Article
Materials Science, Multidisciplinary
Liang Zhao, Jianguo Zhang, Yufan Fu, Junjie Zhang, Alexander Hartmaier, Tao Sun
Summary: The coupled thermal-mechanical properties of grain boundaries in polycrystalline 3C-SiC during diamond cutting at elevated temperatures were investigated using multi-scale simulations. The results showed that inter-granular fracture was suppressed, stacking fault formation was enhanced, healing ability of grain boundaries was increased, and ductile material removal was promoted at high temperatures.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Ceramics
Liang Zhao, Wangjie Hu, Qiang Zhang, Junjie Zhang, Jianguo Zhang, Tao Sun
Summary: The machinability of hard brittle polycrystalline ceramic is closely related to its internal microstructures and deformation behavior. The study reveals the mechanisms governing the brittle-to-ductile transition behavior of polycrystalline 3C-SiC in diamond cutting, including dislocation slip, amorphization-dominated ductile deformation, and grain boundaries-mediated brittle fracture. The competitive co-existence of various deformation modes determines the brittle-to-ductile transition behavior in grooving of polycrystalline 3C-SiC.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Liang Zhao, Jianguo Zhang, Junjie Zhang, Alexander Hartmaier, Tao Sun
Summary: This study reveals the ductile deformation mechanisms and microstructure evolution of 3C-SiC ceramic material during ultrasonic elliptical vibration-assisted diamond cutting. The formation of highly oriented high density stacking faults, along with suppressed amorphization and cracking, contributes to enhanced ductile material removal. Raman spectroscopy, transmission electron microscopy, and molecular dynamics simulations are used to elucidate the phase transformation and microstructure evolution mechanisms.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Housheng Liu, Naeem Ul Haq Tariq, Weichen Jing, Xinyu Cui, Mingqiang Tang, Tianying Xiong
Summary: In this study, a series of 3C-SiC coatings were prepared by MOCVD method using a precursor solution containing varying proportions of HMDSO and nhexane. The phase composition, bonding state, and microstructure of the coatings were studied, and the microstructure and mechanical properties of the optimal coating were characterized. The results showed that introducing hydrogen gas and increasing the HMDSO/nhexane ratio reduced the undesired graphite phase significantly in the 3C-SiC coating.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Multidisciplinary
M. Agati, S. Boninelli, C. Calabretta, F. Mancarella, M. Mauceri, D. Crippa, M. Albani, R. Bergamaschini, L. Miglio, F. La Via
Summary: This paper investigates the morphology and microstructural properties of thick [1 1 1]-oriented 3C-SiC films epitaxially grown on T-shaped Si micropillars. The study examines crystallographic defects in the film and analyzes the impact of crystal quality on potential applications in high-performance microelectronic devices.
MATERIALS & DESIGN
(2021)
Article
Materials Science, Multidisciplinary
Marwa Sebai, Ghada Bousselmi, Jean-Louis Lazzari, Mounir Kanzari
Summary: This paper investigates the effect of zinc content in Cu2Zn1-xFexSnS4 thin films. CZTS, CZ(0.5)F(0.5)TS, and CZTS thin films were grown on silicon substrates at room temperature and sulfidation was performed at 400 degrees C. X-ray diffraction analysis reveals a structural transition from stannite to kesterite with increasing zinc content. EDAX analysis confirms the elemental composition of the thin films and morphological patterns shed light on the grain size and thickness evolution. The highest conductivity is observed in CZTS films as determined by Hall effect measurements. Impedance spectroscopy shows improved conduction mechanism with increasing x-fraction, in line with the correlated barrier hopping model.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Crystallography
Xiaodong Li, Yang Yang, Xiaocui Wang, Peng Zhu, Fanming Qu, Zhiwei Wang, Fan Yang
Summary: This article presents a study on the weak antilocalization (WAL) effect in polycrystalline SnTe films deposited by magnetron sputtering. The results show that clean WAL signals can be obtained at low temperatures, with an increase in transport channels contributing to WAL and a change in the temperature dependence of phase coherence length. The findings provide insights into the quantum transport properties of SnTe.
Article
Chemistry, Multidisciplinary
Andreea Bianca Serban, Vladimir Lucian Ene, Doru Dinescu, Iulia Zai, Nikolay Djourelov, Bogdan Stefan Vasile, Victor Leca
Summary: Various aspects of the GaN/AlN/SiC heterostructure, such as growth relations, interface consistency, and elemental diffusion, were studied using HR-TEM, HR-XRD, and DBS. Comparisons with previous work on Si and Al2O3 substrates revealed higher crystal quality and dislocation densities for GaN grown on SiC. The effective positron diffusion length for the GaN layer was also found to be higher using DBS measurements.
Article
Chemistry, Multidisciplinary
Qien Xu, Zhengdan Rao, Yiting Yang, Bo Jin, Xiaotian He, Jiaxuan Lai, Tiantian He, Lin Yang, Limin Zhang, Yongqi Liang
Summary: A spray deposition procedure was developed for fabricating polycrystalline MAPbBr(3) thick films (20-100 μm), and highly efficient (>5.5% under AM1.5 sunlight) hole-transport-material free perovskite solar cells were successfully made using 40 μm thick MAPbBr(3) films.
CHEMICAL COMMUNICATIONS
(2022)
Article
Materials Science, Multidisciplinary
Shuai Liu, Xian Luo, Bin Huang, Yanqing Yang
Summary: This study investigates the microstructure and mechanical properties of W-core SiC filament and its growth behavior in the chemical vapor deposition (CVD) process. The results show that the growth of 3C-SiC grains is limited by surface reactions and the increase in supersaturation leads to morphological changes and improved mechanical properties. The study highlights the importance of gas-phase supersaturation in the preparation of metal matrix composites.
Article
Chemistry, Physical
Nanxing Wu, Dongliang Liu, Mengjuan Zhong, Qi Zheng, Changfu Fang, Yi Jiang
Summary: The grinding process of polycrystalline 3C-SiC materials under diamond abrasive particles was simulated using molecular dynamics method. It was found that the crystal atoms near the grain boundary have low structural stability and mainly undergo dislocation slip. The force is transferred to the grain through the grain boundary, protecting the grains. The shearing force plays a dominant role in the grinding process.
SOLID STATE IONICS
(2023)
Article
Materials Science, Multidisciplinary
C. Cirillo, M. Caputo, G. Divitini, J. W. A. Robinson, C. Attanasio
Summary: The properties of Nb0.18Re0.82 superconducting thin films deposited by direct current magnetron sputtering under different growth conditions were studied. The resulting films exhibited homogeneous polycrystalline structure with small grain sizes, indicating disordered superconductivity. The correlation between structural disorder and superconducting properties was examined, along with the potential of NbRe-based devices as Superconducting Nanowire Single Photon Detectors.
Article
Chemistry, Physical
Eric K. K. Abavare, Bright Kwakye-Awuah, Oswald A. Nunoo, Peter Amoako-Yirenkyire, G. Gebreyesus, Abu Yaya, Keshaw Singh
Summary: Total energy calculations were used to study the interface structures between SiC and Si, revealing that Si-Si interface is more favorable than Si-C interface. The electronic structure shows metallic character with electron transfer from SiC to Si.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Materials Science, Coatings & Films
Rustam R. Amashaev, Nariman M. -R. Alikhanov, Abubakar M. Ismailov, Ilmutdin M. Abdulagatov
Summary: Polyamide films were grown on Si(111) using a MLD process and then pyrolyzed to yield crystalline SiC thin films. The synthesized 3C-SiC films showed heteroepitaxial nature with respect to the Si(111) substrate, and the formation of single-crystal SiC films was confirmed by various analysis techniques. The pyrolysis temperature affected the formation of defects in the samples, and the highly conformal SiC films were demonstrated using Bosch-processed Si trenches.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Materials Science, Coatings & Films
Jorge Sanchez Espinoza, Fatma Trabelsi, Christophe Escape, Ludovic Charpentier, Marc Fivel, Elisabeth Blanquet, Frederic Mercier
Summary: Ti3SiC2-SiC multilayer film coatings were synthesized using the high temperature reactive chemical vapor deposition technique. The coatings exhibited good mechanical integrity and high temperature stability.
SURFACE & COATINGS TECHNOLOGY
(2022)
Article
Construction & Building Technology
Jiaqi Li, Guoqing Geng, Rupert Myers, Young-Sang Yu, David Shapiro, Carlo Carraro, Roya Maboudian, Paulo J. M. Monteiro
CEMENT AND CONCRETE RESEARCH
(2019)
Article
Materials Science, Ceramics
Ping Cheng, Steven DelaCruz, Dung-Sheng Tsai, Zhongtao Wang, Carlo Carraro, Roya Maboudian
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2019)
Article
Chemistry, Analytical
Qizhen Zhu, Shiyu Hu, Linqun Zhang, Ying Li, Carlo Carraro, Roya Maboudian, Wei Wei, Anran Liu, Yuanjian Zhang, Songqin Liu
SENSORS AND ACTUATORS B-CHEMICAL
(2020)
Article
Multidisciplinary Sciences
Arif Mustafazade, Milind Pandit, Chun Zhao, Guillermo Sobreviela, Zhijun Du, Philipp Steinmann, Xudong Zou, Roger T. Howe, Ashwin A. Seshia
SCIENTIFIC REPORTS
(2020)
Article
Chemistry, Physical
Chuan-Pei Lee, Bayu-Tri Murti, Po-Kang Yang, Francesca Rossi, Carlo Carraro, Roya Maboudian
Summary: A cobalt oxide-decorated silicon carbide nano-tree array electrode was synthesized for micro-supercapacitor applications, showing extremely hydrophilic surface characteristics for enhanced charge transfer at the electrode/aqueous electrolyte interface. The well-standing architecture provided a directional charge transport route along the length of SiC nanowires, leading to excellent areal capacitance and stability in cyclic voltammetry measurements for 2000 cycles at a high scan rate of 150 mV s(-1).
Article
Chemistry, Analytical
Peter E. Beshay, Ali M. Ibrahim, Stefanie S. Jeffrey, Roger T. Howe, Yasser H. Anis
Summary: This paper investigates the dynamics of single cells encapsulated in water-in-oil emulsions in a microchannel, proposing new label-free methods for rare cell detection based on biomechanical properties. The study found that the sheath flow rate has a significant effect on cell dynamics, doubling the cell orbiting speed and potentially doubling the extracted biomechanical information.
Article
Chemistry, Analytical
Ali M. Ibrahim, Jose I. Padovani, Roger T. Howe, Yasser H. Anis
Summary: This paper examines the parameters affecting droplet generation in a microfluidic system, develops a three-dimensional numerical model for simulation, and investigates the impact of different flow rates on droplet size.
Article
Nanoscience & Nanotechnology
Maha Yusuf, George K. Herring, Lars Thorben Neustock, Mohammad Asif Zaman, Usha Raghuram, Vijay K. Narasimhan, Charmaine Chia, Roger T. Howe
Summary: High-contrast alignment marks are essential for precise alignment in X-ray imaging systems. The use of nanostructured black silicon (n-BSi) and optimized deep reactive-ion etching (DRIE) process allows for the fabrication of absorptive areas with low reflectance and high contrast ratio. Systematic variation of polymer deposition time T leads to various nanostructures, ultimately improving the efficiency and precision of alignment marks.
ACS APPLIED NANO MATERIALS
(2021)
Article
Computer Science, Information Systems
Charmaine Chia, Matteo Sesia, Chi-Sing Ho, Stefanie S. Jeffrey, Jennifer Dionne, Emmanuel J. Candes, Roger T. Howe
Summary: Deep neural networks and other machine learning models are widely used for biomedical signal data analysis due to their ability to detect complex patterns and make accurate predictions. However, interpreting these models can be challenging. This paper proposes a logistic regression model with carefully selected features for fast Raman spectroscopy data, achieving comparable accuracy to neural networks while being simpler and more transparent. The analysis involves wavelet features with intuitive chemical interpretations and controlled variable selection using knockoffs. This approach is applicable to other types of signal data where interpretability is important.
IEEE JOURNAL OF BIOMEDICAL AND HEALTH INFORMATICS
(2022)
Article
Engineering, Electrical & Electronic
Mary Tang, Swaroop Kommera, Usha Raghuram, Michelle Rincon, Xiaoqing Xu, Jonathan Fan, Roger T. Howe
Summary: This is a graduate-level laboratory course structured as a master class in project planning and execution. Students work in teams on project topics of their choosing, ideally relevant to their own research areas, utilizing shared facilities. The aim is to develop students' conceptual knowledge of experimental science through project planning and execution, effective communication and teamwork, technical rigor, and peer review.
JOURNAL OF THE SOCIETY FOR INFORMATION DISPLAY
(2023)
Article
Materials Science, Multidisciplinary
David W. Gardner, Jiaqi Li, Martin Kunz, Wei-Chih Liao, Chenhui Zhu, Carlo Carraro, Paulo J. M. Monteiro, Roya Maboudian
Summary: This article investigates the intergrain and intragrain interactions of calciumsilicate-hydrates (C-S-H), nanocrystalline forms of tobermorites, which control the long-term stress response of concrete. Through experiments, it is found that layer stacking disorder significantly increases in 11 angstrom tobermorite powder. Similar results are observed in nanocrystalline C-S-H powders, where layer stacking disorder (in the form of intragrain deformation) increases with low water content and large basal spacing.
Article
Chemistry, Physical
Zhou Li, Chen Liu, Jessica Jane Frick, Adrian K. Davey, Matthew N. Dods, Carlo Carraro, Debbie G. Senesky, Roya Maboudian
Summary: This work presents the synthesis, characterization, and absorption capacity of graphene aerogel loaded with UiO-66-NH2 metal organic framework (MOF). The density-tunable MOF/GA composites were synthesized by adjusting the mass ratio of MOF to graphene oxide (GO) in the starting solution. Scanning electron microscopy (SEM) images and pore size calculations showed that MOF loading affected the macroporous structure of the GA framework but not the mesoporous structure. The MOF loading exhibited minimum density for the 10-30% samples. MOF-30%/GA demonstrated the highest absorption capacity for chloroform among all solvents tested.
Article
Chemistry, Physical
Bowen Zheng, Chen Liu, Zhou Li, Carlo Carraro, Roya Maboudian, Debbie G. Senesky, Grace X. X. Gu
Summary: Graphene aerogel (GA), a 3D carbon-based nanostructure built on 2D graphene sheets, is the lightest solid material ever synthesized. This study systematically investigates the mechanical properties and structural integrity of GA, revealing that smaller and less spherical inclusions during the preparation process are conducive to strength and stiffness but may lead to brittleness. The study also highlights the requirement of a minimum number of bonds per atom for a structurally valid GA in molecular dynamics simulations.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2023)
Article
Nanoscience & Nanotechnology
Jose Padovani, Ali M. Ibrahim, Stefanie S. Jeffrey, Yasser H. Anis, Roger T. Howe
MICROFLUIDICS AND NANOFLUIDICS
(2020)
Article
Materials Science, Biomaterials
Siyi Cheng, Xiang Gao, Steven DelaCruz, Chen Chen, Zirong Tang, Tielin Shi, Carlo Carraro, Roya Maboudian
JOURNAL OF MATERIALS CHEMISTRY B
(2019)