Article
Nanoscience & Nanotechnology
Sreejith Nair, Zhifei Yang, Dooyong Lee, Silu Guo, Jerzy T. Sadowski, Spencer Johnson, Abdul Saboor, Yan Li, Hua Zhou, Ryan B. Comes, Wencan Jin, K. Andre Mkhoyan, Anderson Janotti, Bharat Jalan
Summary: A study shows that epitaxial strain can be used to enhance the metal oxidation chemistry and thin-film growth of metal oxide thin films. Platinum group metal oxides are promising materials for future electronics and spintronics. However, their synthesis as thin films is challenging due to low vapor pressures and oxidation potentials. Using Ir as an example, the researchers demonstrate how epitaxial strain can control its oxidation chemistry, enabling phase-pure Ir or IrO2 films. The study also reveals the generality of this principle by showing the effect of epitaxial strain on Ru oxidation.
NATURE NANOTECHNOLOGY
(2023)
Article
Chemistry, Physical
Wentao Chen, Gyoko Nagayama
Summary: In this study, it is found through simulation that phonon transmission can be induced across a nanogap via quasi-Casimir coupling using adsorbed liquid layers on solid surfaces. This finding is of great significance for future nanoscale energy transport and thermal management.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Shishin Mo, Tsukasa Katayama, Akira Chikamatsu, Miho Kitamura, Koji Horiba, Hiroshi Kumigashira, Tetsuya Hasegawa
Summary: By applying 0.5% tensile strain to c-axis-oriented Mn2Mo3O8 epitaxial films, a significant increase in spontaneous magnetization was observed, leading to a noncollinear spin structure with tilted Mn2+ magnetic moments compared to the bulk material. The study suggests that the direction of the Mn2+ magnetic moment is sensitive to tensile strain, indicating a potential for manipulating magnetic properties in thin films.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Falk Niefind, Qian Mao, Nadire Nayir, Malgorzata Kowalik, Jung-Joon Ahn, Andrew J. Winchester, Chengye Dong, Rinu A. Maniyara, Joshua A. Robinson, Adri C. T. van Duin, Sujitra Pookpanratana
Summary: This study investigates the de-intercalation processes of 2D Ag and Ga metals sandwiched between bilayer graphene and SiC. The results show distinctly different dynamics for Ag and Ga, with Ag exhibiting reversible de- and re-intercalation through circular defects, whereas Ga shows irreversible de-intercalation with faster kinetics influenced by the non-circular shape of the defect. Molecular dynamics simulations and calculations support these findings and provide insights into the role of the thermophysical properties of the intercalants and their interaction with defective graphene.
Article
Chemistry, Physical
Leonid A. Chernozatonskii, Victor A. Demin, Dmitry G. Kvashnin
Summary: A novel carbon nanostructure, Moire diamones on graphene, with spin density localization feature, was proposed for potential applications in the field of controllable spintronic devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Ying Li, Wanguo Hou
Summary: A thermodynamic model called the dynamic bonding equilibrium (DBE) model was developed to describe the structure of adsorbed layers, and its rationality was confirmed by experimental data. The model provides a feasible approach for obtaining information about the structure of adsorbed layers at solid/liquid interfaces.
Article
Nanoscience & Nanotechnology
Mingjie Tong, Yan Jiang, Liya Wang, Chengyuan Wang, Chun Tang
Summary: The study reveals that nanoporous graphene exhibits unique frictional characteristics, with the size of the nanopore playing a key role in determining the maximum frictional force. Negative friction is observed when the silicon tip scans towards the center of the nanopore.
Article
Physics, Applied
Grzegorz Sadowski, Yongbin Zhu, Rui Shu, Tao Feng, Arnaud le Febvrier, Denis Music, Weishu Liu, Per Eklund
Summary: In this study, Mg3Bi2 films with good thermoelectric properties were successfully synthesized at low temperatures, and the epitaxial growth relationship between Mg3Bi2 and the substrate was observed.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Physical
Tomasz Andrearczyk, Janusz Sadowski, Jerzy Wrobel, Tadeusz Figielski, Tadeusz Wosinski
Summary: The study found that adding 1% Bi atoms to the (Ga,Mn)(Bi,As) epitaxial layers significantly enhances the strength of the planar Hall effect. Additionally, Bi incorporation into the layers enhances their coercive fields and uniaxial magneto-crystalline anisotropy. This material may have potential applications in spintronic devices.
Article
Chemistry, Multidisciplinary
Arun Kumar, Raimondo Cecchini, Lorenzo Locatelli, Claudia Wiemer, Christian Martella, Lucia Nasi, Laura Lazzarini, Roberto Mantovan, Massimo Longo
Summary: This study achieved the optimized large-area growth of Bi2Te3 epitaxial layers on unbuffered i-Si(111) substrates via MOVPE and identified the key factors for maximizing layer quality. The grown Bi2Te3 thin layers exhibit high crystal quality, stoichiometry, uniformity, and topological insulator properties, showing potential for technology transfer to innovative devices.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Chemistry, Multidisciplinary
Ruixue Feng, Dong Li, Hongzhou Yang, Chengyu Li, Yunxuan Zhao, Geoffrey I. N. Waterhouse, Lu Shang, Tierui Zhang
Summary: In this study, a low-cost Pt atomic layers catalyst was successfully prepared on a CrN substrate via thermal ammonolysis method. The catalyst exhibited excellent activity and durability, making it suitable for various applications.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Hadass S. Inbar, Dai Q. Ho, Shouvik Chatterjee, Aaron N. Engel, Shoaib Khalid, Connor P. Dempsey, Mihir Pendharkar, Yu Hao Chang, Shinichi Nishihaya, Alexei V. Fedorov, Donghui Lu, Makoto Hashimoto, Dan Read, Anderson Janotti, Christopher J. Palmstrom
Summary: This study investigates the evolution of band topology in biaxially strained GdSb(001) epitaxial films using angle-resolved photoemission spectroscopy and density functional theory. The research reveals that the gap between the hole and the electron bands decreases as biaxial strain changes from tensile to compressive.
Article
Chemistry, Multidisciplinary
Sherif Abdulkader Tawfik, Hang Tran, Michelle J. S. Spencer
Summary: The study investigates the crucial roles of surface oxygen in the sensitivity of ZnO nanostructures towards formaldehyde through density functional theory and ab initio molecular dynamics simulations. Surface oxygen facilitates both the presence of charge trap states and the dissociative chemisorption of formaldehyde on the surface, leading to multiple reaction products and enhanced recyclability. The research not only confirms experimental reactions, but also provides insights into the gas-surface reaction mechanism of ZnO nanostructure-based gas sensors.
NANOSCALE ADVANCES
(2022)
Article
Engineering, Multidisciplinary
ZhanLei Huo, Yang Chen, ZhengRong Guo, TienChong Chang
Summary: Through molecular dynamics simulations, it was found that in commensurate contact of graphene layers, the main energy dissipation mechanism for small-sized graphene is not caused by stick-slip, but rather by lattice distortion induced by the moire superlattice structure and variation of entropy of the contacting landscape.
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2021)
Article
Chemistry, Multidisciplinary
Hamed Emamy, Francis W. Starr, Sanat K. Kumar
Summary: Strong attractions between polymer-nanoparticles can lead to the spontaneous formation of a polymer layer with distinct dynamic characteristics at the nanoparticle interface. When investigating how nanoparticle mobility affects the signature of the bound layer, it was found that for small, relatively mobile nanoparticles, the bound layer is linked to the motion of the nanoparticle, causing the relaxation signature of the bound layer to essentially disappear in the intermediate scattering function.
Article
Engineering, Electrical & Electronic
Chuan-Pu Chou, Chin-Yu Chen, Kuen-Yi Chen, Shih-Chieh Teng, Jia-Hong Huang, Yung-Hsien Wu
IEEE ELECTRON DEVICE LETTERS
(2017)
Article
Materials Science, Coatings & Films
Yu-Wei Lin, Jia-Hong Huang, Wei-Jen Cheng, Ge-Ping Yu
SURFACE & COATINGS TECHNOLOGY
(2018)
Article
Materials Science, Coatings & Films
Jia-Hong Huang, Kun-Lin Kuo, Ge-Ping Yu
SURFACE & COATINGS TECHNOLOGY
(2019)
Article
Materials Science, Coatings & Films
Jia-Hong Huang, You-Fu Chen, Ge-Ping Yu
SURFACE & COATINGS TECHNOLOGY
(2019)
Article
Materials Science, Multidisciplinary
Chung-Kai Wu, Jia-Hong Huang, Ge-Ping Yu
MATERIALS CHEMISTRY AND PHYSICS
(2019)
Article
Materials Science, Multidisciplinary
Jia-Hong Huang, Cheng-Han Lin, Ge-Ping Yu
Article
Materials Science, Coatings & Films
Yu-Wei Lin, Po-Chun Chih, Jia-Hong Huang
SURFACE & COATINGS TECHNOLOGY
(2020)
Article
Materials Science, Multidisciplinary
I-Sheng Ting, Jia-Hong Huang
Summary: This study investigated the incipient oxidation behavior of ZrO2-coated Zircaloy-4 and evaluated the feasibility of producing a ZrO2 protective layer by vacuum annealing of ZrN coating. Results showed that ZrO2 coatings displayed good adhesion on Zircaloy-4 substrate and offered oxidation resistance, with differences observed at temperatures above 800 degrees C. The uniform distribution of oxide phases in the specimens varied, and producing a ZrO2 coating on Zircaloy-4 through vacuum annealing of ZrN-coated Zircaloy-4 was found to be infeasible.
MATERIALS CHEMISTRY AND PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Jia-Hong Huang, Liang-Ju Wei, I-Sheng Ting
Summary: The study evaluated the fracture toughness of VN hard coatings and its dependence on preferred orientation. Coatings with (200) texture showed higher fracture toughness, consistent with higher residual stress. The crack path in VN coatings, regardless of texture, consisted of horizontal and zigzag regions.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Materials Science, Coatings & Films
Jia-Hong Huang, I-Sheng Ting, Ting-Wei Zheng
Summary: The purpose of this study was to investigate the stress relief and energy relief efficiency of metal interlayers in bilayer ZrN/Zr and ZrN/Ti thin films. Experimental results showed that Ti interlayer provided more significant stress relief compared to Zr interlayer. Additionally, the thickness of the interlayer affected Delta sigma% and the energy relief efficiency xi tot, which was also influenced by the stress level in the ZrN coating.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Matthew Wei-Jun Liu, Jia-Hong Huang
Summary: This study investigates the stress relief achieved by different types of coating architectures and evaluates the energy relief efficiency using an energy-balance physical model. The results show that introducing a TiN/Ti interlayer can significantly improve stress relief in the TiZrN coating. A tri-layer specimen with a 300-nm TiN layer exhibits the largest stress relief among all specimens. The energy-balance model reveals that the TiN transitional layer acts as a channel to transfer stored elastic energy to the Ti interlayer, resulting in a larger fraction of stress relief in the TiZrN coating.
Article
Materials Science, Coatings & Films
Yiqun Feng, Tsai-Fu Chung, Jia-Hong Huang
Summary: The objective of this research was to investigate the influence of nitrogen flow rate on the structure and mechanical properties of (V,Mo)N thin films. Different nitrogen flow rates were used to deposit the thin films on Si (100) substrate. The results revealed that the N/metal ratio and microstructure of the thin films varied with the nitrogen flow rate. The hardness and fracture toughness of the films were affected by the presence of Mo metal phase and the N/metal content.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Coatings & Films
Jia-Hong Huang, I. -Sheng Ting, Peng-Wen Lin
Summary: This study measured the stress relief extent of a hard coating by a metal interlayer in a bilayer system. An energy-balance model was used to evaluate the energy relief efficiency (xi(tot)) by the interlayer. The results showed that xi(tot) increased with increasing stress in the TiN coating and that the energy relief was mostly contributed from the TiN coating.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Engineering, Mechanical
Fong-Zhi Chen, I-Sheng Ting, Wei-Zen Kang, Yu-Wei Lin, Jia-Hong Huang
Summary: In this study, the deposition process of MoNx thin films using unbalanced magnetron sputtering (UBMS) was optimized through Taguchi design of experiment (DOE). Single-variable experiments were conducted to investigate the effect of the sensitive parameter derived from the Taguchi experiments on the phase evolution, structure, and properties of the MoNx thin films. The results showed that the retained Mo metal phase played an important role in hardness, electrical resistivity, and residual stress.
SURFACE TOPOGRAPHY-METROLOGY AND PROPERTIES
(2023)
Article
Materials Science, Coatings & Films
Yiqun Feng, Tsai-Fu Chung, Chien-Nan Hsiao, Jia-Hong Huang
Summary: This study investigated the effects of duty cycle and nitrogen flow rate on the microstructure and mechanical properties of (V,Mo)N coatings deposited by high-power pulsed magnetron sputtering (HPPMS). The results showed that the N/metal ratio and lattice parameter were affected by the nitrogen flow rate, while the deposition time influenced the preferred orientation of the coatings. Moreover, the (V,Mo)N coatings deposited by HPPMS exhibited higher hardness and fracture toughness compared to those deposited by dc-unbalanced magnetron sputtering (dc-UBMS).
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)