Enthusiastic discussions on solid physic and material science at SPMS2019

Science & Technology Development Journal, 23(2):490-498 Open Access Full Text Article Letter to Editor 1Faculty of Biotechnology, Chemistry and Environmental Engineering, Phenikaa University, Hanoi 10000, Vietnam 2Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi 10000, Viet Nam 3International Training Institute for Materials Science (ITIMS), Hanoi University of Science and Technology (HUST), No 1 - Dai Co Viet Str, Hanoi, Vietnam 4Institute of Low Temperature and Structure Research, Polish Academy of Sciences, Wroclaw, Poland Correspondence Van-Duong Dao, Faculty of Biotechnology, Chemistry and Environmental Engineering, Phenikaa University, Hanoi 10000, Vietnam Phenikaa Research and Technology Institute (PRATI), A&A Green Phoenix Group, 167 Hoang Ngan, Hanoi 10000, Viet Nam Email: duong.daovan@phenikaa-uni.edu.vn Enthusiastic discussions on solid physic andmaterial science at SPMS2019 Van-Duong Dao1,2,*, Nguyen Duc Chien3, Wiesław Strek4 Use your smartphone to scan this QR code and download this article ABSTRACT At 11th National Conference of Solid Physics and Material Science (SPMS2019), to which eminent scientists (5 plenary speakers and 16 invited speakers) were invited, most of the discussion focused on solid physic andmaterial science. Around 300 researchers interested in the subject attended the conference and actively participated in the discussion. There were more than 200 reports with five specialized subcommittees: (A) Physics and magnetic materials, (B) Semiconductor and dielectric physics, (C) Materials - semiconductor components - dielectric, (D) Biomedical materials - agricul- ture, energy - environment, (E) Composite materials - metals - ceramics. Besides, numerous reports submitted to the Journal of Science and Technology (Vietnam Academy of Science and Technol- ogy), full-text reports sent to the Organizing Committee, after a critical review process, had been summarized and published in the Collection of conference reports. Key words: Solid physic, Materials Science, SPMS, Energy conversion, Carbon Materials INTRODUCTION SPMS2019 co-organized by the Vietnam Physical So- ciety, the VietnamMaterials Research Society, the In- stitute of Physics, the Institute of Materials Science (VietnamAcademy of Science and Technology), Viet- namNational University (VNU), PhenikaaUniversity and Quy Nhon University was held on 2 - 4 Novem- ber, 2019 in Quy Nhon City, Binh Dinh Province. The conference has been attracted 5 pleanary speak- ers, 16 invited speakers and around 300 researchers (Figure 1, Table 1 and Table 2). It is not only a large and prestigious scientific forum, attracting the atten- tion of the Vietnamese scientific community but also a place to meet, exchange, and disseminate the latest developments in the field of SPMS. It was held every two years continuously from 1995. Generally, solid physics and material science fields are always con- cerned topic of many scientists, which has diverse ac- tivities and outstanding achievements in both funda- mentals and applications in Vietnam. SPMS-2019 is not only fundamental materials but also presents the application of the developed mate- rials in energy conversion and storage device, pho- tocatalysis, catalysis, health care, etc. To share re- search about graphene application, Prof. Strek, ed- itor of Journal Alloys and Compounds, who has re- searched graphene fundamentals and applications for decades 1,2, gave a presentation on graphene for pho- tonics and lighting as shown in Figure 2. In the pre- sentation, the intensity of the emission surges expo- nentially with the rise of laser power density, satu- rating at ca. 1.5 W and being characterized by sta- ble emission conditions. Furthermore, the white light emission is spatially confined to the focal point di- mensions of the illuminating laser light. The emis- sion intensity could be controlled owing to the ex- treme reliance on the white light emission on the elec- tric field intensity. The electric field intensity at ca. 0.5 V/mm was able to decline the white light inten- sity by approximately 50%. This presentation con- cluded that the laser-induced white light emission might be well utilized in new types of white light sources. Given that the talk of Prof. Strek presented the fundamental materials which are based on car- bon materials, Dr. Van-Duong Dao (Phenikaa Uni- versity) presents the use of carbon materials in har- vesting energy and fresh-water via solar-driven wa- ter evaporation system. Recent improvements and difficulties in applying a solar-driven water evapo- ration system were first presented (Figure 3)3. The invited speaker also presented the recent develop- ment of dual dual-function nanogenerators that are based on a natural structure as Limnobium laeviga- tum, ferns, cone, etc. The developed nanogenerators made of multi-walled carbon nanotubes-coated cel- lulose paper in ponds, lakes, rivers, seas, etc. any time of a day could generate electricity and fresh- water efficiently. It utilizes solar energy to produce fresh-water from any polluted or saline water source at a significant production rate and generates high Cite this article : Dao V, Chien N D, Strek W. Enthusiastic discussions on solid physic and material science at SPMS2019. Sci. Tech. Dev. J.; 23(2):490-498. 490 History  Received: 2020-03-19  Accepted: 2020-04-03  Published: 2020-04-09 DOI : 10.32508/stdj.v23i2.1768 Copyright © VNU-HCM Press. This is an open- access article distributed under the terms of the Creative Commons Attribution 4.0 International license. Science & Technology Development Journal, 23(2):490-498 electric power in the hundreds mW
m2 range us- ing the evaporation-enhanced capillary water stream of the structure under ambient daylight conditions. Because these nanogenerators acquire all required en- ergy from the environment, it will find immediate applications in providing electricity and fresh-water for living and systemmaintenance in water-abundant isolated locations such as islands or wetlands. The findings of this work represent a significant step for- ward because they pointed out the concept of har- vesting consistently electricity during evaporation the whole day and with any weather conditions4. Note that before presenting the harvesting fresh-water from a solar-driven water evaporation system, the invited speaker presented a new technology for synthesiz- ing nanohybrid materials and their applications on next-generation solar cells, energy storage devices, so- lar to steam generation, and photocatalysis which is called dry plasma reduction5. Note that this tech- nology can work under atmospheric pressure, low temperature, short time reduction, and without us- ing any toxic chemical reagents (Figure 4). Sev- eral examples for fabricating transparent electrodes based on Pt nanoparticles on FTO glass substrate, Pt/CVD-grown graphene on FTO glass substrate, and Pt-graphene/Ag nanowire on glass have been care- fully described 6,7. The water harvesting issue is continued by a dis- cussion of Prof. Phan Bach Thang (Center for Innovative Materials and Architectures (INOMAR), Vietnam National University, HoChiMinh city (VNUHCM)). As an oral presenter, the device based on a porous metal-organic framework {MOF-801, [Zr6O4(OH)4(fumarate)6]} can capture water from the atmosphere at ambient conditions by using low-grade heat from natural sunlight at a flux of less than one sun (1 kilowatt per square meter)8. This system can harvest 2.8 liters of water per kilogram of MOF per day at relative humidity levels as low as 20% without additional input of energy (Figures 5a-c) 8. A prototype using up to 1.2 kg of MOF-801 was tested in the laboratory and later in the desert of Arizona, USA. It generated 100 g of water per kilogram of MOF-801 per day-and-night cycle with only natural cooling and input energy, namely ambient sunlight9. Note that by using an aluminum-based MOF-303, the device can deliver more than twice the amount of water. The desert experiment uncovered key parameters of the energy, material, and air requirements for efficient production of water from desert air, even at a subzero dew point. Prof. Thang’s center also synthesized a lot of MOF with the named VNU-number such as VNU-1, VNU-2, etc. and their application in energy, environment, catalysis, health care10–17. Dr. Phong D. Tran (University of Science and Tech- nology of Hanoi, Vietnam) described the current state-of-the-art of the solar water splitting research. The current progress in the development of noble- metal free catalysts18–22, nanostructured light har- vesters23,24, as well as the catalyst/light harvester as- semblage for artificial leaf construction24, was also presented. Dr. Tran’s group found that the operation of a bias-free leaf displaying 2% solar-to-H2 conver- sion yield in pH 7 phosphate buffer solution and un- der 1 Sun illumination. Prof. Sunglae Cho (University of Ulsan, Korea) discussed the preparation of high- quality single crystal and a thin film of 2-dimensional materials (2D) including SnSe, SnSe2, InSe, In2Se3, and (BSb)2(SeTe)3, etc. The oral presentations continued from Sunday to Monday afternoon. The coffee breaks and poster sec- tions were filled with cozy discussions and network- ing. SPMS2019 was a fantastic meeting thanks to the participants from all over the world and the host who organized and prepared carefully for the conference. Especially, thanks are owed to the chairs of each con- ference day: Prof. Nguyen Duc Chien, Prof. Nguyen Dai Hung, Prof. Do Ngoc My, Prof. Le Quoc Minh, Prof. Nguyen Hoang Luong, and chair sections. The conference hopes that all participants had fruit- ful experience and were motivated by many impres- sive ideas from SPMS2019. SPMS2021 will be held after the next two years. Based on the experience of the long history, the organization intends to organize amore valuable conference that has an additional sec- tion for abroad researchers. We hope that SPMS2021 will be a remarkable chance for many scientists who are interested in solid physic and materials science and their application. It would be a pleasure to meet again at SPMS2021. 491 Science & Technology Development Journal, 23(2):490-498 Fi g u re 1: P h ot og ra p h ofi nv it ed sp ea ke rs an d p ar ti ci p an ts at th e V ie tn am N at io n al Co n fe re n ce of So lid P hy si cs an d M at er ia ls Sc ie n ce 20 19 (S PM S 20 19 ). 492 Science & Technology Development Journal, 23(2):490-498 Figure 2: Prof. Strek giving talks to the conference; The visible and near-infrared emission of graphene foam excited by 975 nm laser diode at high excitation density 7000W/cm2 2. Figure 3: Schematic illumination of the development of solar-driven interfacial steamgeneration system 3. 493 Science & Technology Development Journal, 23(2):490-498 Figure 4: Dry plasma reduction technology. Table 1: Plenary talks for SPMS2019 Plenary talks Title Wiesław Stręk (Polish Academy of Sciences, Poland) Graphene for photonics and lighting Phong D. Tran (University of Science and Technology of Hanoi, Vietnam) Toward construction of a viable artificial leaf for solar H2 generation Sunglae Cho (University of Ulsan, Korea) High quality 2D layered materials: Growth of single crystal and epitaxial thin film Phan BachThang (Vietnam National Science in Ho Chi Minh City, Vietnam) Porous materials and their applications in energy- environment-catalysis-health care Van-Duong Dao (Phenikaa University, Vietnam) All-weather harvesting energy and fresh-water via solar-driven water evaporation 494 Science & Technology Development Journal, 23(2):490-498 Figure 5: Proof-of-concept water-harvesting prototype 8. (a) Image of a water-harvesting prototype with ac- tivated MOF-801 with a weight of 1.34 g, a packing porosity of ~0.85, and outer dimensions of 7 by 7 by 4.5 cm. (b) Formation and growth of droplets of water as a function of MOF temperatures (TMOF) and local time of day. (c) Representative temperature profiles for the MOF-801 layer (experimental, red solid line; predicted, red dashed line), ambient air (gray line), the condenser (blue line), and the ambient dew point(green line), as well as solar flux (purple line), as functions of time of day (14 September 2016). The background color map represents the esti- mated RH from the condenser saturation pressure and the layer temperature, and the upper abscissa represents the water uptake predicted from the theoretical model as afunction of time (lower abscissa). Because of losses from the absorber solarabsorptance (a, 0.91) and the glass plate solar transmittance (t, 0.92), 84% ofthe solar flux shown in (c) was used for desorption. The layer temperature and full water-harvesting potential based on com- plete desorption were predicted using the solar flux and environmental conditions at the end of the experiment (dashed lines). The fluctuations of the solar flux from 10:20 to 11:00were due to the presence of clouds. Isotherms of MOF-801 and design of the MOF-based water harvester for water production fromdesert air 9. (d)Water sorp- tion isotherms (adsorption, filled symbols; desorption, open symbols) of MOF-801 andMOF-801/G at 15C (blue), 25C (gray), and 85C (red). In comparison to previously reportedisotherms for MOF- 801, a shift of the inflection point to higher relativepressures, a lower maximum capacity, and hysteresis were observed. These findings are related to a high degree of single crystallinity of thematerial 23 . BlendingMOF-801with graphite led to a decrease of the gravimetric capacity corresponding to the added weight, while the general shape of the isothermwas fully retained. (e) Schematic of the water harvester consisting of a water sorption unit and a case. During the night, the cover of the case isopened, allowing the MOF to be saturated with moisture from desert air. Duringthe day, the case is sealed to create a closed system. Humid hot air flows fromtheMOF to the condenser and is cooled downby heat rejection to the surroundings. When the dewpoint is reached, condensation occurs, and liquidwater collects at the bottom of the case. 495 Science & Technology Development Journal, 23(2):490-498 Table 2: Invited talks for SPMS2019 Invited speaker Title Phuoc Huu Le (Ton Duc Thang University, Viet- nam) Magnetotransport properties of bismuth chalcogenide topological insulators: a review Nguyen Minh Vuong (Quy Nhơn University, Vietnam) Pt/ZnO hierarchical nanostructures as efficient sensing materials for methanol sensors. Nguyen Duc Anh (University of Science and Technol- ogy of Hanoi, Vietnam) The durability enhancement of amorphous molybdenum sulfide toward proton reduction reaction in the presence of poly(3,4- ethy- lene dioxythiophene). Nguyen Tuan Son (University of Transport and Com- munications, Vietnam) Fabrication of micro supercapacitor electrodes on the flexible sub- strate by direct laser writing technique. PhanThanh Hai (Quy Nhơn University, Vietnam) Covalent modification of graphene and graphite using diazonium chemistry LeThi Ly (University of Science and Technol- ogy of Hanoi, Vietnam) Simple synthesis nanotube Cu2MoS4 for both hydrogen evolution reaction and magnesium-ion batteries Vu Ngoc Hung (ITIMS, Hanoi University of Science and Technology, Vietnam) Relaxor ferroelectric PLZT thin films fabricated by sol-gel tech- nique for pulsed-power energy storage applications. Pham Van Viet (University of Science, VNU-HCM) Activation Peroxymonosulfate by visible-light over Ag/ZnO het- erojunction (Hoạt hoá Peroxymonosulfate bởi ánh sáng khả kiến sử dụng vật liệu nano cấu trúc dị thể Ag/ZnO) Tran Nhu Hoa (University of Science, VNU-HCM) A high sensitivity optical fiber sensor for determination of heavy metals (Cu, Pb, Cd, Mn) in water pollutants (Cảm biến quang học có độ nhạy cao xác định hàm lượng kim loại nặng (Cu, Pb, Cd, Mn) trong nước uống, nước ô nhiễm.) NguyenThi Ngoc Anh (Vietnam Academy of Science and Technology, Vietnam) Study the magnetic anisotropy and the dependence of the transla- tion field perpendicular to the multilayer thin film (Nghiên cứu tính dị hướng từ và sự phụ thuộc của trường trao đổi dịch theo phương vuông góc của màng mỏng đa lớp) DoThi Kim Anh (Vietnam National University, Viet- nam) Effect of residual La on crystal structure and magnetic properties in LaxFe11:05Si1:95 (Ảnh hưởng của sự dư La lên cấu trúc tinh thể và tính chất từ trong hợp chất LaxFe11:05Si1:95) Nguyen Viet Long (Saigon University, Vietnam) Synthesis, structure, and properties of gold nanoparticle materials by improved Polyol method (Tổng hợp, cấu trúc, và tính chất hệ vật liệu hạt nano vàng bằng phương pháp Polyol cải tiến) Dang Ngoc Toan (Duy Tan University, Vietnam) Establishing the mechanism of formation of the magnetic order state in Ca3Co2O6 material. (Thiết lập cơ chế hình thành của trạng thái trật tự từ trong vật liệu Ca3CO2O6) Nguyen Xuan Sang (Saigon University, Vietnam) Optical and photocatalyst properties of TiO2 and graphene nan- otube combination with heat treatment. (Tính chất quang và quang xúc tác của tổ hợp ống nano TiO2 và graphene có xử lý nhiệt) Continued on next page 496 Science & Technology Development Journal, 23(2):490-498 Table 2 continued Tran DangThanh (Vietnam Academy of Science and Technology, Vietnam) Structure and magnetic properties of crystalline nanomaterials Pr0:5Sr0:5MnO3 (Cấu trúc và tính chất từ của vật liệu nano tinh thể Pr0:5Sr0:5MnO3) NguyenThanh Binh (Vietnam Academy of Science and Technology, Vietnam) Using fluorescence resonance energy transmission method to de- tect Aflatoxin (Sử dụng phương pháp truyền năng lượng cộng hưởng huỳnh quang phát hiện Aflatoxin) 497 Science & Technology Development Journal, 23(2):490-498 COMPETING INTERESTS The author(s) declare that they have no competing in- terests. ACKNOWLEDGMENT This research is funded by Vietnam National Foun- dation for Science and Technology Development (NAFOSTED) under grant number 103.02-2018.27. REFERENCES 1. 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