Article
Chemistry, Physical
Gui-Cang He, Li-Na Shi, Yi-Lei Hua, Xiao-Li Zhu
Summary: This work investigates the electron-phonon, phonon-phonon, and phonon structure scattering mechanisms and their impact on the thermal and thermoelectric properties of a silver nanowire (AgNW). The study reveals that the electron-phonon scattering rate decreases with increasing temperature, while the phonon-phonon scattering rate increases and surpasses the electron-phonon scattering rate above the Debye temperature. The rate of phonon structure scattering remains constant. The thermal conductivity of the AgNW exhibits an opposite trend to the total phonon scattering rate with temperature. The thermoelectric properties of the AgNW are heavily influenced by the thermal conductivity, and the figure of merit (ZT) of the AgNW is found to be significantly higher than that of bulk silver at room temperature.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Qian Zhang, Zonglin Yi, Ying Liu, Peide Han, Jun Mei
Summary: Graphene-embedded Cu matrix composites have great potential in various engineering fields, but weak interfacial interactions between the metallic matrix and carbonaceous graphene pose a major issue. By incorporating heterogeneous alloying elements into the Cu matrix to reconstruct the graphene-Cu interface, the tensile properties of GE-CMCs can be significantly improved.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Physical
John Robinson, Sai Priya Munagala, Arun Arjunan, Nick Simpson, Ryan Jones, Ahmad Baroutaji, Loganathan T. Govindaraman, Iain Lyall
Summary: Efficient and power-dense electrical machines are crucial for driving the next generation of green energy technologies. This study focuses on the Additive Manufacturing (AM) of custom copper (Cu) and silver (Ag) windings, aiming to improve efficiency through optimized materials and geometries. The study utilizes Laser Powder Bed Fusion (L-PBF) technology to process high-purity Cu, Ag, and Cu-Ag alloys, and investigates their electrical conductivity performance. Proof-of-concept electrical machine coils are successfully fabricated using 400 W L-PBF processing, indicating the potential for this technology in advancing the current state of the art.
Article
Instruments & Instrumentation
Wurui Ta, Xiaoyu Tang, Youhe Zhou
Summary: Interface stress and contact resistance are crucial for the safety and stability assessment of non-insulated superconducting pancake coils. A new electrometric method is developed to measure and analyze the interfacial stresses and contact resistances of composite superconducting coils under extremely low temperature conditions. The mechanical and electrical behaviors are coupled through an extended electro-mechanical contact model, which reveals the interaction mechanism of the coil. The proposed method is verified through comparison with experimental results, and provides a basis for evaluating the transport and mechanical performance of superconducting coils.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Nanoscience & Nanotechnology
S. Sibilia, F. Bertocchi, S. Chiodini, F. Cristiano, L. Ferrigno, G. Giovinco, A. Maffucci
Summary: This paper investigates the temperature dependence of the electrical resistivity of low-cost commercial graphene-based strips, finding a linear trend and negative temperature coefficient in a wide temperature range. The derived analytical model of temperature-dependent resistivity is validated for heating applications using the graphene strips. These materials can potentially be used as thermistors in sensing or heating applications.
Article
Engineering, Electrical & Electronic
Bo-Ding Wu, Fei-Yi Hung
Summary: This study investigates the energization and high-temperature damage characteristics of pure aluminum and copper wires. The voltage of the copper wire shows a stable upward trend with the increase in current, while the resistance of aluminum wire increases abnormally when the current increases continuously, resulting in an overload resistance zone and incandescence. The length of copper wire has no obvious effect on electrical properties, but decreasing the length of aluminum wire decreases the width of the overload resistance zone. The surface temperature of the copper wire is about 900 degrees C when energized, whereas the surface temperature of aluminum wire is about 600 degrees C when energized. The mechanical properties of the aluminum wire in the overload resistance zone are deteriorated due to the incandescent phenomenon caused by the micro-AlNi eutectic cladding structure. Incorporating a trace amount of nickel can improve the strength and corrosion resistance in aluminum wire, but the voltage and current need to be controlled to avoid incandescence or affecting electrical and thermal stability.
MICROELECTRONICS RELIABILITY
(2022)
Review
Materials Science, Multidisciplinary
Danning Fu, Rendang Yang, Yang Wang, Ruibin Wang, Feiguo Hua
Summary: Silver nanowires (AgNWs) have gained significant attention due to their high conductivity and transparency, and have been extensively studied for various applications. This review discusses recent advances in the synthesis of AgNWs and their structural regulation, as well as comprehensively reviews and analyzes the advantages, applications, prospects, and challenges of AgNW composites in different fields.
ADVANCED MATERIALS TECHNOLOGIES
(2022)
Article
Materials Science, Ceramics
J. P. Goulmy, G. Camus, F. Rebillat
Summary: Three ceramic matrix composites (CMCs) were characterized in tension to further develop and understand the data provided by electrical resistance measurements. The observed changes in electrical resistance were compared to acoustic emission spectra and classical unloading/reloading cycles. A model was proposed to predict the evolution of resistance as a function of the damage state of the three composites, providing accurate results for materials with different mechanical and physical behaviors.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Multidisciplinary
Chenxi Li, Nan Wang, Qiyun Lei, Julian Evans, Sailing He
Summary: The study proposes a method to align silver nanowires using uniaxial nematic cellulose nanocrystal liquid crystals, achieving anisotropic orientation of AgNWs for the preparation of low-cost, innovative optical materials and devices.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
Fei Cao, Xingde Zhang, Gezhi Dong, Yihui Jiang, Fan Gao, Pengtao Cai, Tongmin Wang, Shuhua Liang
Summary: The effect of Ce content on the microstructures, electrical conductivity, and tensile strength of (TiB2p + TiBw)/Cu composites was studied. It was found that an appropriate amount of Ce can improve the microstructures and properties of the composites, while excessive Ce leads to performance deterioration.
ADVANCED ENGINEERING MATERIALS
(2022)
Article
Biochemistry & Molecular Biology
Salomao Dos Santos Costa, Juliana Pereira da Silva, Matheus Moraes Biondo, Edgar Aparecido Sanches, Marcos Marques Da Silva Paula, Francisco Xavier Nobre, Jose Anglada Rivera, Yohandys Alexis Zulueta, Milton S. Torikachvili, David Vieira Sampaio, Marcos Vinicius Dias Vermelho, Stefan Talu, Lianet Aguilera Dominguez, Yurimiler Leyet
Summary: The temperature dependence of the electrical properties of composites formed by biphasic sodium titanate and poly(o-methoxyaniline) was studied. The structural details were confirmed by X-ray diffraction, and the thermal properties were analyzed by thermogravimetry and differential thermal analysis. The complex impedance spectroscopy measurements showed that the electrical resistivity of the composites increased with POMA content, and the highest POMA content exhibited a less noticeable temperature coefficient of resistivity.
Article
Engineering, Chemical
Z. Sahebi Hamrah, M. Pourabdoli, V. A. Lashgari, M. H. Doost Mohammadi
Summary: This study investigated the effects of temperature, time, filler content, and graphite addition on the performance of conductive adhesives. The results showed that temperature and silver content had significant impacts on the electrical resistivity of the adhesives, while the addition of graphite prevented copper oxidation and improved conductivity.
INTERNATIONAL JOURNAL OF ADHESION AND ADHESIVES
(2022)
Article
Nanoscience & Nanotechnology
Yiting Chen, Greg Bannard, R. Stephen Carmichael, Tricia Breen Carmichael
Summary: Silver nanowires (AgNWs) are promising materials for transparent conductive electrodes in optoelectronic devices, but their practical use is hindered by corrosion under ambient conditions. This study presents a novel approach using a transparent synthetic rubber, TBR, as a stretchable substrate and a protective gas barrier, which effectively prevents corrosion and enhances the durability of AgNW networks.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Wei-Tsu Peng, Fu-Ren Chen, Ming-Chang Lu
Summary: This study investigated the electrical and thermal properties of copper nanowires (CuNWs), revealing that structural scattering is the predominant mechanism in the electrical current transport and heat transfer in the nanowires. The residual resistivity and electron-phonon coupling parameter were found to increase with the degree of structural scattering. High values of residual unified thermal resistivity and electron-phonon-induced unified thermal resistivity were also discovered in the CuNWs.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Gui Bing Hong, Yi Hua Luo, Kai Jen Chuang, Hsiu Yueh Cheng, Kai Chau Chang, Chih Ming Ma
Summary: In this study, silver nanoparticles were successfully prepared using a chemical reduction synthesis method, followed by low-temperature sintering to obtain Ag-conductive ink for flexible substrate application. The size and shape of the AgNPs were well controlled by varying reaction parameters, and the electrical resistivity of the ink was optimized under specific sintering conditions. These findings may have implications for future research on other metals as well.
Article
Chemistry, Physical
Linda Abbassi, David Mesguich, Loic Coulomb, Geoffroy Chevallier, Romain Aries, Claude Estournes, Emmanuel Flahaut, Romain Viennois, Mickael Beaudhuin
Summary: In this paper, a simple route to synthesize nano-beta-FeSi2 material is reported. The impact of spark plasma sintering parameters on the material properties is studied. Experimental results show that high-density nano-beta-FeSi2 pellets can be obtained using this method in a short time.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
M. Mejri, B. Malard, Y. Thimont, D. Connetable, P. Floquet, R. Laloo, A. Proietti, C. Estournes
Summary: This study aims to investigate the mechanical and elastic characteristics of the Mn15Si26 compound through experimental nanoindentation measurements and ab-initio calculations. The research indicates that crystallographic orientations significantly affect the elastic modulus and nanohardness of Mn15Si26, with values along <001> orientations higher than <100> ones.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Materials Science, Multidisciplinary
Bowen Pu, David Mesguich, Claude Estournes, Xiang Zhang, Geoffroy Chevallier, Naiqin Zhao, Christophe Laurent
Summary: A novel method for synthesizing graphene nanosheets (GNS) decorated with Cu nanoparticles in aluminum-based composites is proposed in this study. By adjusting the conditions of spark plasma sintering (SPS), the interface structure can be finely controlled, which affects the microhardness and elastic modulus of the composites.
JOURNAL OF MATERIALS SCIENCE
(2022)
Article
Materials Science, Ceramics
Thomas Herisson de Beauvoir, Pierre-Louis Taberna, Patrice Simon, Claude Estournes
Summary: This paper presents the application of in situ impedance analysis in the Cold Sintering Process (CSP), specifically focusing on the influence of acetic acid on the sintering of ZnO and the resulting ceramics. The results demonstrate that this in situ characterization technique has the potential to be applied to a wide range of materials.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Andreas Flaureau, Alicia Weibel, Geoffroy Chevallier, Jerome Esvan, Christophe Laurent, Claude Estournes
Summary: Carbon is deposited onto a commercial 3YSZ powder bed using chemical vapor deposition, resulting in a few-layered-graphene (FLG) film. The powders are then consolidated by spark plasma sintering, leading to FLG located along the grain boundaries of the 3YSZ matrix. Pure 3YSZ exhibits higher toughness and fracture strength compared to composites, but the toughness of composites increases with increased carbon content. The composites are electrically conducting within a certain carbon concentration range.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Chemistry, Multidisciplinary
David Mesguich, Lilian Moumaneix, Victor Henri, Morgan Legnani, Vincent Collie, Jerome Esvan, Armelle Ouali, Pierre Fau
Summary: In this study, we demonstrate the efficient decoration of double-walled carbon nanotubes (dwCNTs) with copper nanoparticles (NPs) and atoms through strong acidic oxidation. The resulting nanocomposite exhibits excellent stability and catalytic performance. This finding is of great significance for the modification and application of carbon nanotubes.
Article
Materials Science, Ceramics
Precious Manti Radingoana, Sophie Guillemet-Fritsch, Jacques Noudem, Peter Apata Olubambi, Geoffroy Chevallier, Claude Estournes
Summary: In this study, Al-doped ZnO ceramics were sintered at varying temperatures, pressures, and pressure application temperatures using spark plasma sintering. The ceramics achieved a maximum relative density of 98.9% at a temperature of 650 degrees Celsius and pressure of 250 MPa. The Al-doped ZnO ceramics exhibited enhanced electrical conductivity, decreased Seebeck coefficient, and reduced thermal conductivity, resulting in a ZT value of 0.016 at 500 degrees Celsius.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Crystallography
Doaa Omar A. Ali, Marco Fabbiani, Loic Coulomb, Simon Bosc, Benjamin Villeroy, Camille Estournes, Claude Estournes, Michael Marek Koza, Mickael Beaudhuin, Romain Viennois
Summary: We propose a new reactive spark plasma sintering (RSPS) technique to synthesize the rhombohedral Ca14Si19 phase. The RSPS approach significantly reduces the synthesis time to a few minutes. Through electrical resistivity measurements, we determine the energy band gap of Ca14Si19 to be Eg = 0.145(15) eV. The Seebeck coefficient indicates Ca14Si19 as a room temperature p-type semiconductor, but it becomes n-type with increasing temperature due to the compound's narrow bandgap.
Article
Materials Science, Ceramics
Federico Cernuschi, Justyna Kulczyk-Malecka, Xun Zhang, Franck Nozahic, Claude Estournes, Willem G. Sloof
Summary: This study investigated the thermal diffusivity and conductivity of dense and porous binary composites with insulating and conducting phases across the entire composition range. Experimental evaluation was performed on MoSi2 particles embedded in YPSZ through spark plasma sintering (SPS). Thermal diffusivity was measured using Flash Thermography (FT) and Laser Flash Analysis (LFA), and the thermal conductivity was determined based on heat capacity and density measurements. The volume fraction of the conducting phase was determined through X-ray map image analysis using scanning electron microscopy (SEM), while X-ray diffractometry (XRD) with Rietveld refinement determined the phases present and their density. The thermal diffusivity increased with increasing volume fraction of MoSi2. Porosity reduced the thermal diffusivity, but the effect diminished with high volume fractions of MoSi2. Modelling captured the thermal diffusivity as a function of MoSi2 volume fraction in YPSZ composites, accounting for porosity and the percolation of the conductive phase.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Materials Science, Multidisciplinary
Simon Tardieu, David Mesguich, Antoine Lonjon, Florence Lecouturier-Dupouy, Nelson Ferreira, Geoffroy Chevallier, Arnaud Proietti, Claude Estournes, Christophe Laurent
Summary: To achieve the best balance between high strength and low resistivity, the introduction of controlled content of large copper grains in copper-silver composite wires can create fast conduction channels and result in lower resistivity. However, it also leads to a moderate decrease in the mechanical strength of the wires.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Christophe Laurent, David Mesguich, Laura Severac, Rainui Tetihia, Geoffroy Chevallier, Claude Estournes
Summary: The aim of this study is to prepare Fe-Al2O3 ceramic-matrix composites with a high Fe content to achieve a high degree of toughening. Fe-Al2O3 powders with different Fe contents were prepared by selective reduction and dense samples were obtained using Spark Plasma Sintering. The results showed that a continuous Fe network dispersed in the alumina matrix contributed to significantly higher toughness compared to samples with dispersed Fe particles.
Article
Chemistry, Multidisciplinary
Jean-Felix Boue, Cedric Espinet, Simon Amigues, David Mesguich, David Cornu, Yaovi Holade, Julien Cambedouzou, Christophe Laurent
Summary: This study presents the proof-of-concept of spark plasma sintered (SPS) consolidated mesoporous composite catalytic electrodes for the electrocatalytic hydrogen evolution reaction (HER) in alkaline media. The optimized electrode exhibited stable overpotential and controllable physical and catalytic properties. This work provides a new strategy for synthesizing robust electrocatalytic electrodes for the hydrogen evolution reaction.
CHEMICAL COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Thomas Herisson de Beauvoir, Elise Benard, Geoffroy Chevallier, Claude Estournes
Summary: This study prepared yttria stabilized zirconia ceramics using Flash-SPS at different temperatures and analyzed the influence of sintering temperature on microstructure. The results showed that the maximum densification rate was achieved at 1600 degrees C and decreased with increasing sintering temperature. The presence of a thermal gradient in the samples also resulted in heterogeneity in grain size and morphology.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2024)