Article
Chemistry, Multidisciplinary
Nicholas Schaper, Dheyaa Alameri, Yoosuk Kim, Brian Thomas, Keith McCormack, Mathew Chan, Ralu Divan, David J. Gosztola, Yuzi Liu, Irma Kuljanishvili
Summary: A novel approach of growing zinc oxide nanowires directly on single-walled carbon nanotubes and graphene surfaces has been demonstrated through the successful formation of heterostructure interfaces, showing the ability to control materials' placement and morphology.
Article
Engineering, Chemical
Shin Horiuchi, Yida Liu, Yuri Shigemoto, Takeshi Hanada, Kazumasa Shimamoto
Summary: In this study, the nano-scale failure behaviors of joint interfaces were investigated using in-situ straining technique and transmission electron microscopy. The results showed that before the initiation of crack, the crack tip underwent deformation and a craze zone appeared in the polymer interface. Additionally, the failure of interfaces between aluminum alloy and adhesive, and between aluminum alloy and thermoplastic were explored to understand the small scale failure behaviors prior to macroscopic fracture.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2022)
Article
Electrochemistry
Markus Felten, Siyuan Zhang, Rasa Changizi, Christina Scheu, Mark Bruns, Michael Strebl, Sannakaisa Virtanen, Daniela Zander
Summary: The corrosion rate of magnesium is influenced by the stability of its surface layer. The oxide structure on the magnesium substrate consists of a dense MgO/Mg(OH)2 mixture beneath a porous plate-like Mg(OH)2 layer. Recent studies have revealed that the thickness of the Mg(OH)2 layer affects the kinetics of the cathodic partial reaction. Thinner Mg(OH)2 layer is associated with higher kinetics of the oxygen reduction reaction. In this study, the mechanism was further investigated through in situ respirometric measurements using Mg-Al-Ca solid solution in electrolytes with different pH values (pH = 8.0-13.0). The results indicate an additional effect of the surface layer structure on Mg-Al-Ca alloys in the passive state. Furthermore, two different Al-enriched interfaces were observed and discussed in terms of their thermodynamic stability under alkaline immersion conditions.
ELECTROCHEMISTRY COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Ankush G. Thate, Keshav S. Pakhare, Satish S. Patil, Vijaykumar M. Bhuse
Summary: In this study, a TiO2-ZnO nanocomposite was developed for dye-sensitized solar cells using chemical bath deposition. Different compositions of TiO2-ZnO were studied and observed to have nanocrystalline structures. The composite material showed a suitable band gap energy and improved photocurrent and photovoltage. The 3:1 ratio of TiO2-ZnO exhibited the highest photo-conversion efficiency.
RESEARCH ON CHEMICAL INTERMEDIATES
(2023)
Article
Chemistry, Multidisciplinary
Min Wang, Wenhao Sun, Kun Zhang, Zhonghua Zhang, Aobing Du, Shanmu Dong, Jinlei Zhang, Jing Liu, Xi Chen, Zhenfang Zhou, Fujun Li, Zhenjiang Li, Guicun Li, Guanglei Cui
Summary: This study reports the synergy between the coordination and trace ionization of amine/ether co-solvents to enable a reversible magnesium (Mg)-metal anode for low cost rechargeable Mg batteries. By regulating the coordination/ionization processes of co-solvents, better Mg plating/stripping reversibility and prolonged cycle life are achieved.
ENERGY & ENVIRONMENTAL SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Ramasis Goswami, Alex Moser, Chandra S. Pande
Summary: This study reports the non-recrystallization behavior of a cold-worked Cu-Al2O3 composite at elevated temperatures. The composite, fabricated through internal oxidation, exhibits fine Al2O3 particles and a high density of Cu2O particles, which effectively inhibits grain boundary migration and recrystallization process.
Article
Chemistry, Physical
M. Stachowicz, A. Wierzbicka, J. M. Sajkowski, M. A. Pietrzyk, P. Dluzewski, E. Dynowska, J. Dyczewski, K. Morawiec, S. B. Kryvyi, S. Magalhaes, E. Alves, A. Kozanecki
Summary: This study analyzed heteroepitaxially grown ZnO/MgO superlattices on a-oriented ZnO substrates. It found that the different crystalline structures of ZnO and MgO influence the abruptness of the interface and the retention of the wurtzite structure. The wurtzite structure can be retained in the MgO thin barriers, but it inevitably leads to non-uniform biaxial strains and interdiffusion of Mg from barriers to ZnO QW's. The complex strain/composition heterogeneities can be explained by the difference in vapor pressure between Mg and Zn elements and the high mobility of Mg atoms. A ZnMgO film of three monolayers size was created at the interfaces, which partly contributes to retaining the wurtzite structure of the coherently grown MgO layers.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Jong Chan Yoon, Zonghoon Lee, Gyeong Hee Ryu
Summary: The study reports the structural merging behavior and atomic arrangement of zinc oxide nanosheets transferred onto monolayer graphene, providing insights into atomic alignments and rearrangements when transitioning into a graphene-like layered structure.
Article
Materials Science, Multidisciplinary
Meng Li, Zhang-Zhi Shi
Summary: This study investigated the morphology of nano-scale ZnO corrosion products and their orientation relationship with Zn matrix using TEM. A small volumetric strain of 0.63% was determined to achieve a low energy interfacial structure between the two phases. The method for quickly finding low energy interface under TEM by satisfying multiple Delta g//g in reciprocal space was proposed.
MATERIALS CHARACTERIZATION
(2021)
Article
Materials Science, Multidisciplinary
B. C. Hornbuckle, S. A. Turnage, C. L. Williams, A. K. Giri, D. Casem, K. Solanki, K. A. Darling
Summary: This study investigates the Hugoniot elastic limit and spall strength of a nanocrystalline copper-tantalum alloy, showing significant improvements compared to polycrystalline copper. Advanced microstructural characterization reveals the unprecedented ability of stable nanocrystalline alloys to resist high defect accumulation and damage.
Article
Materials Science, Multidisciplinary
Junkai Liu, Zhe Hao, Zhexin Cui, Dayan Ma, Junqiang Lu, Yanguang Cui, Chong Li, Wenbo Liu, Shijing Xie, Pengfei Hu, Ping Huang, Guanghai Bai, Di Yun
Summary: The study found that the CrN coating significantly enhances the oxidation resistance of Zircaloy in high-temperature steam by forming a dense oxide layer, reducing cracking and spalling. Two different multi-layered coatings were formed after oxidation, and internal oxidation of Zr particles within the nitride coating was observed.
Article
Nanoscience & Nanotechnology
Lunchao Zhang, Yuan Yuan, Jun Wang, Tao Chen, Jingfeng Wang, Fusheng Pan
Summary: High temperature heat treatment Mg-0.69Sn-0.69Y alloy exhibited a high damping capacity (0.201 at epsilon=1 x 10-3) and a very low critical strain amplitude at room temperature (epsilon cr1=2.97 x 10-5), which can be ascribed to the combined effects of purified matrix phase and subgrain interfaces. The substructure is unstable and the damping capacity decreases with temperature increment.
SCRIPTA MATERIALIA
(2023)
Article
Electrochemistry
So-Yoon Park, Hyun-Woo Cha, Jae-Woo Joung, Cheol-Woong Yang
Summary: This analytical method utilizes TEM to quickly detect and measure nano-scale defects, making it practical for the fabrication of printed circuit boards.
JOURNAL OF THE ELECTROCHEMICAL SOCIETY
(2021)
Article
Materials Science, Ceramics
Temesgen D. Desissa
Summary: The study investigated the interface properties of oxide materials at high temperatures, revealing the electrical, chemical, and thermal stabilities of the contact materials between 500-1000 degrees Celsius. Annealing at elevated temperatures maintained the chemical stability of the interfaces, with longer annealing times resulting in increased reverse current output attributed to increased contact area and cation inter-diffusion.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Bijun Xie, Qianning Dai, Zhenxiang Yu, Chunyang Wang, Bin Xu, Mingyue Sun, Dianzhong Li
Summary: The laminated bonding interfaces of Ti6Al3Nb2Zr1Mo (Ti-6321) and Ti6Al4V (TC4) form an interfacial transition zone during plastic deformation bonding, inducing the formation of fine grains at the interface. Element partitioning also occurs across the bonding interface.
Article
Materials Science, Multidisciplinary
Namgue Lee, Hyeongtag Jeon
Summary: Tin disulfide (SnS2) is a promising two-dimensional post-transition metal chalcogenide material with potential for competition with benchmarked 2D-TMDC materials. Synthesized at low temperature, SnS2 has lower thermal stability at high temperatures. However, the presence of an Al2O3 passivation layer can enhance thermal stability and improve crystallinity during post-annealing of SnS2 thin films.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2021)
Article
Optics
Hyeongsu Choi, Namgue Lee, Hyunwoo Park, Yeonsik Choi, Hyunwoo Yuk, Junghoon Lee, Sung Gwon Lee, Eun Jong Lee, Hyeongtag Jeon
Summary: The electronic band structure of Zn(O,S) films was investigated by depositing films with different ZnO/ZnS cycle ratios to achieve an ideal flat CBO matching with the SnS absorber layer.
Article
Materials Science, Multidisciplinary
Chanwon Jung, Seokhwi Song, Namgue Lee, Youngjoon Kim, Eun Jong Lee, Sung Gwon Lee, Hyeongtag Jeon
Summary: Utilizing BTBAS precursor and O-2 plasma for RPALD, high-quality SiO2 thin films deposited at low temperatures exhibit a low leakage current density and high breakdown voltage, with a dielectric constant slightly lower than typical SiO2.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Byunguk Kim, Taeseong Kang, Gucheol Lee, Hyeongtag Jeon
Summary: This paper investigates the changes in TiO2 thin films property after annealing under different conditions. The results show that annealing can reduce the concentration of oxygen vacancies in TiO2 thin films, thus improving the dielectric constant and reducing the leakage current.
Correction
Nanoscience & Nanotechnology
Byunguk Kim, Taeseong Kang, Gucheol Lee, Hyeong tag Jeon
Article
Nanoscience & Nanotechnology
Byunguk Kim, Yeonsik Choi, Dahyun Lee, Seonghak Cheon, Younghun Byun, Hyeongtag Jeon
Summary: By utilizing a SnO2 seed layer and low temperature heat treatment, rutile-TiO2 films were successfully deposited at temperatures as low as 400 degrees Celsius. XPS, XRD, and TEM/EDX analyses confirmed key characteristics of the film deposition process. Additionally, the TiO2 film deposited on the SnO2 film exhibited a higher dielectric constant and leakage current was not affected.
Article
Materials Science, Multidisciplinary
Suhyeon Park, Taehun Park, Yeongtae Choi, Chanwon Jung, Byunguk Kim, Hyeongtag Jeon
Summary: The study investigated the use of remote plasma atomic layer deposition (RPALD) technology with a DC positive bias to improve the physical, chemical, and mechanical properties of SiO2 film. The results showed that the application of DC positive bias led to an increase in radical density and a decrease in sheath voltage, resulting in reduced hydrogen content, increased film density, improved elastic modulus and hardness, and suppressed surface roughness.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Byunguk Kim, Taeseong Kang, Seokhwi Song, Chanwon Jung, Jungho Lee, SeongHak Cheon, Hyeongtag Jeon
Summary: In this study, the properties of TiO2 thin films were evaluated after O-2 plasma treatment at various plasma powers. It was found that oxygen vacancies in the films decreased, the anatase structure became stronger, and the crystallinity improved. The leakage current density decreased significantly, and the dielectric constant increased.
Article
Materials Science, Multidisciplinary
Byunguk Kim, Hyunwoo Park, Sungkwon Lee, Dowwook Lee, Chanwon Jung, Hyeongtag Jeon
Summary: This paper investigates the changes in transfer characteristics of an Al-doped SnO2 thin film after annealing process. The annealing process reduces the oxygen vacancy concentration in the film, leading to improved channel characteristics and carrier concentration. At an annealing temperature of 500 degrees Celsius, the film achieves an on/off current ratio of 10(6) and a field effect mobility of 1.56 cm(2) Vs(-1).
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Multidisciplinary
Chanwon Jung, Seokhwi Song, Jisoo Kim, Suhyeon Park, Byunguk Kim, Kyunghoo Kim, Hyeongtag Jeon
Summary: The properties of SiNx thin films deposited via atomic layer deposition can be modified by using a hydrogen plasma treatment step, resulting in improved etch resistance and step coverage characteristics.
ECS JOURNAL OF SOLID STATE SCIENCE AND TECHNOLOGY
(2022)
Article
Materials Science, Coatings & Films
Byunguk Kim, Sangmin Lee, Taesung Kang, Sunghoon Kim, Sangman Koo, Hyeongtag Jeon
Summary: Pure MoNx thin films with excellent crystallinity and low impurity concentration can be obtained using a newly synthesized liquid Mo precursor in an ALD super-cycle process. These films exhibit relatively low resistivity values and excellent diffusion barrier characteristics, making them suitable for use as barrier layers at high temperatures.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Materials Science, Coatings & Films
Suhyeon Park, Junyung An, Hyeongtag Jeon
Summary: By studying Sn-doped SiO2 thin films, it was found that adjusting the SnO2 and SiO2 deposition cycle ratio can change the mechanical properties of the film, increasing the Young's modulus. However, the hardness results showed a tendency to fluctuate due to the unevenly distributed nanolaminate film structure.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Materials Science, Multidisciplinary
Seokhwi Song, Chanwon Jung, Jisoo Kim, Younsoo Kim, Hanjin Lim, Hyeongtag Jeon
Summary: This study investigates the deposition of ZrO2 using plasma-enhanced atomic layer deposition (PEALD) with a CpZr(NMe2)(3) precursor. The bonding and electrical properties of ZrO2 thin films are studied by varying the deposition temperature and plasma power. The results show that the deposition temperature and plasma power strongly influence the crystallinity of the films, and the highest dielectric constant is achieved at 50 W and 300 degrees C.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Nanoscience & Nanotechnology
Yeonsik Choi, Byunguk Kim, Dowwook Lee, Sooyeon Kang, Jungtae Kim, Jangho Bae, Hyeongtag Jeon
Summary: In this study, SnS2 thin films with different concentrations of zinc doping were successfully prepared using atomic layer deposition. As the doping concentration increased, the optical and electrical properties of the thin films exhibited significant changes, indicating their potential for optoelectronic applications.
ACS APPLIED NANO MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yeonsik Choi, Byunguk Kim, Dow-wook Lee, Hyeongtag Jeon
Summary: In this study, anion-mixed tin oxysulfide thin films were investigated as stable p-type semiconductor materials that can be deposited through atomic layer deposition (ALD). The films were synthesized through super-cycle repetition and analyzed using various techniques to examine their crystallinity, grain size, atomic composition, and electrical and optical properties. The analysis revealed a mixture of orthorhombic SnS and rutile SnO2 phases in the films, and the p-type characteristics were achieved by increasing the oxygen ratio. This work provides a promising approach to synthesize anion-mixed p-type semiconductors with good phase stability for various applications, including transistors, thin film transistors, photodetection, biochemical sensors, and photovoltaic energy devices.
