology in 2008, MS in Materials Science and Engineering from Iowa State University in 2004, MS in Chemical Engineering from Yonsei University in 2001 and BS in Chemical Engineering from Chung-Ang University in 1999. From 2008 to 2010, he worked at University of California, Berkeley as a Postdoctoral Fellow in the Department of Electrical Engineering and Computer Sciences. His research interests are in the area of functional nano-materials for flexible electronics, sensors and energy devices.
Flexible physical sensors with high sensitivities have gained great attentions in the fields of wearable devices, robotic skins and biomedical diagnostics. In human fingertip skins, fingerprint patterns and interlocked epidermal-dermal micro-ridges have critical roles in amplifying and transferring tactile signals to various mechanoreceptors, enabling spatio-temporal perception of various static and dynamic tactile signals. Here, mimicking the structures and functions of fingertip skin, we introduce highly-sensitive, multifunctional and stretchable electronic skins. Inspired by the interlocked microstructures found in epidermal-dermal ridges in human skin, piezoresistive interlocked micro-domes are employed for the demonstration of stress-direction-sensitive, stretchable electronic skins. We show that interlocked micro-dome arrays possess highly direction-sensitive detection capability of various mechanical stimuli including normal, shear, stretching, bending and twisting forces. We also demonstrate that ferroelectric skins with fingerprint-like patterns and interlocked microstructures can detect and discriminate multiple spatio-temporal tactile stimuli including static and dynamic pressure, vibration and temperature with high sensitivities. For applications, we demonstrate that stretchable electronic skins attached on the human skin can be used as wearable healthcare monitoring devices, which are able to distinguish various mechanical stimuli applied in different directions, selectively monitor different intensities and directions of air flows and vibrations, and sensitively monitor human breathing flows and voice vibrations. In addition, dynamic touch sensing ability is employed for the precise detection of acoustic sounds, and discrimination of various surface textures. Finally, for multifunctional wearable and skin-attachable devices, we show smart adhesive pads with temperature-responsive adhesion properties and force-dependent color changing touch screens based on mechanochromic surface coatings.