Article
Chemistry, Multidisciplinary
Charles Otieno Ogolla, Yannik Loth, Tobias Haeger, Cedric Kreusel, Manuel Runkel, Thomas Riedl, Benjamin Butz, Anna Katharina Wigger, Stephan Schaeffer, Peter Haring Bolivar
Summary: In this study, THz-sSNOM was used for nanoscale imaging of CsPbBr3 thin films, and the local THz nanoscale conductivity was derived using a scattering model. The analysis of the obtained signals confirmed the presence of halide vacancies (VBr) and Pb-Pb bonds at the CsPbBr3 grain boundaries, which resulted in charge carrier trapping and nonradiative recombination. This study establishes THz-sSNOM as a powerful analysis platform for thin-film semiconductors like LHPs.
Article
Optics
K. H. Tan, L. Samylingam, Navid Aslfattahi, R. Saidur, K. Kadirgama
Summary: The combination of MXenes with PVA to form nanocomposites thin film using drop-casting technique resulted in increased electrical conductivity of PVA and enhanced optical absorption characteristics, with potential applications in optoelectronics, conductive filler, and electromagnetic absorbers.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Wenhui Lu, Jie Jian, Jianguo Chen, Jinrong Cheng
Summary: Ferroelectric films of BFM-PT were successfully fabricated on LNO-coated stainless steel substrates with different thicknesses using a sol-gel process. The films exhibited single perovskite structure, smooth surface, increased polarization and dielectric constant with thickness, and changed conduction mechanism with thickness increase, maintaining excellent dielectric and ferroelectric properties.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Akhya Kumar Behera, Ramkumar Chandran, Sanjeev Das, Archana Mallik
Summary: FLGN and rFLGN were used as reinforcement in copper matrix to produce nanocomposite thin film on Cu substrates via sonoelctrodeposition method. The composite films showed improved wear properties, attributed to uniform distribution of graphene in metal matrix and increased hardness, with wear mechanisms being abrasive or adhesive types. Cu-rFLGN composites exhibited adhesive wear leading to delamination of Cu layers.
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
(2021)
Article
Materials Science, Multidisciplinary
Altangerel Dulmaa, Florian G. Cougnon, Robin Dedoncker, Diederik Depla
Summary: The meta-analysis shows the relationship between grain size and film thickness follows a power law, with growth exponent depending on homologous temperature. Above a certain temperature, restructuring mechanisms affect grain size during film growth. Difference in growth exponent behaviors is observed for Al and Cu thin films under the influence of impurities.
Article
Nanoscience & Nanotechnology
Hanna Bishara, Lena Langenohl, Xuyang Zhou, Baptiste Gault, James P. Best, Gerhard Dehm
Summary: The study focuses on the effect of Fe-alloying on the resistivities of grains and grain boundaries in Cu thin films. Cu films with varying grain sizes and Fe compositions were prepared. The properties, morphology, and compositions of bulk and grain boundaries were analyzed using different methods. Both local electrical measurements and global resistivity characterization were performed to obtain specific resistivities and calculate the grain boundary reflection coefficient. It was found that alloying significantly increased the resistivity of grain boundaries while causing only minor influence on the grain interior.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Multidisciplinary
Laura Frey, Jonas Fredrik Poehls, Matthias Hennemann, Andre Maehringer, Stephan Reuter, Timothy Clark, Ralf Thomas Weitz, Dana Dina Medina
Summary: In this study, covalent organic frameworks (COFs) based on a novel thiophene-extended benzotrithiophene (BTT) building block were successfully synthesized, showing high surface areas and in-plane electrical conductivity. The charge transport mechanism and directionality were investigated using techniques such as electrical conductivity measurements and conductive atomic force microscopy.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Yifan Wang, Luyao Wang, Yu Chen, Xiangchen Hu, Yi Yu, Nan Yang
Summary: Yttrium-doped barium zirconate (BZY) is a promising electrolyte for intermediate-to-low temperature protonic ceramic fuel cells. However, the transport properties of BZY are often hindered by resistive space charge zones at lattice discontinuities. In this study, surface defect engineering using Ar and/or O2 plasma was found to improve the proton conductivities and lower the activation energy of BZY thin films by creating negatively charged barium vacancy defects and enriching yttrium dopants on the surface.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Xianwu Tang, Ling Hu, Xiaoguang Zhu, Xuebin Zhu, Yongjin Wang, Yuping Sun
Summary: Rare-earth nickelates-based high-entropy oxide thin films were successfully deposited on different oriented LaAlO3 substrates via chemical solution deposition. The films exhibited epitaxial grain growth and a first-order metal-to-insulator transition. Particularly, the (110)-oriented films showed a well-defined transition temperature and high sharpness.
CRYSTAL GROWTH & DESIGN
(2022)
Article
Chemistry, Multidisciplinary
Mei Li, Meijie Xiao, Qunhao Wang, Jian Zhang, Xiaolin Xue, Jiangqi Zhao, Wei Zhang, Canhui Lu
Summary: In this study, a cellulose nanofibrils (CNFs)/few-layer graphene (FLG) hybrid was obtained from bamboo pulp and expanded graphene using a grinder, and used as a filler in a polyoxyethylene (PEO) matrix. The resulting nanocomposite film exhibited significantly improved mechanical and electrical properties, making it a promising candidate for future electronic devices.
Article
Materials Science, Coatings & Films
Yifei Li, Kate Reidy, Aubrey Penn, Seng Huat Lee, Baoming Wang, Kevin Ye, Zhiqiang Mao, Frances M. Ross, R. Jaramillo
Summary: We report a scalable two-step method for synthesizing large-area, high-Ti-content Mo1-xTixS2 alloy thin films in the 2H phase at temperatures as low as 500 degrees C. Higher temperature processing accelerates Ti segregation, film coarsening, and the formation of TiS2 in the 1T phase. Crystal growth at higher temperature results in the formation of multiple binary sulfide phases, in agreement with the equilibrium phase diagram. Therefore, developing low-temperature processing is crucial for obtaining highly metastable, smooth, and uniform single-phase alloy films. Our research is significant for the development of technologies based on designer transition metal dichalcogenide alloys, including photonic integrated circuits and gas sensing.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2023)
Article
Chemistry, Multidisciplinary
Elida I. de Obaldia, Jesus J. Alcantar-Pena, Frederick P. Wittel, Jean Francois Veyan, Salvador Gallardo-Hernadez, Yury Koudriavtsev, Dainet Berman-Mendoza, Orlando Auciello
Summary: This paper investigates the effect of hydrogen atom insertion into the grain boundaries of polycrystalline diamond films, focusing on the H atom concentration and its impact on the properties. The study suggests a simple model where two dangling bonds per unit cell of C atoms serve as the site of hydrogen incorporation. The experiment results show that the concentration of H atoms at the grain boundaries is consistent regardless of grain size. Conductive atomic force microscopy and ultraviolet photoelectron spectroscopy techniques were used to observe the electrical behavior and metallic properties of the films.
APPLIED SCIENCES-BASEL
(2021)
Article
Physics, Applied
Min-Hee Hong, Haryeong Choi, Younghun Kim, Dong Il Shim, Hyung Hee Cho, Hyung-Ho Park
Summary: This study explored the effects of thermoelectric properties on mesoporous thin film ZnO through doping with various group III elements. The differences in ionic radii between Zn and doping elements induced a distorted structure, reducing mobility and crystallinity. Ga was identified as the most effective doping element for achieving higher power factors in ZnO thin films by controlling dopant concentration and inducing lattice deformation.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
R. C. Ramola, Sandhya Negi, Mukesh Rawat, R. C. Singh, Fouran Singh
Summary: Zinc oxide (ZnO) is a versatile material with high thermal conductivity, electron mobility, wide band gap, and exciton binding energy, making it suitable for various device applications. Among these applications, gallium-doped ZnO thin films annealed at 700 degrees Celsius show the highest sensitivity and shortest response and recovery time for ethanol and acetone gases, demonstrating the potential for gas sensing applications.
Article
Polymer Science
Aleksandr S. Buinov, Elvira R. Gafarova, Ekaterina A. Grebenik, Kseniia N. Bardakova, Bato Ch Kholkhoev, Nadezhda N. Veryasova, Pavel Nikitin, Nastasia Kosheleva, Boris S. Shavkuta, Anastasia S. Kuryanova, Vitalii F. Burdukovskii, Peter S. Timashev
Summary: Chitosan/graphene nanocomposite films with tunable properties were successfully synthesized for conductive tissue engineering. The films exhibited comparable electrical conductivity, mechanical properties, and biocompatibility to smooth muscle tissue, without releasing soluble cytotoxic components.
Article
Chemistry, Physical
D. Stender, R. Frison, K. Conder, J. L. M. Rupp, B. Scherrer, J. M. Martynczuk, L. J. Gauckler, C. W. Schneider, T. Lippert, A. Wokaun
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2015)
Article
Materials Science, Multidisciplinary
Henning Galinski, Thomas Ryll, Philipp Reibisch, Lukas Schlagenhauf, Iwan Schenker, Ludwig J. Gauckler
Article
Chemistry, Multidisciplinary
Barbara Scherrer, Meike V. F. Schlupp, Dieter Stender, Julia Martynczuk, Jan G. Grolig, Huan Ma, Peter Kocher, Thomas Lippert, Michel Prestat, Ludwig J. Gauckler
ADVANCED FUNCTIONAL MATERIALS
(2013)
Article
Chemistry, Physical
P. N. Sturzenegger, U. T. Gonzenbach, S. Koltzenburg, J. Martynczuk, L. J. Gauckler
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2014)
Article
Astronomy & Astrophysics
Henning Galinski, Thomas Ryll, Lukas Schlagenhauf, Iwan Schenker, Ralph Spolenak, Ludwig J. Gauckler
COMPTES RENDUS PHYSIQUE
(2013)
Article
Electrochemistry
R. Toelke, L. J. Gauckler, U. Kunz, A. Krauss, M. Prestat
Article
Electrochemistry
M. V. F. Schlupp, A. Kurlov, J. Hwang, Z. Yang, M. Doebeli, J. Martynczuk, M. Prestat, J. -W. Son, L. J. Gauckler
Article
Electrochemistry
A. Evans, C. Benel, A. J. Darbandi, H. Hahn, J. Martynczuk, L. J. Gauckler, M. Prestat
Article
Chemistry, Physical
Barbara Scherrer, Anna Evans, Alejandro J. Santis-Alvarez, Bo Jiang, Julia Martynczuk, Henning Galinski, Majid Nabavi, Michel Prestat, Rene Toelke, Anja Bieberle-Huetter, Dimos Poulikakos, Paul Muralt, Philippe Niedermann, Alex Dommann, Thomas Maeder, Peter Heeb, Valentin Straessle, Claude Muller, Ludwig J. Gauckler
JOURNAL OF POWER SOURCES
(2014)
Article
Chemistry, Multidisciplinary
Sasa Zeljkovic, Toni Ivas, Sebastien Vaucher, Dijana Jelic, Ludwig J. Gauckler
JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
(2014)
Article
Materials Science, Multidisciplinary
A. Botea-Petcu, S. Tanasescu, V. Varazashvili, N. Lejava, T. Machaladze, M. Khundadze, F. Maxim, F. Teodorescu, J. Martynczuk, Z. Yang, L. J. Gauclder
MATERIALS RESEARCH BULLETIN
(2014)
Article
Chemistry, Physical
R. Frison, S. Heiroth, J. L. M. Rupp, K. Conder, E. J. Barthazy, E. Mueller, M. Horisberger, M. Doebeli, L. J. Gauckler
SOLID STATE IONICS
(2013)
Article
Electrochemistry
Sasa Zeljkovic, Toni Ivas, Anna Infortuna, Ludwig J. Gauckler
JOURNAL OF NEW MATERIALS FOR ELECTROCHEMICAL SYSTEMS
(2014)
Article
Physics, Applied
Henning Galinski, Thomas Ryll, Yang Lin, Barbara Scherrer, Anna Evans, Ludwig J. Gauckler, Max Doebeli
PHYSICAL REVIEW APPLIED
(2014)
Article
Materials Science, Ceramics
F. Knies, K. Schrantz, C. Aneziris, L. Gauckler, T. Graule
JOURNAL OF CERAMIC SCIENCE AND TECHNOLOGY
(2016)
Article
Materials Science, Multidisciplinary
Y. Liu, K. Zweiacker, C. Liu, J. T. McKeown, J. M. K. Wiezorek
Summary: The evolution of rapid solidification microstructure and solidification interface velocity of hypereutectic Al-20at.%Cu alloy after laser melting has been studied experimentally. It was found that the formation of microstructure was dominated by eutectic, alpha-cell, and banded morphology grains, and the growth modes changed with increasing interface velocity.
Article
Materials Science, Multidisciplinary
Bharat Gwalani, Julian Escobar, Miao Song, Jonova Thomas, Joshua Silverstein, Andrew Chihpin Chuang, Dileep Singh, Michael P. Brady, Yukinori Yamamoto, Thomas R. Watkins, Arun Devaraj
Summary: Castable alumina forming austenitic alloys exhibit superior creep life and oxidation resistance at high temperatures. This study reveals the mechanism behind the enhanced creep performance of these alloys by suppressing primary carbide formation and offers a promising alloy design strategy for high-temperature applications.
Article
Materials Science, Multidisciplinary
Jian Song, Qi Zhang, Songsong Yao, Kunming Yang, Houyu Ma, Jiamiao Ni, Boan Zhong, Yue Liu, Jian Wang, Tongxiang Fan
Summary: Recent studies have shown that achieving an atomically flat surface for metals can greatly improve their oxidation resistance and enhance their electronic-optical applications. Researchers have explored the use of graphene as a covering layer to achieve atomically flat surfaces. They found that high-temperature deposited graphene on copper surfaces formed mono-atomic steps, while annealed copper and transferred graphene on copper interfaces formed multi-atomic steps.
Article
Materials Science, Multidisciplinary
Jennifer A. Glerum, Jon-Erik Mogonye, David C. Dunand
Summary: Elemental powders of Al, Ti, Sc, and Zr are blended and processed via laser powder-bed fusion to create binary and ternary alloys. The microstructural analysis and mechanical testing show that the addition of Ti results in the formation of primary precipitates, while the addition of Sc and Zr leads to the formation of fine grain bands. The Al-0.25Ti-0.25Zr alloy exhibits comparable strain rates to Al-0.5Zr at low stresses, but significantly higher strain rates at higher stresses during compressive creep testing. Finite element modeling suggests that the connectivity of coarse and fine grain regions is a critical factor affecting the creep resistance of the alloys.
Article
Materials Science, Multidisciplinary
P. Jannotti, B. C. Hornbuckle, J. T. Lloyd, N. Lorenzo, M. Aniska, T. L. Luckenbaugh, A. J. Roberts, A. Giri, K. A. Darling
Summary: This work characterizes the thermo-mechanical behavior of bulk nanocrystalline Cu-Ta alloys under extreme conditions. The experiments reveal that the alloys exhibit unique mechanical properties, behaving differently from conventional nanocrystalline Cu. They do not undergo grain coarsening during extrusion and exhibit behavior similar to coarse-grained Cu.
Article
Materials Science, Multidisciplinary
Yiqing Wei, Jingwei Li, Daliang Zhang, Bin Zhang, Zizhen Zhou, Guang Han, Guoyu Wang, Carmelo Prestipino, Pierric Lemoine, Emmanuel Guilmeau, Xu Lu, Xiaoyuan Zhou
Summary: This study proposes a new strategy to modify microstructure by phase regulation, which can simultaneously enhance carrier mobility and reduce lattice thermal conductivity. The addition of Cu in layered SnSe2 induces a phase transition that leads to increased grain size and reduced stacking fault density, resulting in improved carrier mobility and lower lattice thermal conductivity.
Article
Materials Science, Multidisciplinary
Jia Chen, Zhengyu Zhang, Eitan Hershkovitz, Jonathan Poplawsky, Raja Shekar Bhupal Dandu, Chang-Yu Hung, Wenbo Wang, Yi Yao, Lin Li, Hongliang Xin, Honggyu Kim, Wenjun Cai
Summary: In this study, the structural origin of the pH-dependent repassivation mechanisms in multi-principal element alloys (MPEA) was investigated using surface characterization and computational simulations. It was found that selective oxidation in acidic to neutral solutions leads to enhanced nickel enrichment on the surface, resulting in reduced repassivation capability and corrosion resistance.
Article
Materials Science, Multidisciplinary
X. Y. Xu, C. P. Huang, H. Y. Wang, Y. Z. Li, M. X. Huang
Summary: The limited slip systems of magnesium (Mg) and its alloys hinder their wide applications. By conducting tensile straining experiments, researchers discovered a rate-dependent transition in the dislocation mechanisms of Mg alloys. At high strain rates, glissile dislocations dominate, while easy-glide dislocations dominate at low strain rates. Abundant glissile dislocations do not necessarily improve ductility.
Article
Materials Science, Multidisciplinary
M. S. Szczerba, M. J. Szczerba
Summary: Inverse temperature dependences of the detwinning stress were observed in face-centered cubic deformation twins in Cu-8at.%Al alloy. The detwinning stress increased with temperature when the pi detwinning mode was involved, but decreased when the pi/3 mode was involved. The dual effect of temperature on the detwinning stress was due to the reduction of internal stresses pre-existing within the deformation twins. The complete reduction of internal stresses at about 530 degrees C led to the equivalence of the critical stresses of different detwinning modes and a decrease in the yield stress anisotropy of the twin/matrix structure.
Article
Materials Science, Multidisciplinary
Taowen Dong, Tingting Qin, Wei Zhang, Yaowen Zhang, Zhuoran Feng, Yuxiang Gao, Zhongyu Pan, Zixiang Xia, Yan Wang, Chunming Yang, Peng Wang, Weitao Zheng
Summary: The interaction between the electrode and the electric double layer (EDL) significantly influences the energy storage mechanism. By studying the popular alpha-Fe2O3 electrode and the EDL interaction, we find that the energy storage mechanism of the electrode can be controlled by modulating the EDL.
Article
Materials Science, Multidisciplinary
Matthew R. Barnett, Jun Wang, Sitarama R. Kada, Alban de Vaucorbeil, Andrew Stevenson, Marc Fivel, Peter A. Lynch
Summary: The elastic-plastic transition in magnesium alloy Mg-4.5Zn exhibits bursts of deformation, which are characterized by sudden changes in grain orientation. These bursts occur in a coordinated manner among nearby grains, with the highest burst rate observed at the onset of full plasticity. The most significant burst events are associated with twinning, supported by the observation of twinned structures using electron microscopy. The bursts are often preceded and followed by a stasis in peak movement, indicating a certain "birth size" for twins upon formation and subsequent growth at a later stage.
Article
Materials Science, Multidisciplinary
Vaidehi Menon, Sambit Das, Vikram Gavini, Liang Qi
Summary: Understanding solute segregation thermodynamics is crucial for investigating grain boundary properties. The spectral approach and thermodynamic integration methods can be used to predict solute segregation behavior at grain boundaries and compare with experimental observations, thus aiding in alloy design and performance control.
Article
Materials Science, Multidisciplinary
Feiyu Qin, Lei Hu, Yingcai Zhu, Yuki Sakai, Shogo Kawaguchi, Akihiko Machida, Tetsu Watanuki, Yue-Wen Fang, Jun Sun, Xiangdong Ding, Masaki Azuma
Summary: This study reports on the negative and zero thermal expansion properties of Cd2Re2O7 and Cd1.95Ni0.05Re2O7 materials, along with their ultra-low thermal conductivity. Through investigations of their structures and phonon calculations, the synergistic effect of local structure distortion and soft phonons is revealed as the key to achieving these distinctive properties.
Article
Materials Science, Multidisciplinary
Thomas Beerli, Christian C. Roth, Dirk Mohr
Summary: A novel testing system for miniature specimens is designed to characterize the plastic response of materials for which conventional full-size specimens cannot be extracted. The system has an automated operation process, which reduces the damage to specimens caused by manual handling and improves the stability of the test results. The experiments show that the miniature specimens extracted from stainless steel and aluminum have high reproducibility, and the results are consistent with those of conventional-sized specimens. A correction procedure is provided to consider the influence of surface roughness and heat-affected zone caused by wire EDM.
Article
Materials Science, Multidisciplinary
Rani Mary Joy, Paulius Pobedinskas, Nina Baule, Shengyuan Bai, Daen Jannis, Nicolas Gauquelin, Marie-Amandine Pinault-Thaury, Francois Jomard, Kamatchi Jothiramalingam Sankaran, Rozita Rouzbahani, Fernando Lloret, Derese Desta, Jan D'Haen, Johan Verbeeck, Michael Frank Becker, Ken Haenen
Summary: This study investigates the influence of film microstructure and composition on the Young's modulus and residual stress in nanocrystalline diamond thin films. The results provide insights into the mechanical properties and intrinsic stress sources of these films, and demonstrate the potential for producing high-quality nanocrystalline diamond films under certain conditions.