Article
Multidisciplinary Sciences
Po-Cheng Tsai, Chun-Wei Huang, Shoou-Jinn Chang, Shu-Wei Chang, Shih-Yen Lin
Summary: In this study, in-plane gate transistors based on a MoS2/graphene heterostructure were demonstrated. The graphene functioned as the channel while the MoS2 acted as a passivation layer. The results showed that the MoS2 effectively passivated the graphene channel, resulting in weak hysteresis of the device. Additionally, comparison studies between devices with and without removal of the MoS2 layer revealed that the device with direct electrode/graphene contact exhibited lower contact resistance, higher drain current, and enhanced field-effect mobility, indicating the presence of more carriers in the channel for better conductivity.
SCIENTIFIC REPORTS
(2023)
Article
Multidisciplinary Sciences
Hangyel Kim, Jong Hun Kim, Jungcheol Kim, Jejune Park, Kwanghee Park, Ji-Hwan Baek, June-Chul Shin, Hyeongseok Lee, Jangyup Son, Sunmin Ryu, Young -Woo Son, Hyeonsik Cheong, Gwan-Hyoung Lee
Summary: Van der Waals (vdW) epitaxy is employed to grow epilayers with different symmetries on graphene, which enhances the properties of graphene through the formation of anisotropic superlattices and strong interlayer interactions. In this study, we demonstrate in-plane anisotropy in graphene by growing molybdenum trioxide layers with an elongated superlattice using vdW epitaxy. The grown molybdenum trioxide layers induce high p-doping in graphene, maintaining a high carrier mobility. The asymmetrical band distortion caused by molybdenum trioxide deposition leads to in-plane electrical anisotropy. Our findings present a method to induce anisotropy in symmetric two-dimensional materials through the formation of asymmetric superlattices.
Article
Nanoscience & Nanotechnology
Po-Cheng Tsai, Coung-Ru Yan, Shoou-Jinn Chang, Shih-Yen Lin
Summary: Bottom-gate transistors with mono-layer MoS2 channels and polycrystalline antimonene source/drain contact electrodes are successfully fabricated. The devices exhibit significant improvement in performance, including high field-effect mobility and large ON/OFF ratio. Moreover, increased photocurrents are observed in the MoS2 transistor under light irradiation.
Article
Materials Science, Coatings & Films
Lu Lu, Weiwei Meng, Yingmin Wang, Jianbing Qiang, Shao-Bo Mi
Summary: The atomic-scale structure properties of the epitaxial growth of wurtzite ZnO film on an a-plane sapphire substrate were investigated using transmission electron microscopy. A crystallographic orientation relationship between the ZnO film and alpha-Al2O3 substrate was determined. Different heterointerface structures and ZnO domains with opposite lattice polarity were formed due to the two types of oxygen-terminated alpha-Al2O3 substrate surfaces. The coalescence of opposite polarity domains resulted in the appearance of inversion domain boundaries and kinks during the propagation of these boundaries.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Engineering, Aerospace
Deepak Sharma, Somashekhar S. Hiremath
Summary: The flexural performance of novel bird's feather-inspired cellular panels has been studied, focusing on the effect of unit cell length and orientation on stiffness, strength, energy absorption, and crack propagation. Experimental and finite element modeling results demonstrate the improved flexural properties of the new bionic panels.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Crystallography
Kazuhiro Mochizuki, Hiroshi Ohta, Tomoyoshi Mishima
Summary: The reported substrate-misorientation and growth-temperature dependences of alloy composition in metalorganic vapor-phase epitaxially grown c-plane InGaN were analyzed using least-squares regression. The analysis revealed that the equilibrium indium content at the kink site decreased with increasing growth temperature, and the relaxation time for the indium content at the step-edge site was reduced with increasing temperature. This analysis can be improved with more experimental results and contribute to practical predictions of compositional variation in alloy semiconductors.
JOURNAL OF CRYSTAL GROWTH
(2023)
Article
Nanoscience & Nanotechnology
Florian Pantle, Simon Woerle, Monika Karlinger, Felix Rauh, Max Kraut, Martin Stutzmann
Summary: Nanostructures, such as GaN nanofins, are sensitive to their ambient conditions due to their large surface-to-volume ratio. This article presents a systematic study on the environmental sensitivity of the electrical conductivity of GaN nanofins and identifies oxygen and water as responsible for reducing the electrical current through GaN nanofins. The results also reveal the complexity of water adsorption on GaN surfaces and the importance of reproducible pre-treatment and surface passivation.
Article
Materials Science, Multidisciplinary
J. Noder, C. Butcher
Summary: The commonly used forming limit curve (FLC) does not consider the delay in plastic instability caused by bending and tool contact pressure. The General Incremental Stability Criterion (GISC) has revealed the influence of boundary conditions on tensile instabilities. However, the effect of radial bending stresses and tool contact pressure on necking is still unclear.
MECHANICS OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Mahgolzahra Kamari, Randeep Rakwal, Takuya Yoshida, Satoru Tanigawa, Seita Kuki
Summary: The study found that landing with a deeper knee flexion angle (LFL) leads to smaller impact forces, reducing the risk of non-contact ACL injury.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Multidisciplinary
S. Balakrishnan, A. R. Veerappan, S. Shanmugam
Summary: This study systematically investigated the plastic collapse load of 90 degrees structurally defected pipe bends under in-plane opening bending using three-dimensional finite element analyses. It was found that ovality and throughwall axial crack significantly affected the plastic collapse moment (PCM) of pipe bends, and their combined effect was almost doubled. The vulnerability of ovality and TAC defects decreased with an increase in bend radius and thickness in pipe bend models with thin walls and short bend radius.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2021)
Article
Construction & Building Technology
Qian Gu, Rendi Wu, Jing Ren, Yuan Tan, Shui Tian, Siqing Wen
Summary: This study investigated the in-plane force transmission performance of precast double-face superposed shear walls with horizontal joints using the three-point bending beam test. The effects of the net distance between dowel steel bars and the inner side of the prefabricated wall panel, as well as the span-to-depth ratio, were evaluated. The results showed that the force transmission performance was influenced by the concrete interfaces and the optimal net distance was found to be 20 mm. The study provides recommendations for the engineering design and construction of the DPCW system.
JOURNAL OF BUILDING ENGINEERING
(2022)
Article
Chemistry, Physical
Yih-Farn Kao, Shi-Rong Chen, Jrjeng Ruan
JOURNAL OF ALLOYS AND COMPOUNDS
(2018)
Article
Polymer Science
Ching-Feng Wu, Jui-Hsien Lo, Chen-An Wang, Jrjeng Ruan
MACROMOLECULAR CHEMISTRY AND PHYSICS
(2018)
Article
Materials Science, Multidisciplinary
Jia-Hong Pan, Ching-Feng Wu, Chen-An Wang, Kun-Ta Lin, Jrjeng Ruan
MATERIALS CHEMISTRY AND PHYSICS
(2018)
Article
Materials Science, Ceramics
Yi-Wei Chen, Jr-Jeng Ruan, Jyh-Ming Ting, Yen-Hsun Su, Kao-Shuo Chang
Summary: This study demonstrates the fabrication and superior piezoelectric performance of high-entropy Ba(Ti,Hf,Zr,Fe,Sn)O-3 films. Sample A exhibits the highest piezoelectric coefficient among all samples, attributed to high crystallinity, slightly textured polycrystalline structure, and cocktail effects. Enhanced piezoelectricity was achieved for both high-entropy oxide and medium-entropy oxide samples after poling, indicating their ferroelectric effect.
CERAMICS INTERNATIONAL
(2021)
Article
Chemistry, Multidisciplinary
Thi Xuyen Nguyen, Yen-Hsun Su, Chia-Chun Lin, Jrjeng Ruan, Jyh-Ming Ting
Summary: A new high entropy material, HEG, synthesized via a simple solvothermal process, shows excellent oxygen evolution reaction (OER) activity and outperforms binary-, ternary-, and quaternary-metal glycerates. The significance of synergistic effect is demonstrated in modifying electronic structure and coordination environment. Moreover, HEG exhibits outstanding stability and durability in alkaline electrolyte and shows good overall water splitting performance in HEG@HEG electrolyzer.
Article
Polymer Science
Zheng-Kai Huang, Yi-Kang Lan, Kun-Ta Lin, Chia-Hung Pan, Ching-Feng Wu, Horng-Long Cheng, Wei-Yang Chou, Jrjeng Ruan
Summary: The tuning of solvent composition can drive graphene sheets to scroll steadily in solutions, resulting in nanoscrolls and comb-like superstructures. The interlayer distance and curvature of central voids in these graphene nanoscrolls are influenced by the average radius of adsorbed molecular coils and the bending rigidity of graphene hexagonal structural units.
Article
Nanoscience & Nanotechnology
Wei-Yang Chou, Sheng-Kuang Peng, Fu-Hsuan Chang, Horng-Long Cheng, Jr-Jeng Ruan, Tsung-Yeh Ho
Summary: This study introduces Ni atom dopants and adjusts the growth temperature to achieve a series of ferromagnetic organic semiconductor (FOS) films with room-temperature ferromagnetic properties, one of which has a maximum coercivity of 257.6 Oe. The spin-exchange interaction between a Ni atom and a pentacene molecule is detected, supporting the development of new spintronic devices with structural flexibility and room-temperature ferromagnetism.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Jia-Hong Pan, Kun-Ta Lin, Wei-Ting Li, Yi-Chang Wu, Jia-Han Lyu, Jyh-Ming Ting, Kao-Shuo Chang, Yen-Hsun Su, U-Ser Jeng, Jrjeng Ruan
Summary: The enhanced secondary crystallization of ferroelectric polymer PVDF-TrFE above Curie temperature leads to crystal association and sequential coalescence, resulting in oriented stacking arrays of crystals with high dielectric constant in thin films.
APPLIED SURFACE SCIENCE
(2021)
Article
Physics, Applied
Wei-Yang Chou, Sheng-Kauang Peng, Meng-Hung Chen, Horng-Long Cheng, Jr-Jeng Ruan, Yu-Hsuan Huang
Summary: In this study, low-voltage organic memory transistors (LOMTs) with improved charge storage and erasing capabilities were fabricated using a blend of polymeric materials and a porous structure. The findings contribute to the development of high-performance LOMT devices for future flexible electronics.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Wei-Yang Chou, Po-Hsiang Fang, Fu-Chiao Wu, Yi-Chen Tien, Hwo-Shuenn Sheu, Horng-Long Cheng, Jrjeng Ruan
Summary: This study explored the fabrication and crystallization of low-voltage-driven organic field-effect transistors (OFETs) using an organic polymer as the active layer. Crystalline PBTTT-C-14 with excellent electrical performance was obtained through a thermal gradient system, demonstrating the importance of microstructure in determining the opto-electronic properties of polymer semiconductors.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Nanoscience & Nanotechnology
Shih-Wei Chiu, An Hsu, Lei Ying, Yong-Kang Liaw, Kun-Ta Lin, Jrjeng Ruan, Ifor D. W. Samuel, Ben B. Y. Hsu
Summary: Researchers propose a solution to the challenge of charge transport imbalance in bilayer organic light-emitting field-effect transistors (OLEFETs) by introducing a specially designed transparent organic/inorganic hybrid contact. Numerical simulations show that this design can steadily accumulate electrons injected into the emissive polymer, allowing the light-emitting interface to effectively capture more holes even when the hole current increases.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Kun-Ta Lin, Wen-Hui Cheng, Horng-Long Cheng, Hsin-Hui Lin, Wei-Yang Chou, Bang-Yu Hsu, Cheng-An Mao, Yu-Cyuan Hou, Jrjeng Ruan
Summary: The oriented coalescence within monolayers of polymer ferroelectric crystals can be adjusted by the roughness, leading to changes in piezoelectric responses and phase polarity. The piezoelectric responses of polymer ferroelectric crystals can be further enhanced by depositing P3HT-wrapped MoS2 sheets. The interaction between P3HT-wrapped MoS2 sheets and ferroelectric lamellar crystals results in mutual polarization, leading to improved photocatalytic reactions.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Kun-Ta Lin, Sheng-Hao Huang, Wei -Ting Li, Hsin-Hui Lin, Chun-Jen Su, U-Ser Jeng, Meng-Che Ko, Jrjeng Ruan
Summary: Zinc oxide nanorods are grown from zinc acetates dispersed within poled polymer ferroelectric lamellar crystals, revealing a new type of non-contact epitaxial relationship through antiparallel match between crystal dipoles. The phase interactions between antiparallel crystal dipoles significantly enhance reversible piezoelectric strains and increase the piezoelectric constants of polymer ferroelectric crystals by one order of magnitude. The presence and size of interacting crystals, along with the separation distance, play a critical role in the achieved levels of piezoelectric responses.
APPLIED SURFACE SCIENCE
(2023)
Proceedings Paper
Chemistry, Applied
Devi Eka Septiyani Arifin, J. J. Ruan
INTERNATIONAL CONFERENCE ON CHEMISTRY AND MATERIAL SCIENCE (IC2MS) 2017
(2018)
Article
Chemistry, Multidisciplinary
Bo-Ren Lin, Horng-Long Cheng, Hung-Han Lin, Fu-Chiao Wu, Jia-Hui Lin, Wei-Yang Chou, Jrjeng Ruan, Yu-Wu Wang
MATERIALS CHEMISTRY FRONTIERS
(2020)
