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
Hanna Bishara, Subin Lee, Tobias Brink, Matteo Ghidelli, Gerhard Dehm
Summary: The study found a consistent relationship between the coincidence site lattice (CSL) type of grain boundaries (GBs) and their resistivity, where high dislocation density and corresponding strain fields contribute to increased resistivity. Additionally, the resistivity of GBs is approximately correlated with their excess volume.
Article
Materials Science, Multidisciplinary
Bangmaya Satpathy, Nandita Kayal, Sambedan Jena, Siddhartha Das, Karabi Das
Summary: This study explored the electrodeposition of an Ag-Cu bimetallic composite coating on a copper substrate using a thiourea-based electroplating bath. The results revealed insights into metal-complex interactions, deposition mechanisms, coating morphology, as well as hardness and resistivity properties of the coatings. The coating exhibited good adhesion to the substrate and similar resistivity to bulk Ag.
MATERIALS CHARACTERIZATION
(2022)
Article
Materials Science, Multidisciplinary
Wei Peng, Jianbao Gao, Tiwen Lu, Binhan Sun, Xiancheng Zhang, Lijun Zhang, Shantung Tu
Summary: In this paper, a multi-order-parameter phase-field model was developed to study the abnormal grain growth (AGG) mechanism in copper thin films. The model was coupled with elastic mechanics and finite element framework to achieve a quantitative simulation of microstructure evolution during AGG. The simulation was further combined with the Mayadas-Shatzkes model to predict the evolution of electrical resistivities, leading to the proposal of feasible strategies for preparing high-performance copper thin films.
Article
Chemistry, Physical
Z. H. Kautsar, H. Sepehri-Amin, Xin Tang, R. Iguchi, K. Uchida, T. Ohkubo, K. Hono
Summary: The resistivities of anisotropic Nd-Fe-B-based magnets were increased in parallel and perpendicular directions to the c-axis by hot-deforming Nd-Fe-B melt-spun flakes coated with DyF3 through electrophoretic deposition. As a result, the operating temperature under high-frequency AC magnetic field decreased by 20°C due to the reduction of eddy current loss. The formation of a resistive layer composed of NdF3 at the interface of original ribbons in the hot-deformed magnet was observed. The excess Dy diffused into the original ribbon flakes and formed a Dy-rich shell in Nd2Fe14B grains, resulting in a high coercivity.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Materials Science, Ceramics
Yanghee Kim, Ji Yeong Lee, Min Kyung Cho, Jae-Pyoung Ahn, Young-Wook Kim
Summary: The electrical properties of polycrystalline ceramics are primarily influenced by the presence of grain boundaries or cores, with the electrical resistivity slowly increasing with an increase in the number of boundaries.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Ceramics
Hiraku Maruyama, Juan C. Nino
Summary: The effects of large thermal gradient annealing on the microstructure of 10 mol% gadolinium doped ceria (GDC) were studied, showing changes in grain orientation, gadolinium diffusion, and enhancement of total conductivity after annealing.
CERAMICS INTERNATIONAL
(2021)
Article
Nanoscience & Nanotechnology
Jonathan Kong, Michel J. R. Hache, Jason Tam, Jonathan L. McCrea, Jane Howe, Uwe Erb
Summary: In this study, the Hall-Petch to inverse Hall-Petch transition of electrodeposited nanocrystalline Ni-32at%Co alloy was investigated. The transition was found to occur in the mid-stage of abnormal grain growth, with grain boundary relaxation governing the inverse Hall-Petch region. Late-stage abnormal grain growth and further normal grain growth led to a reduction in hardness in the Hall-Petch region. The segregation of sulfur impurities, crystallographic orientation, and annealed twin development did not significantly contribute to the observed change in hardness.
SCRIPTA MATERIALIA
(2022)
Article
Chemistry, Multidisciplinary
Maxence Menetrey, Cathelijn van Nisselroy, Mengjia Xu, Julian Hengsteler, Ralph Spolenak, Tomaso Zambelli
Summary: As microelectronics continue to downscale component dimensions, there have been advancements in micro- and nano-scale additive manufacturing (AM) technologies, which offer design freedom for 3D circuitry. However, these techniques have not yet produced device-grade materials. This study focuses on the electrical properties of micrometer-scale copper interconnects fabricated using Fluid Force Microscopy (FluidFM) and Electrohydrodynamic-Redox Printing (EHD-RP). The research highlights the impact of processing on the quality and microstructure of AM metals, as well as the ability to control resistivity through print strategies and printing voltage.
Article
Geosciences, Multidisciplinary
S. C. Pearson-Grant, E. A. Bertrand
Summary: Topography plays a significant role in localizing convective upflows in geothermal systems, improving the accuracy of models and the agreement between upflow locations and low-resistivity zones derived from 3-D inversion of magnetotelluric data.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Chemistry, Physical
Haneul Han, Chaerin Lee, Youjung Kim, Jinhyun Lee, Rosa Kim, Jongryoul Kim, Bongyoung Yoo
Summary: The research demonstrates successful Cu-Cu direct bonding at low temperature using high defect density Cu (HD2 Cu), with grain growth mainly driven by strain energy release.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
Jun Hwan Moon, Seunghyun Kim, Taesoon Kim, Yoo Sang Jeon, Yanghee Kim, Jae-Pyoung Ahn, Young Keun Kim
Summary: Nanoscale ruthenium and ruthenium alloys with low resistivity values are potential candidates for interconnect and barrier materials in integrated circuits. Electrodeposition can produce ruthenium nanowires with excellent resistivity and microstructure.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Haripria T. Padmaganesan, Swastika Banthia, Vishwas Dihari, Sumit Chhangani, M. J. N. V. Prasad
Summary: This study investigates the effect of phosphorous (P) content on the hardness and microstructural evolution in nickel-phosphorous (Ni-P) alloy foils. Excessive P content beyond its solid solubility leads to localized structural heterogeneity and significant grain refinement. The strengthening of the Ni matrix is affected by both grain refinement and internal strain induced by the codeposition of P solute atoms.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Engineering, Chemical
Jhih-Jhu Jhan, Kazutoshi Wataya, Hiroshi Nishikawa, Chih-Ming Chen
Summary: In this study, nanocrystalline Cu was constructed on the bonding surfaces using electrodeposition and direct bonding was carried out in a formic acid atmosphere. The results showed that a well-bonded Cu-Cu joint with a high shear strength of 71 MPa can be achieved by direct bonding of two Cu surfaces with a nanocrystalline structure. Microstructural analysis revealed significant grain growth accompanying the formation of twins at the bonding interface, contributing to the high bonding strength.
JOURNAL OF THE TAIWAN INSTITUTE OF CHEMICAL ENGINEERS
(2022)
Article
Physics, Applied
Jian Liang, Qian Chen, Qingjie Guo, Wei Jiang, Zhaocong Huang, Biao You, Jun Du, Ya Zhai
Summary: This study demonstrates the enhancement of spin dynamic damping in Co40Fe40B20 (CFB) films by capping with neodymium (Nd). The study also reveals that the matched resistivity at both sides of the CFB/Nd interface plays a crucial role in the enhancement. Additionally, the damping enhancement of CFB is not affected by inserting a 1-2 nm Cu layer, but is suppressed when the Cu layer thickness exceeds 3 nm.
APPLIED PHYSICS LETTERS
(2022)
Editorial Material
Chemistry, Physical
V. Ara Apkarian, Eric Potma
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Physical
Bongsu Kim, Junghoon Jahng, Abid Sifat, Eun Seong Lee, Eric O. Potma
Summary: In illuminated tip-sample junctions, light absorption by the sample leads to local heating and thermal expansion of the material, affecting the measured photoinduced force in PiFM experiments. While thermal contributions have been demonstrated in the mid-infrared range, evidence for such thermal effects in the vis/NIR range of PiFM remains elusive. Development of a frequency domain PiFM allows for direct registration of the thermal relaxation dynamics after photoexcitation.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Spectroscopy
Abid Anjum Sifat, Eric O. Potma
Summary: The study focuses on the importance of tip morphology in tip-enhanced Raman scattering (TERS), explores the use of focused ion beams (FIB) for modifying tip structure, and demonstrates improved TERS signal strength through novel tip designs.
JOURNAL OF RAMAN SPECTROSCOPY
(2021)
Article
Multidisciplinary Sciences
Min Hi Park, Jeffrey L. Suhalim, Firas Elmastour, Santu K. Singha, Tadashi Imafuku, Ramanathan Venkatnarayan, Anette Christ, Alena Grebe, Sarah A. Oppelt, Dmitri Sviridov, Michael Bukrinsky, Eicke Latz, Eric O. Potma, Michael L. Fitzgerald
Summary: This study used non-linear optical microscopy to investigate plaque crystal structure and composition in SIV-infected macaques, revealing a cholesterol ester dominated composition. The findings help clarify the evolution of plaque core lipid and its role in systemic inflammation.
Article
Biochemical Research Methods
Richard C. Prince, Eric O. Potma
Summary: Coherent Raman scattering (CRS) microscopy is an optical imaging technique with great potential for biomedical research. Despite significant advancements in specificity, sensitivity, and practicality, broader dissemination of the technique remains a challenge. New developments and technical improvements have expanded the application space of CRS microscopy, but efforts are still needed to attract more users beyond enthusiasts.
JOURNAL OF BIOMEDICAL OPTICS
(2021)
Editorial Material
Multidisciplinary Sciences
Eric O. Potma
Summary: Molecular vibrational signals, which are difficult to detect, can be revealed in bioimaging techniques using light in a 'squeezed' quantum state.
Article
Optics
Eric O. Potma, David Knez, Yong Chen, Yulia Davydova, Amanda Durkin, Alexander Fast, Mihaela Balu, Brenna Norton-Baker, Rachel W. Martin, Tommaso Baldacchini, Dmitry A. Fishman
Summary: The emerging technique of mid-infrared optical coherence tomography (MIR-OCT) utilizes the reduced scattering of MIR light to achieve tomographic imaging at deeper penetration depths, but faces challenges in detection technology. This study demonstrates an alternative approach to MIR tomography with high-speed imaging capabilities using femtosecond nondegenerate two-photon absorption in a conventional Si-based CCD camera.
Article
Optics
Eric O. Potma, David Knez, Martin Ettenberg, Matthew Wizeman, Hai Nguyen, Tom Sudol, Dmitry A. Fishman
Summary: Recent research has shown that wide-field mid-infrared (MIR) imaging can be achieved using standard Si cameras through non-degenerate two-photon absorption (NTA) in semiconducting materials. By utilizing InGaAs as the photosensor, the limitation of low nonlinear absorption coefficient of Si is overcome, enabling high-speed MIR imaging up to 500 fps with under 1 ms exposure per frame, allowing for 2D or 3D mapping without the need for pre- or post-processing of the image.
Article
Nanoscience & Nanotechnology
Abid Anjum Sifat, Filippo Capolino, Eric O. Potma
Summary: The optical chiral properties of tightly focused laser beams can be characterized using force detection. By measuring the chiral properties of a beam in the microscopic focal volume, the difference in force measurements can provide information about the helicity density and the spin angular momentum density of light.
Article
Multidisciplinary Sciences
David Knez, Benjamin W. Toulson, Anabel Chen, Martin H. Ettenberg, Hai Nguyen, Eric O. Potma, Dmitry A. Fishman
Summary: In this study, a novel spectral imaging technique based on nondegenerate two-photon absorption is proposed for high-speed imaging in the mid-infrared range, allowing simultaneous acquisition of morphological and chemical information.
Article
Multidisciplinary Sciences
Jinwei Zeng, Mohammad Albooyeh, Mohsen Rajaei, Abid Anjum Sifat, Eric O. Potma, H. Kumar Wickramasinghe, Filippo Capolino
Summary: We have experimentally demonstrated the detection of magnetic force at optical frequencies, using a photoinduced magnetic dipole and a magnetic nanoprobe under structured light illumination. This method allows the direct detection of the magnetic force, revealing the magnetic nearfield distribution at the nanoscale.
Proceedings Paper
Computer Science, Interdisciplinary Applications
Fernando Rodriguez, Hye Rin Lee, Teomara Rutherford, Christian Fischer, Eric Potma, Mark Warschauer
Summary: The study suggests that for first-generation college students, early planning and self-regulation are crucial for success in online courses, while low engagement may result in lower average grades.
LAK21 CONFERENCE PROCEEDINGS: THE ELEVENTH INTERNATIONAL CONFERENCE ON LEARNING ANALYTICS & KNOWLEDGE
(2021)
Article
Biochemical Research Methods
Yuanchao Liu, Eamonn Murphy, Eric O. Potma, Ivana Matanovic, Dmitry A. Fishman, Plamen Atanassov
Summary: Ammonia, a key industrial nitrogenous product and critical environmental pollutant, has a broad impact on our daily lives. Rapid and sensitive detection of ammonia is crucial for environmental monitoring and industrial manufacturing process control.
Article
Optics
Anastasiya Kazantseva, Elena A. Chernykh, Cameron Crook, Evan P. Garcia, Dmitry A. Fishman, Eric O. Potma, Lorenzo Valdevit, Sergey S. Kharintsev, Tommaso Baldacchini
Summary: This study demonstrates the use of tip-enhanced Raman spectroscopy on polymeric microstructures produced by two-photon polymerization direct laser writing. The TERS method shows a nearly two-fold linear enhancement compared to confocal Raman microscopy, with an estimated effective signal enhancement of about 10(4) due to the smaller probing volume. With high resolution topographical and chemical data provided by TERS, it serves as an effective analytical tool for studying the polymer network homogeneity in TPP microstructures.
JOURNAL OF PHYSICS-PHOTONICS
(2021)
Article
Engineering, Biomedical
Lina Nguyen, Eric O. Potma, Jimmy N. Le, Julie Johnson, Gabrielle Romena, Qian Peng, Kristian Berg, Henry Hirschberg
Summary: In experiments with F98 glioma cell spheroids, FG loaded with drugs demonstrated significant inhibition in both photodynamic therapy (PDT) and photochemical internalization (PCI), with PCI showing a greater effect. Complete growth suppression of the spheroids was achieved after PCI treatment.
LASERS IN MEDICAL SCIENCE
(2021)