Article
Materials Science, Multidisciplinary
Yuchen Liu, Yu Zhou, Dechang Jia, Zhihua Yang, Daxin Li, Bin Liu
Summary: This study investigates the atomic structural features and mechanical properties of Si2BC3N using ab-initio calculations. It clarifies the chemical bonding types and their proportion, and identifies the tetrahedral and trigonal configurations and their nesting, which contribute to the flexibility of structural characteristics. The balance between tetrahedral and trigonal features through composition tailor is believed to be an effective way for the design of Si-B-C-N ceramics for structural applications.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Dominik Legut, Juergen Spitaler, Pasquale Pavone, Claudia Draxl
Summary: In this study, first-principles calculations were used to investigate the effect of carbon doping on the structural, electronic, and elastic behavior of gamma phase titanium aluminum alloys. The results indicate that carbon atoms prefer interstitial positions and have low solubility in stoichiometric alloys, but higher solubility in Ti-rich alloys. Below a concentration of 3 at.%, carbon has a minor effect on the ductile behavior of gamma-TiAl.
NEW JOURNAL OF PHYSICS
(2021)
Article
Physics, Applied
A. Amudhavalli, M. Santhosh, P. Dharmaraja, M. Manikandan, R. Rajeswara Palanichamy
Summary: The structural stability of YX 'CrZ (X '= Fe, Co, Ni; Z = Si, Ge, Sn) quaternary Heusler alloys was analyzed, predicting the lowest energy phase for each combination. The strong hybridization between 3d-Fe, 3d-Co, and 3d-Ni states leads to half metallicity in these alloys at normal pressure, which are all found to be ferromagnetic and mechanically stable.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2021)
Article
Chemistry, Physical
Xuefei Liu, Zhaofu Zhang, Zhao Ding, Bing Lv, Zijiang Luo, Jian-Sheng Wang, Zhibin Gao
Summary: A study using first principles method systematically predicted the anisotropic electronic and mechanical properties of 2D As2S3, showing a significantly higher Young's modulus ratio along two axes compared to black phosphorous. These findings provide valuable insights for the realization of flexible orientation-dependent nano-devices.
APPLIED SURFACE SCIENCE
(2021)
Article
Nanoscience & Nanotechnology
Yi-Nuo Zhang, Guang Yang, Chunyao Niu, Yu Jia, Jian-Tao Wang
Summary: In recent years, silicon surfaces covered with rare earth metals have attracted great interest due to their promising device applications. Here, we report a systematic study on the structural stability and electronic properties of Er nanowires on the Si(001) surface using ab initio calculations. Our results show that Er atomic chains with a double-core odd-membered-ring (5-7-5) structure on the Si(001) surface are among the most stable structures at lower coverage. Total energy calculations reveal that Er atoms prefer ferromagnetic coupling with a spin moment of 2.04-2.06 ?B on Er sites derived from the 4f electrons. Electronic band structure calculations demonstrate that the odd-membered-ring (5-7-5) structure exhibits a semiconductor feature with a small indirect band gap of 0.13 eV. This study provides new insights for further exploration of self-assembled nanowires of rare-earth metals on silicon surfaces.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Engineering, Electrical & Electronic
F. Djali, T. Ouahrani, S. Hiadsi, M. R. Boufatah
Summary: This study presents the first attempt to investigate the thermoelectric properties of FeZrTe half-Heusler alloy through theoretical calculations. The phonon dispersion and crystal structures are obtained using density functional theory and finite displacement method. The results show that FeZrTe alloy is mechanically and dynamically stable in its type I structure, and has a semiconducting character with a band gap of 1.4 eV. The variations of thermoelectric properties with carrier concentration and temperature have been studied, indicating the potential for constructing an n-p couple for a thermoelectric device.
JOURNAL OF ELECTRONIC MATERIALS
(2023)
Article
Green & Sustainable Science & Technology
Yiran Li, Mengling Lai, Minmin Hu, Shijun Zhao, Bin Liu, Ji-Jung Kai
Summary: This review summarizes the current understanding of the electronic and magnetic properties of two-dimensional (2D) transition metal carbides and/or nitrides (MXenes) from the perspectives of chemical compositions and structural configurations. The potential band-structure modifications and electronic applications of MXenes are emphasized. MXenes, as an important member of post-graphene 2D materials, are still under-explored but have shown promising electronic and magnetic properties.
SUSTAINABLE MATERIALS AND TECHNOLOGIES
(2022)
Article
Chemistry, Physical
V Jambur, C. Tangpatjaroen, J. Xi, J. Tarnsangpradit, M. Gao, H. Sheng, J. H. Perepezko, I Szlufarska
Summary: This study shows that minor alloying can enhance the strength of metallic glasses by increasing the chemical bond strength, which is distinct from changes in topological ordering. The addition of transition metals to Al-Sm based metallic glasses increased their hardness, mainly due to the strong bonding between transition metals and aluminum atoms. The effects of topology and chemistry on the mechanical properties of metallic glasses are independent of each other, providing insights for the design of metallic glasses with improved mechanical properties.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
A. Amudhavalli, R. Rajeswarapalanichamy, R. Padmavathy, M. Manikandan, M. Santhosh, K. Iyakutti
Summary: The electronic structure, elastic, optical, and thermal properties of chalcopyrite solar cell compounds were systematically studied, showing their potential as effective candidates for solar cell devices. The materials displayed direct band gap semiconducting behavior and were found to be dynamically stable, with calculated lattice constants in good agreement with existing data. Additionally, the energy band gap was observed to increase with gallium concentration, indicating the possibility of tuning the properties for specific applications.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Cihan Parlak
Summary: This study investigates the electronic and lattice properties of hexagonal SrGa2 binary system under external pressure using first-principles calculation methods. It examines fundamental quantities such as phonon dispersion curves, electronic band structures, Fermi surface topologies, and their relationship with the superconducting properties of SrGa2 material. Results show that information obtained directly from electronic band structures and Fermi surfaces is insufficient to explain the superconductivity phenomenon of these materials.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Computer Science, Interdisciplinary Applications
Nariman Abu el Kher, Israa Zeid, Nayla El-Kork, Mahmoud Korek
Summary: The electronic structure of alkaline-earth metal hydride cations SrH+ and BaH+ have been studied, with various spectroscopic parameters and rovibrational constants determined.
These substances play a crucial role in the absorption spectrum of the sun, making theoretical studies on them essential.
JOURNAL OF COMPUTATIONAL SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Piotr Ruszala, Maciej J. Winiarski, Malgorzata Samsel-Czekala
Summary: The electronic structures and microscopic electronic properties of novel La1_xTlxN rock-salt materials have been studied. La0.5Tl0.5N exhibits metallic character, while La0.75Tl0.25N is similar to LaSb and LaBi. Topologically non-trivial characteristics are expected in these nitride materials.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
E. M. Smelova, K. M. Tsysar, D. Galkin, V. I. Zverev, R. R. Gimaev
Summary: This study focuses on the magnetic properties of gold and manganese oxide nanowires. It was found that nanowires with different step edge geometries exhibit ferromagnetic and antiferromagnetic configurations. The study also reveals the influence of oxidation and surface geometry on the magnetic properties of the nanowires.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Hongtao Xue, Chao Lei, Fuling Tang, Xiuyan Li, Yaqiao Luo, Junqiang Ren, Xuefeng Lu
Summary: The study calculated the GB energies and works of separation for 12 Cu symmetrical tilt GBs using first-principles calculations, finding that they exhibit significant anisotropy and an inverted linear relationship between GB energies and works of separation.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Tijo Vazhappilly, Arup Kumar Pathak
Summary: This study investigates the effect of Ce atom substitution in UO2 on its thermophysical properties using density functional theory. The results show that the Ce substitution levels and the oxidation state of Ce/U atoms strongly influence the band structure and specific heat capacity of the UO2 lattice. These findings provide important insights into the fuel properties of UO2 under reactor conditions.
JOURNAL OF NUCLEAR MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Sooraj P. Sharma, Paul W. Leu
Summary: The study explored the impact of optimal tilt angle, orientation, and tracking method on the efficiency of solar modules, revealing that single-axis tracking in the east/west direction is more beneficial than north/south tracking, and continuous dual-axis tracking yields the highest energy collection improvement.
JOURNAL OF PHOTONICS FOR ENERGY
(2021)
Article
Nanoscience & Nanotechnology
Anthony J. Galante, Kathleen A. Yates, Eric G. Romanowski, Robert M. Q. Shanks, Paul W. Leu
Summary: This work demonstrates a coal-derived functionalized nano-graphene oxide coating applied to fabrics that exhibits antiviral properties even after mechanical abrasion or bleach washing.
ACS APPLIED NANO MATERIALS
(2022)
Article
Chemistry, Physical
Sajad Haghanifar, Anthony J. Galante, Mehdi Zarei, Jun Chen, Susheng Tan, Paul W. Leu
Summary: This study demonstrates a new type of 3D printed microcell/nanoparticle structures that exhibit high static contact angle, low contact angle hysteresis, and high mechanical durability. The use of interconnected microcell structures addresses mechanical durability issues, while low contact angle hysteresis is achieved by coating the structures with low surface energy nanoparticles.
Article
Nanoscience & Nanotechnology
Rongtao Cao, Ziyu Zhou, Sajad Haghanifar, Jingyu Wu, Ming-Jun Li, Susheng Tan, Paul W. Leu, Kevin P. Chen
Summary: This paper reports on the formation of moth-eye nanopillar structures on surfaces of alkali-aluminosilicate Gorilla glass substrates using a self-masking plasma etching method. The nanostructures enhance transmission at wavelengths over 525 nm and may have additional functionalities such as self-cleaning, anti-fogging, and stain-resistance.
Article
Optics
Sajad Haghanifar, Paul W. Leu
Summary: We conducted a detailed balance analysis on vertical GaAs nanowire arrays using rigorous coupled-wave analysis (RCWA). Both freestanding and arrayed nanowires on a perfect back reflector were evaluated. Both types of vertical nanowire arrays demonstrated efficiencies surpassing the Shockley Queisser (SQ) or radiative efficiency limit when the nanowires were long enough. The implementation of a back reflector enhanced the efficiency of nanowire solar cells by increasing solar absorption and suppressing emission from the backside of the solar cell. We studied the advantages of light trapping and material reduction in nanowires. Furthermore, we compared the simulations evaluating detailed balance efficiency with ultimate efficiency and showed that ultimate efficiency studies can determine near-optimal solar cells while significantly reducing the number of simulations needed. Although open circuit voltages above the radiative limit can be achieved, tradeoffs with short circuit current must be carefully considered. We also compared our simulation results to claims in the literature that nanowires are capable of exceeding the SQ limit.
Article
Chemistry, Multidisciplinary
Seongha Lee, Chan Ul Kim, Sumin Bae, Yulin Liu, Young Im Noh, Ziyu Zhou, Paul W. Leu, Kyoung Jin Choi, Jung-Kun Lee
Summary: The optical properties of a textured antireflective coating (ARC) polymeric film are engineered by combining the down-conversion effect of large phosphor particles and the multiple scattering effect of SiO2 nanoparticles, leading to an improved power conversion efficiency of perovskite/silicon tandem solar cells.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Optics
Mingxuan Li, Michael J. McCourt, Anthony J. Galante, Paul W. Leu
Summary: This study utilizes Bayesian optimization to find nanophotonic structures with high transmission and EMI shielding efficiency. By adjusting the high index dielectric layers and reducing the reflection losses, better performance can be achieved.
Article
Materials Science, Multidisciplinary
Anthony J. Galante, Brady C. Pilsbury, Mingxuan Li, Melbs LeMieux, Qihan Liu, Paul W. Leu
Summary: This study provides modeling and experiments on the mechanical failure of silver ink coatings on fabrics, and highlights the importance of strong adhesion between the metal film and microfiber for achieving high conductance thick films. The use of reactive silver ink and chemical etchant pretreatment enables good coverage and increased interface area, while the polymer provides additional protection during washing.
ACS APPLIED POLYMER MATERIALS
(2022)
Article
Multidisciplinary Sciences
Anthony J. Galante, Brady C. Pilsbury, Kathleen A. Yates, Melbs LeMieux, Daniel J. Bain, Robert M. Q. Shanks, Eric G. Romanowski, Paul W. Leu
Summary: This study demonstrates a fabric treatment method using reactive silver ink and low surface energy PDMS polymer, which provides superhydrophobicity and antiviral properties even after harsh disinfection procedures. The use of reactive silver ink shows better antiviral efficacy and durability compared to silver nanoparticles.
Article
Chemistry, Applied
Mingxuan Li, Mehdi Zarei, Anthony J. Galante, Brady Pilsbury, S. Brett Walker, Melbs LeMieux, Paul W. Leu
Summary: In this paper, a highly conductive, stretchable, and wash-durable fabric for electronic textile applications is demonstrated. The fabric shows excellent EMI shielding efficiency, high Joule heating performance, and strain sensing capabilities. The fabric is also resistant to stretching and washing, making it suitable for various wearable electronic devices and next-generation communications.
PROGRESS IN ORGANIC COATINGS
(2023)
Article
Optics
Mehdi Zarei, James c. Loy, Mingxuan Li, Ziyu Zhou, Sneh Sinha, Melbs Lemieux, S. brett Walker, Barry p. Rand, Paul w. Leu
Summary: Organic light-emitting diodes (OLEDs) have great potential for large-area applications, but their adoption is hindered by the high cost and insufficient performance of indium tin oxide (ITO) anodes. In this study, a silver mesh embedded in glass is introduced as an alternative anode material, enabling the production of large-area OLEDs. The high aspect ratio micromeshes embedded in glass provide the desired planar geometry for OLED layers. The phosphorescent green OLEDs achieve high current efficiency and slightly higher external quantum efficiency compared to standard ITO/glass samples, without impacting the viewing angle.
Correction
Materials Science, Multidisciplinary
Sajad Haghanifar, Ping Lu, Md Imrul Kayes, Susheng Tan, Ki-Joong Kim, Tongchuan Gao, Paul Ohodnicki, Paul W. Leu
Summary: The correction for the paper 'Self-cleaning, high transmission, near unity haze OTS/silica nanostructured glass' by Sajad Haghanifar et al. presents a modified approach for self-cleaning, highly transparent, and nearly haze-free OTS/silica nanostructured glass.
JOURNAL OF MATERIALS CHEMISTRY C
(2023)
Article
Engineering, Electrical & Electronic
Mingxuan Li, Sneh Sinha, Sima Hannani, S. Brett Walker, Melbs LeMieux, Paul W. Leu
Summary: This study demonstrates silver films on PET with low sheet resistance, high EMI shielding efficiency, and high Joule heating performance. The silver films are fabricated using a reactive particle free silver ink and enhanced adhesion with PUD. The flexible coated silver thin films on PET show potential applications in smart wearable devices, personal medical electronics, and next-generation communications.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Proceedings Paper
Green & Sustainable Science & Technology
Robert Flores, Haoyang He, Parikhit Sinha, Garvin Heath, Paul W. Leu, Julie M. Schoenung
Summary: The global solar panel waste is projected to reach 60-78 million tonnes by 2050. Although efforts have been made to recover materials from end-of-life solar panels, most secondary materials undergo downcycling. The costs and benefits of capturing these secondary materials for new solar panels are unknown. Upgrading inventories and integrating them with recycling processes can help evaluate the environmental benefits of material recycling. This study focuses on upgrading inventories for cadmium-telluride (CdTe) panels and demonstrates the potential reduction in environmental indicators through improved sourcing of primary materials.
REWAS 2022: DEVELOPING TOMORROW'S TECHNICAL CYCLES, VOL I
(2022)
Article
Engineering, Electrical & Electronic
Ziyu Zhou, S. Brett Walker, Melbs LeMieux, Paul W. Leu
Summary: This study presents the fabrication and characterization of flexible high-performance transparent conductive electrodes using particle-free reactive silver ink. The electrodes demonstrate high transparency, low sheet resistance, and excellent performance, with the ability to manufacture microgrids and scalability, close to the best transparent electrode properties, and superiority in conductivity and stability compared to conventional nanoparticle inks.
ACS APPLIED ELECTRONIC MATERIALS
(2021)