18^th International Conference and Exhibition on Materials Science and Engineering May 28-30, 2018 Osaka, Japan

Cheng-Chun Chou graduated from the department of Chemical and Materials Engineering National Kaohsiung University in 2016. Now I am a graduate student in Department of Chemical and Materials Engineering, National University of Kaohsiung, Taiwan. My research focuses on quantum dots and polymer composites which would use in wide range of applicability. Corresponding author Chien-Hsin Yang took his BS degree from the department of chemical engineering, National Taiwan University of Technology and Science, 1985, gained his MS degree from the department of chemical engineering, National Cheng-Kung University,1987. Then, Yang has taken his PhD degree from National Cheng-Kung University in 1994, and worked as a Professor in the Department of Chemical and Materials Engineering, National University of Kaohsiung since 2007. Professor Yang’s research intersting included conducting polymers, polymer electrolytes, organic/inorganic nano-material hybrids in the application of optoelectronic devices, For example: solar cell, PLED, electrochromic devices, and QD LED, etc.

The core-shell quantum dots CdSe/ZnS prepared by one-step synthesis method are evenly dispersed in the polymer. Adding the quantum dots into the polymer with solvent dilution is a common process, which makes the quantum dots well-disperse in polymer and coats on the substrate surface with removal of solvent by heating to obtain the resulting luminescent film. This process usually takes a long time. In our research, an alternative process of photopolymerization was employed to quickly obtain a smooth light-emitting film. This resultant light-emitting film can be used in Q-LED mixed-light-emitting component. Through adjusting the ratio of red and green quantum dots in UV-curing polymer film, a white light would be emitted using the exciting of blue-light LED on the UV-curing polymer film. This technology can be utilized to the display industry.

Jhen-Wei Wu graduated from the undergraduate of National United University in 2016 and majored in Materials Science and Engineering. Currently, I am a graduate student in the Department of Chemical and Materials Engineering, National University of Kaohsiung, Taiwan. My research intersting focuses mainly on anti-corrosion properties of organic film on steel substrates. Corresponding author Chien-Hsin Yang took his BS degree from the department of chemical engineering, National Taiwan University of Technology and Science, 1985, gained his MS degree from the department of chemical engineering, National Cheng-Kung University,1987. Then, Yang has taken his PhD degree from National Cheng-Kung University in 1994, and worked as a Professor in the Department of Chemical and Materials Engineering, National University of Kaohsiung since 2007. Professor Yang’s research intersting included conducting polymers, polymer electrolytes, organic/inorganic nano-material hybrids in the application of optoelectronic devices, For example: solar cell, PLED, electrochromic devices, and QD LED, etc.

There are hydroxyl groups on the surface of titanium dioxide, which can bond with the silyl groups on N-[3-(Trimethoxysilyl)propyl]aniline (TMSPA) to modify the surface of titanium dioxide. In this work, TiO2-TMSPA compounds were deposited on mild steel substrate by spray method. Anti-corrosion was evaluated by using electrochemical impedance spectroscopy (EIS) and linear polarization, respectively. The experimental results show that the low-carbon steel TiO2-TMSPA film has a corrosion resistance in 1M hydrochloric acid, 0.5M sulfuric acid and 1M sodium chloride solution respectively.

Shiow-Kang Yen has completed his PhD at the age of 33 years from c. He was the director of Department of Materials Science and Engineering National Chung Hsing University (1997~1999). He was awarded the outstanding researcher in National Chung Hsing University (2004). He has published more than 68 papers in reputed journals.

Direct methanol fuel cells (DMFCs) are widely used in small-scale portable applications, and Pt is the superior and major catalyst in them, due to its excellent catalytic activity and chemical stability. However, Pt catalysts have two major problems should be overcome in DMFCs. One is that CO poisoning effects on the Pt catalysts should be deleted, and the other is that the amount of Pt should be cut for reducing the cost of devices. Although some Pt/transition metal (TM) phosphate catalysts have proved themselves as bifunctional ones, their poor electronic conductivities have resulted in the poor performances in membrane electrode assembly (MEA) tests for DMFCs. In order to enhance their conductivities, the precipitations of Fe, Cu and Sn phosphate (FeP, CuP and SnP), were directly on the surface modified carbon black (CB) to form FeP-CB, CuP-CB and SnP-CB supports, respectively. Then, nano-sized Pt was reduced on ℃them to form Pt/FeP-CB, Pt/CuP-CB and Pt/SnP-CB catalysts and finally annealed at 100 for 3 hours. The features of these catalysts were characterized by the electric resistance measurement, X-ray diffraction, field emission scanning electron microscopy, field emission transmission electron microscopy – live fast Fourier transform, X-ray photoelectron spectroscopy, inductively coupled plasma-mass spectrometry, Fourier transform infrared spectroscopy and cyclic voltammetry . Their electric resistances are reduced to 119, 79 and 85 Ω, resulting in the mass activities enhanced to 132, 328 and 294 (A/gPt), and the on-set potentials lower shifted to 0.250, 0.256 and 0.200 V (vs. Ag/AgCl), in the methanol oxidation reaction (MOR) for Pt/FeP-CB, Pt/CuP-CB and Pt/SnP-CB catalysts, respectively, all revealing no CO poison effects. In MEA tests for DMFCs, they also exhibit the maximum power densities of 27.5, 10.2 and 6.4 mWcm-2mgPt-1and the open circuit voltages (OCV) of 0.480, 0.408 and 0.468 V, much better than the commercial Pt/C. Obviously, the Pt/TM phosphate-CB catalysts have revealed the improved performance due to their well-dispersed catalysts with enhanced conductivity and detoxifying function. However, their onset potentials should be further lowered to perform the comparable OCV to the PtRu/C catalyst.

Chun-Huei Tsau graduated from Department of Materials Science and Engineering, National Tsing Hua University, Hsinchu, Taiwan. Now, he is a professor of Institute of Nanomaterials, Chinese Culture University, Taipei, Taiwan. His research recently focuses on the development of corrosion resistant high-entropy alloys.

This equimolar FeCoNiMo alloy was designed from the high-entropy alloy concept. The granular FCC-structured FeCoNi alloy had a good corrosion resistance in acidic solutions, but its soft manner limited its applications. Therefore, this study added molydbenum into FeCoNi alloy to improve its hardness. This study investigated the microstructures and hardness of FeCoNiMo alloy, the polarization behaviors of FeCoNiMo alloy in 1M deareated hydrochloric acid and 1M sodium chloride solutions were also tested. Results indicated that the FeCoNiMo alloy had a dendritic microstructure, also had higher hardness than that of FeCoNi alloy. Therefore, addition of molydbenum not only changed the microstructure of granular FCC-structured FeCoNi alloy, but also enhanced the hardness of the alloy. Additionally, the polarization curves of FeCoNiMo alloy indicated that corrosion resistance of this alloy in these two solutions was better than that of commercial 304 stainless steel. This was contributed by the molydbenum, because molydbenum could improve the localized corrosion resistance. Also, addition of molydbenum changed the pitting morphology from a deep type to a shallow one. All of these indicated that the FeCoNiMo alloy had a good commercial application potential, especial in the solutions with chlorine ions.

Szu-ChenWu received the B.S. in chemical engineering and the M.S. degree in Department of Chemical and Materials Engineering, Chung Cheng Institute of Technology, Nation Defense University, in 2011 and 2014, respectively. He is currently a doctoral student and joined functional photoelectric and nano-biomaterials research lab at NCTU. His current research interest is microwave absorption material.

In this study, we have designed order stacking and nano-porous structure by direct growing metal–organic framework (MOF) on the surface of layered double hydroxide (LDH) via through seed-mediated growth method. The phase and morphology of LDH@ZIF-67 samples were examined with X-ray powder diffraction (XRD) and field emission scanning electron microscope (FE-SEM), respectively. The FE-SEM images of LDH@ZIF-67 showed as-synthesized morphology, which found the amount of ZIF-67 increasing with molar ratios of Co. XRD pattern found that the plane of LDH (003) at 2 = 10.5 is matched with the plane of ZIF-67 (002) at 2 = 10.4 in LDH@ZIF-67. X-ray photoelectron spectroscopy (XPS) and fourier-transform infrared (FTIR) spectroscopy of LDH@ZIF-67 signals are show Co-N bonding signals on 406.6 eV and 423 cm−1, respectively. It found that the magnetization 10.3 to 40.3 emu g-1, which attributed to the increased Co ratio. Therefore, the formation mechanism of LDH@ZIF-67 is probably involved partial dissolution/coordinative interaction of LDH with ZIF-67 in a solution of 2-methylimidazole. For microwave absorption measurement, the as-prepared LDH@ZIF-67 hybrids were mixed with epoxy and then molded into test samples containing 50 wt% of LDH@ZIF-67 hybrids. The maximum reflection loss of 16.3 dB at a thickness of 2.5 mm. The LDH@ZIF-67 composite with magnetic capacity exhibited well absorption due to increased permeability, which is attributed to ZIF-67, produce higher characteristic of magnetization in LDH@ZIF-67 and the nano-porous structure of ZIF-67. Such excellent electromagnetic wave absorption properties are ascribed to the synergetic effects between the highly porous structure and multiple components, which significantly improved impedance matching.

Dodam Kim has completed his B.S degree at the age of 26 years from Hanyang University majoring in Materials Science and Engineering. Now, he is a M.S candidate of Korea Advanced Institute of Science and Technology(KAIST). His main interest is fabrication of QD film using mesoporous template. His advisor, Duk Young Jeon, is a professor of department of Materials Science and Engineering at KAIST. He a director of Display Materials Laboratory(DML) and published over 150 papers for international journals.

Quamtum dot(QD) has received great interests as a next-generation display material because of its narrow full-width half-maximum(FWHM) related with high color purity and size-tunable emission wavelength. Generally, QD film is fabricated by spin coating method to be served as an emission layer or color filter. However, the spin coating method severly wastes the amount of coating material in the process(over 90%). Considering the cost of Cd-based QDs(30 $/mg), it is required to prevent dissipation of QDs in order for QDs to be applied to display industry with economical excellence. On the other hand, dipping method can be an alternative way to fabricate films with minimized waste of materials. Therefore, we synthesized mesoporous TiO2 template and CdZnS/ZnS QDs capped with oleic acid(OA) to chemically adsorb the QDs into the template through dipping method. To that end, it is crucial to induce chemical bond beetween QDs and TiO2 particles. It has been noted that carboxyl group(-COOH) can make a bond with defect site(Ti+) of TiO2 particle. This was possible through exchanging the ligand of QDs from OA to mercaptopropionic acid (MPA). Consequently, in addition to the suppressed loss of QDs, the amount of QDs in the fabricated film increased about twofold compared to spin-coated QD film. This was because the QDs were successfully adsorbed in the pores of mesoporous TiO2 template. Owing to the increased amount of QDs in the template, the photoluminescence(PL) intensity of synthesized film increased by 17.2 times compared to bare QD film.

Wonseok Choi has completed his M.S degree at the age of 27 years from Korea University. Now aday, He is under the doctoral course from Korea advanced institude science and technology(KAIST). He focus on display materials such as quatum dot and nano rod research.

Quantum dot(QD) is known as promising luminescent material due to properties, which are high photoluminescence quantum yeild(PLQY) and color tunablity. Specially, Utilization of flexible device is considered because of small size. QDs are required to make a film for applying light emitting device and color filter. When distance between QDs is close as in QD film, PLQY is dramatically decrease by forster energy transfer. It is serious problem in QD film. To solve this problem, We had demonstrated attached QD in the mesoporous TiO2 film. The porosity of TiO2 can be controlled through the amount of organic material (ethylcellulose) in the paste. As the pores decrease, the amount of QD that can be loaded in the same volume decreases. The QD is adsorbed on the surface area of TiO2, and the TiO2 layer present between the adsorbed QDs reduces the distance between the QDs. Therefore, the porosity of the mesoporous TiO2 film affects the distance between the adsorbed QDs. In addition, since the dipping method is used in the fabrication method of the QD-TiO2 film, the use of the QD can be dramatically reduced as compared with the spin coating method which has been used so far. As a result, the QD-TiO2¬¬ film showed 4 times longer than the QD only film as the porosity increased. Due to the increase in decay time, the PL intensity increases up to 9 times.

Jinyoung Choi has completed his bachelor’s degree of material science and engineering at the age of 25 from Seoul National University. He is currently in master’s course of material science and engineering at Korea Advanced Institute of Science and Technology. His major research subjects include synthesis and property control of quantum dots and other nanoparticles.

We demonstrated synthesis method of Copper Indium Sulfide (CuInS2) with Zinc Sulfide (ZnS) shell Quantum Dots (CIS/ZnS QD) comprising fine luminescence and high potential for facile Ligand Exchange. For the utilization in Bio and Organic fields, the QDs are generally required to exhibit hydrophilic surface property and low toxicity while sustaining high luminescence and stability. Therefore the Ligand exchange process is necessary as most QDs have hydrophilic ligands upon synthesis. Here we focused on modifying synthetization method to grant the QDs with high potential for ligand exchange, with sustained luminescence compared to conventional method. This was accomplished by adopting relatively easily detachable ligand mixed with stable, luminescence enhancing ligand. The CIS/ZnS QDs synthesized by the new method possessed high ligand exchange rate upon know exchange methods yet sustaining equivalent Photoluminescence Quantum Yield (PLQY) and stability compared to QDs synthesized with single ligands. The ligand exchange was examined by conducting ligand exchange process to hydrophilic ligands for the both new and conventional QDs, and mixing the ligand exchanged QDs with TiO2 paste. The ligand exchanged samples of newly synthesized QDs showed remarkable high compatibility to the TiO2 paste compared to the conventional QDs, indicating higher ligand exchange rate. Thus the surface ligand controlling was identified as a requirement for efficient QD ligand exchange.

Yong Hyun Kim is an associate professor at Pukyong National University. He received his PhD degree from Technische Universität Dresden, Germany in 2013, under the supervision of Prof. Karl Leo in the Institut für Angewandte Photophysik (IAPP). After that he worked as a post doctoral associate at University of Minnesota, and later was promoted to Professor in 2014. His research focuses on wearable electronics, alternative transparent electrodes, and light trapping/extraction systems for organic solar cells and organic light-emitting diodes.

The development of transparent electrodes is of great importance for realizing the full advantages of organic photovoltaic cells (OPV cells) and organic light-emitting diodes (OLEDs) such as being cheap and flexible. The commonly used indium tin oxide (ITO) as a bottom electrode remarkably increases device costs due to limited indium supply and the inherent brittleness of the material which hinders the applications in flexible devices. Therefore alternative electrodes are extensively investigated to replace ITO. Among various alternative electrodes, poly(3,4-ethylenedioxythiophene):poly(styrenesurfonate) (PEDOT:PSS) is regarded as an especially promising alternative electrode due to its high conductivity and transmittance, excellent flexibility, and low-cost processing.. We have prepared highly conductive, transparent PEDOT:PSS films for use as an electrode in organic solar cells. By the addition of solvent, the conductivity of the thin-films increases, and by the additional solvent post-treatment method, the conductivity increases further attributed to the removal of PSS from the PEDOT:PSS layer. The highest conductivity of 1418 S/cm has been obtained for a single layer PEDOT:PSS film. Multi-layered PEDOT:PSS films show low sheet resistances (< 65 ohm/sq) with high transparencies (> 80 %). Based on the post-treated PEDOT:PSS electrodes, we could produce OPV cells with a comparable efficiency to that of an ITO-based cell. Furthermore, we report efficient transparent OLEDs with improved stability based on conductive, transparent PEDOT:PSS electrodes. Based on optical simulations, the device structures are carefully optimized by tuning the thickness of doped transport layers and electrodes. As a result, the performance of PEDOT:PSS-based OLEDs reaches that of ITO-based reference devices.

Professor Wha Jung Kim has worked at the department of Materials Chemistry and Engineering, Konkuk university since 1990. His research has been focused on zeolite synthesis and its application such as CO2 adsorption, heavy metal removal through ion exchange, catalytic reaction, development of electrochemical catalysts and their application to PEMFC, His expertise is especially toward the development of self-humidifying catalyst and membrane.

A hollow shell TiO2 (HTiO2) with a high surface area was synthesized via the monodispersed SiO2 nanoparticles as the template onto which Pt nanoparticles were deposited. The self-humidifying dual catalyst electrode (DCE) comprising Pt/C and Pt-HTiO2 was applied to the MEA. Pt/C acts as the catalyst for oxygen reduction reaction while Pt-HTiO2 provides the sites for the creation of water (Pt sites) and the water retention by hydrophilic hollow structured HTiO2. This unique dual catalyst electrode is expected to humidify the membrane, making the operation of the PEMFC in the absence of water (i.e. zero relative humidity). The physical properties of HTiO2 obtained under different calcination temperatures were investigated: that is, specific surface area by Brunauer-Emmet-Teller method (BET), pore size distribution by Barrett-Joyner-Halenda (BJH) method and water uptake. Contact angle was conducted to Pt-HTiO2 catalyst layer to identify the hydrophilicity of various Pt-HTiO2. In addition, several electrochemical properties were also investigated and the cell performance for the membrane electrode assembly fabricated with prepared dual catalyst electrodes were conducted and discussed.

Dr. I. López Arbeloa (Ph.D. in Chemistry) is a Chemical Physics Professor in the University of the Basque Country (UPV/EHU). Currently researches in photophysics of dyes in different nanostructured materials, being interested in photonics applications as materials for active media of dye lasers, photoactive multifunctional hybrid materials for optical antenna for photovoltaic cells, photodynamic therapy nanoparticles, etc.

The incorporation of photoactive molecules into ordered nanostructured systems is a growing field for the development of new functional materials. In particular, for optical applications in which optically very dense materials are needed, an appropriate strategy to avoid dye aggregations is dye-encapsulation into nanochanneled inorganic structures. In this work, fluorescence dyes are incorporated into a 1D-aluminophosphate by crystallization inclusion method, allowing a perfect fit between the molecular and channel dimensions. A good fitting between the pore size and molecular structure is relevant in order to avoid undesirable aggregates, to achieve a preferential orientation of the guest, and to minimize molecular motion. Thus, fluorescent capacity of the dyes can be ehanced, and anisotropic behaviour can be also envisaged. In this work, different chromophores, acridine (AC), Pyronine (PY) and LDS 722 dyes has been encapsulated into the 1Dnanochannels of MgAPO-11 aluminophosphate crystals (AEL structure). The final solid hybrid materials show interesting optical properties such as i) fluorescence colour switching depending on the direction of the polarizers upon UV light excitation, ii) white light emission materials and iii) NLO properties such as Second Harmonic generation (SHG) and 2-photon fluorescence signals under IR light excitation.