Article
Materials Science, Ceramics
Shynar Kultayeva, Young-Wook Kim, In-Hyuck Song
Summary: The study found that doping significantly affects the properties of porous SiC ceramics, with electrical resistivity strongly influenced by doping while thermal and mechanical properties primarily dependent on the necking area between grains. Results show that the electrical conductivity of porous SiC ceramics can be successfully tuned independently of the thermal conductivity through suitable doping.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Rohit Malik, Young-Wook Kim, Woo H. Nam
Summary: Porous SiC ceramics with a core-shell structure were fabricated by sintering nano-SiC powder-carbon black compacts in air. During sintering, oxidation of SiC particles led to the formation of a SiO2 shell, while low-temperature phase transformation and precipitation of non-graphitic carbons were also observed.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Shynar Kultayeva, Young-Wook Kim, In-Hyuck Song
Summary: The study investigated the effects of BN content in porous SiC ceramics on their electrical, thermal, and mechanical properties in N2 and Ar atmospheres. It was found that the electrical resistivity was mainly controlled by the sintering atmosphere, while the thermal conductivity and flexural strength were more influenced by porosity and necking area changes between SiC grains.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Shynar Kultayeva, Young-Wook Kim
Summary: This study investigated the effects of boron carbide (B4C) content and sintering atmosphere on the properties of porous silicon carbide (SiC) ceramics. It was found that the electrical resistivity was lower in the nitrogen-sintered samples, while the thermal conductivity and flexural strength were higher in the argon-sintered samples. The properties were also influenced by the B4C content.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Article
Materials Science, Ceramics
Dulal Das, Maria Dolores Sosa Lucio, Shynar Kultayeva, Young-Wook Kim
Summary: The effects of pore size on the electrical and thermal properties of porous SiC ceramics were investigated. It was found that increasing the pore size resulted in higher electrical and thermal conductivities. This can be attributed to the smaller pore/strut interface area in ceramics with larger pore size, reducing the scattering effects and enhancing the conductivities.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2023)
Review
Materials Science, Ceramics
Muhammad Shoaib Anwar, Syed Zaighum Abbas Bukhari, Jang-Hoon Ha, Jongman Lee, In-Hyuck Song, Young-Wook Kim
Summary: Porous silicon carbide-based ceramics have significant importance in various technical applications due to their exceptional structural and functional properties. The electrical resistivity of porous SiC is influenced by factors such as chemical composition, processing conditions, and microstructure. This article reviews the impact of critical factors and discusses novel applications of porous SiC with controlled electrical resistivity.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Joakim Riikonen, Jimi Rantanen, Rinez Thapa, Nguyen T. Le, Severinne Rigolet, Philippe Fioux, Petri Turhanen, Nelli K. Bodiford, Jhansi R. Kalluri, Timo Ikonen, Tuomo Nissinen, Benedicte Lebeau, Jouko Vepsalainen, Jeffery L. Coffer, Vesa-Pekka Lehto
Summary: A fast and scalable method for producing nanostructured SiC from plant materials through magnesiothermic reduction was developed in this study, resulting in SiC with a crystallite size below 10nm and a high surface area. This approach paves the way for large-scale production of nanostructured SiC using renewable resources and also demonstrates the use of SiC as a metal adsorbent in applications such as wastewater remediation.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Jeong-Ah Yeom, Young-Wook Kim
Summary: The electrical, thermal, and mechanical properties of porous SiC ceramics can be controlled by adjusting the C content and sintering temperature. Within a certain range, increasing C content and sintering temperature can decrease the electrical resistivity and increase the thermal conductivity and flexural strength. The porosity of porous SiC ceramics can be independent of the thermal conductivity and flexural strength by controlling C content and sintering temperature.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2022)
Article
Materials Science, Ceramics
Huaxin Li, Weijian Shen, Fuquan Yang, Chuanyang Lu, Wenjian Zheng, Yinghe Ma, Sendong Ren, Yanming He, Jianguo Yang
Summary: Nitrogen (N)-doped conductive silicon carbide (SiC) can meet diverse requirements in engineering applications and its electrical resistivity can be adjusted by modifying the sintering conditions. The SPS-SiC ceramics are mainly composed of Y-Al-Si-O-C-N glass phase and N-doped SiC, and their properties vary within a certain range.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
S. Cagri Ozer, Kartal Arslan, Servet Turan
Summary: A TiC segregated network structure (SNS) approach was used to enhance the thermoelectric properties of SiC. TiC particles were dry coated on SiC granules to form electrically conductive SNS, which were then sintered at 2200 degrees C. The TiC-SNS increased electrical conductivity and decreased thermal conductivity of SiC, but adversely affected the Seebeck coefficient. An optimized TiC content of 1.5 vol% resulted in a ZT value of 5.04 x 10-3, which is almost 90% higher than any previously reported value for SiC in the literature.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2023)
Article
Optics
I. Gavrilchenko, Y. S. Milovanov, S. Gryn, S. A. Alekseev, A. N. Zaderko, A. G. Shkavro, I. I. Ivanov, V. A. Skryshevsky
Summary: In this study, we reported on the structural and photoluminescence properties of porous silicon carbide formed by electro-chemical etching of SiC plate. The photoluminescence spectrum in the visible region was observed and could be fitted with at least three peaks, with the properties discussed in relation to SEM, TEM, and Raman studies. The nature of the peaks were explained by electron-hole recombination, surface defect centers, and SiC nanocrystallites.
JOURNAL OF LUMINESCENCE
(2021)
Article
Materials Science, Ceramics
Atanu Dey, Nijhuma Kayal, Omprakash Chakrabarti, Nilo M. Fortes, Murilo D. M. Innocentini, Atiar R. Molla, Prasanta Sinha, Srikanta Dalui
Summary: In this study, oxide-bonded porous SiC ceramic filter supports were prepared and their material properties and structure characteristics were investigated. Materials processed by the mullite bonding technique exhibited higher strength and elastic modulus at a similar porosity level. Spray coating method was applied for preparation of oxidation-bonded SiC filtration layer on the porous SiC support compacts.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2021)
Article
Materials Science, Ceramics
Rohit Malik, Young-Wook Kim
Summary: This study demonstrates that the use of alpha-SiC starting powders can achieve low electrical resistivity and high thermal conductivity in PSS SiC ceramics, attributed to their higher sinterability, lower impurity content, and lower phase transformation rate compared to beta-SiC powders.
INTERNATIONAL JOURNAL OF APPLIED CERAMIC TECHNOLOGY
(2022)
Article
Materials Science, Ceramics
Zeynep Ayguzer Yasar, Vincent A. DeLucca, Richard A. Haber
Summary: The study found that under certain sintering conditions (sintering temperature 1900 degrees Celsius, dwell time 10 minutes, intermediate dwell temperature 1400 degrees Celsius, dwell time 30 minutes), adding 0.5 wt% B4C content can achieve the best microstructure and density.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Multidisciplinary
Changzhi Zhao, Chun-e Huang, Meizhen Zhuo, Jiongjiong Yin, Chunying Shen
Summary: This study aims to investigate the effects of calcium carbonate and zirconium dioxide on the microstructure and properties of silicon-bonded silicon carbide porous ceramics. The results showed that an appropriate amount of these additives can enhance porous structures and increase bending strength.
MATERIALS CHEMISTRY AND PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Vitaliy E. Diyuk, Alexander N. Zaderko, Liudmyla M. Grishchenko, Sergii Afonin, Ruslan Mariychuk, Olga Yu. Boldyrieva, Valeriy A. Skryshevsky, Maria Kanuchova, Vladyslav V. Lisnyak
Summary: Fluorination of nanoporous activated carbon (BAU) from birch wood with 1,1,1,2-tetrafluoroethane at temperatures between 400-800 degrees C resulted in the introduction of up to 0.42 mmol of F per gram of BAU. Increasing the temperature to 600 degrees C increased the efficiency, reaching 1.86 mmol of F per gram of BAU. XPS and F-19 solid-state NMR revealed the presence of three group types after treatment, with significant increase in semi-ionic fluorine content at 700 and 800 degrees C.
APPLIED NANOSCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Alexander N. Zaderko, Liudmyla M. Grishchenko, Daniele Pontiroli, Silvio Scaravonati, Mauro Ricco, Vitaliy E. Diyuk, Valeriy A. Skryshevsky, Vladyslav V. Lisnyak
Summary: A medium-temperature fluoroalkylation method for microporous activated carbons was introduced, leading to enhanced specific capacitance and high specific energy for supercapacitor electrodes. The improved performance was attributed to the total fluorine content and high specific surface areas of the carbon electrode materials. Fluoroalkylation at 300-400 degrees Celsius was found to be a simple and cost-effective approach for improving the specific capacitance of carbon-based supercapacitor electrodes.
APPLIED NANOSCIENCE
(2022)
Article
Nanoscience & Nanotechnology
O. Pylypova, O. Havryliuk, S. Antonin, A. Evtukh, V. Skryshevsky, I. Ivanov, S. Shmahlii
Summary: This research aimed to investigate the impact of silicon nanowires geometry and silver nanoparticles on light trapping for solar cells with radial p-n junction. Si-NWs arrays were fabricated using the MacEtch method, and the influence of additional silver nanoparticles on the surface of the nanowires was studied. The absorption, transmittance, and reflectance spectra of periodic nanostructures were calculated using the FDTD method, revealing the potential effects of Ag nanoparticles.
APPLIED NANOSCIENCE
(2022)
Article
Nanoscience & Nanotechnology
Vladyslav V. Lisnyak, Alexander N. Zaderko, Ruslan Mariychuk, Volodymyr Lysenko, Olga Yu. Boldyrieva, Valeriy A. Skryshevsky, Gauhar Mussabek, Yerzhan Taurbayev, Nazym Zhylkybayeva, Oksana Yu. Tananiko
Summary: A novel sensing system for pH measurements was developed based on the enhanced and quenched photoluminescence and UV-Vis absorption of F-, O-, and N-containing carbon nanoparticles. The study characterized the structure and properties of these nanoparticles, and identified the pH response mechanism to be related to deprotonation of functional groups.
APPLIED NANOSCIENCE
(2022)
Article
Nanoscience & Nanotechnology
V. M. Pyeshkova, O. Y. Dudchenko, O. O. Soldatkin, S. A. Alekseev, T. Seker, B. Akata Kurc, S. V. Dzyadevych
Summary: A new three-enzyme lactose amperometric biosensor was developed based on a platinum disc electrode modified by a nanosized semipermeable poly (meta-phenylenediamine) film. The optimized electropolymerization conditions of meta-phenylenediamine resulted in a high sensitivity and selectivity of the biosensor for lactose measurement. The biosensor showed high reproducibility, sensitivity, and selectivity, making it suitable for rapid and accurate determination of lactose in milk samples.
APPLIED NANOSCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Ivan I. Ivanov, Alexander N. Zaderko, Vladimir Lysenko, Thierry Clopeau, Vladyslav V. Lisnyak, Valeriy A. Skryshevsky
Summary: A simple and sensitive method for nonspecific recognition of alcoholic beverages using the photoluminescence of carbon nanoparticles was developed. The method involves synthesizing carbon NPs and analyzing the PL features to visualize different clusters corresponding to each type of beverage. Optimal measurement conditions were defined to ensure reliable recognition.
Article
Optics
I. Gavrilchenko, Y. S. Milovanov, S. Gryn, S. A. Alekseev, A. N. Zaderko, A. G. Shkavro, I. I. Ivanov, V. A. Skryshevsky
Summary: In this study, we reported on the structural and photoluminescence properties of porous silicon carbide formed by electro-chemical etching of SiC plate. The photoluminescence spectrum in the visible region was observed and could be fitted with at least three peaks, with the properties discussed in relation to SEM, TEM, and Raman studies. The nature of the peaks were explained by electron-hole recombination, surface defect centers, and SiC nanocrystallites.
JOURNAL OF LUMINESCENCE
(2021)
Article
Chemistry, Physical
Hafsa Karroum, Sergey Chenakin, Sergei Alekseev, Viacheslav Iablokov, Yizhi Xiang, Vincent Dubois, Norbert Kruse
Summary: This study presents a one-step-one-pot synthesis of chain-lengthened aliphatic amines and nitriles using potassium-promoted Co/MnOx catalysts, showing that the reaction can be tuned by adjusting the H-2/CO ratio. Additionally, the addition of NH3 strongly favors the formation of chain-lengthened olefins over alkanes.
Article
Chemistry, Multidisciplinary
Andriy O. Sobchuk, Maxim M. Lazarenko, Kateryna S. Yablochkova, Roman Dinzhos, Nataliia M. Fialko, Mykhaylo Lazarenko, Dmitriy A. Andrusenko, Svitlana Gryn, Andriy Brytan, Alexander M. Alekseev
Summary: This paper discusses the temperature dependencies of complex dielectric permittivity obtained at different frequencies for substituted cellulose derivatives with various concentrations of the hydroxypropoxy group. It is found that substituted cellulose derivatives undergo a low-temperature dielectric relaxation. The contribution of dielectric relaxation to dielectric permittivity decreases when OH groups in cellulose molecules are substituted by methoxy groups, but increases when OH groups are substituted by hydroxypropoxy groups. Dielectric spectroscopy is shown to be a reliable method to estimate the degree of substitution of hydroxyl groups with hydroxypropoxy groups in cellulose derivatives used in the pharmaceutical industry.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Sergey P. Chenakin, Sergei A. Alekseev, Norbert Kruse
Summary: XPS and DRIFTS were utilized to investigate the isothermal decomposition of MnC2O4, revealing two pathways for decomposition leading to the formation of MnO and MnCO3. Graphitic carbon formation was observed in the reaction products, associated with interface chemical reactivities between MnO particles and the supporting gold foil.
INORGANIC CHEMISTRY
(2022)
Article
Chemistry, Multidisciplinary
Gauhar Mussabek, Nazym Zhylkybayeva, Ivan Lysenko, Pavlo O. Lishchuk, Saule Baktygerey, Dana Yermukhamed, Yerzhan Taurbayev, Gani Sadykov, Alexander N. Zaderko, Valeriy A. Skryshevsky, Vladyslav V. Lisnyak, Vladimir Lysenko
Summary: Nitrogen- and oxygen-containing carbon nanoparticles (O, N-CDs) were prepared using a cost-effective solvothermal method. These nanoparticles showed significant photothermal responses and temperature-dependent photoluminescence, making them suitable for temperature evaluation and hyperthermia applications.
Article
Chemistry, Physical
Kateryna I. I. Hnatiuk, Yuri F. F. Zabashta, Maxim M. M. Lazarenko, Sergei A. A. Alekseev, Kateryna S. S. Yablochkova, Michael V. V. Ushcats, Roman V. V. Dinzhos, Liena Yu. Vergun, Dmytro A. A. Andrusenko, Aleksander N. N. Alekseev, Leonid A. A. Bulavin
Summary: This study investigates the scale effect of dielectric relaxation in nanocrystals, specifically how the relaxation parameters depend on the size of the nanocrystal. A model is proposed to explain the scale effect caused by thermally activated motion, considering each nanocrystal as a physical infinitesimal volume where local equilibrium exists. It is concluded that energy fluctuations in the nanocrystal as a whole are caused by thermally activated motion, and the intensity of these fluctuations decreases with decreasing nanocrystal sizes. Experimental data using complex dielectric permittivity of composites support the predictions of the model.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Multidisciplinary
Anastasiia Kornii, Anna Borets, Vladyslav V. Lisnyak, Sergei Alekseev, Oksana Tananaiko
Summary: The study utilized nanostructured screen-printed carbon electrodes modified with silica-based composite films containing metal oxides and graphene oxide for the detection of H2O2. The modified electrodes showed improved electrocatalytic performance and wide linear detection ranges for H2O2.
MOLECULAR CRYSTALS AND LIQUID CRYSTALS
(2021)
Article
Chemistry, Inorganic & Nuclear
Sergey P. Chenakin, Sergei A. Alekseev, Norbert Kruse
Summary: XPS and DRIFTS were used to study the isothermal decomposition of MnC2O4 under different environmental conditions, revealing its decomposition kinetics and the composition of the final products. This helps to better understand the thermal decomposition mechanism of this compound.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Shuanghui Zeng, Xue Wang, Yunqian Zhang, Jiaojing Shao, Zhao Ding, Jie Zhao
Summary: A free-standing 3D core/shell composite material CNTs@Co9S8 on nickel mesh has been prepared using a simple two-step method. The composite material exhibits excellent conductivity and charge storage capability, making it a promising candidate for supercapacitor applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Marieta Belcheva, Georgi Georgiev, Boyko Tsyntsarski, Urszula Szeluga, Lyudmila Kabaivanova
Summary: This study successfully prepared new antibacterial materials by combining activated carbon with metal nanoparticles, taking advantage of the well-known antibacterial activity of metal nanoparticles. The obtained composites exhibited strong antibacterial effects against E. coli and S. aureus, with the antibacterial activity depending on the contact time, bacterial species, nature of the metal, and metal concentration. The findings provide novel materials with antibacterial properties for further development and potential application in hygiene devices.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
V. P. Madhurima, Kusum Kumari, P. K. Jain
Summary: In this study, carbon nanomaterials were synthesized using the arc discharge technique, with a focus on optimizing process parameters to improve yield and quality. The materials were characterized using various analytical tools, and their dye adsorption capabilities were evaluated. The results showed that carbon soot had better adsorption performance compared to carbon nanotubes, indicating the potential of these carbon nanomaterials for environmental remediation applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Zhaolong Sun, Bo Cui, Pingping Liang, Qimeng Liu, Nan Gao, Hongdong Li
Summary: This study explores the potential of hafnium (Hf) terminated diamond surfaces in achieving negative electron affinity (NEA). By using swarm-intelligence structural search and first-principles calculations, the researchers found that Hf-terminated diamond surfaces exhibit stable NEA properties and high thermal stability, making them promising candidate materials for electron emission applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
N. Soltani, N. Tavakkoli, E. Eslami, L. S. Mirmohammadi
Summary: In this project, a carbon paste electrode modified with graphene and ZnFe2O4 spinel nanoparticles (Gr/ZnFe2O4/CPE) was used to measure naproxen, and various electrochemical methods were used to investigate its behavior. By optimizing the parameters, good measurement results were obtained.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Xiwei Cui, Yue Qin, Xin Han, Huanyi Chen, Xinxin Ruan, Hui Zhang, Chengcheng Jiao, Rongqi Mao, Jinglin Hao, Sizhuang Zhao, Shuai Hou, Xiaoxuan Pian, Yandong Wang, Kazuhito Nishimura, Lifen Deng, Nan Jiang
Summary: This paper investigates the friction and wear behaviors of two types of polycrystalline diamonds against different materials. The results show that increasing surface roughness leads to an increase in coefficient of friction. The coefficient of friction and wear rate of ceramic Si3N4 balls are generally lower than those of steel GCr15 balls, except for one type of polycrystalline diamond. Transfer films of SiO2 and its hydrate are observed at the friction interface, which contribute to smoother friction and wear. Carbon-based transfer films are also identified, mainly catalyzed by residual cobalt in the polycrystalline diamonds, leading to a phase transformation.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Menglei Sun, Pengjun Li, Mao Wang, Yidan Liang, Xudong Yang, Shujie Pang
Summary: In this study, carbonized polymer dots were synthesized by a one-step hydrothermal method, and silver nanoclusters were synthesized by UV lamp irradiation. They were then self-assembled by electrostatic force to prepare a dual-emission fluorescent nanocomposite that responds to temperature changes. The nanocomposite showed two emission peaks and exhibited excellent linearity between 20°C and 80°C.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Mohamed J. Saadh, Durgesh Singh, Diego Mayorga, Anjan Kumar, Maria Albuja, Ahmad Ismael Saber, Mohammed Ahmed Mustafa, Yasser Elmasry, Noubu Sun
Summary: Based on density functional theory, it is found that the C3N monolayer has good adsorption capability for Hg0 and a short recovery time. This study suggests that the C3N monolayer is a promising adsorbent material for efficient control of gaseous mercury.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Rajendra Kumar Nare, Sivalingam Ramesh, Vijay Kakani, Yuvaraj Haldorai, Chandrasekaran Karthikeyan, Basivi Praveen Kumar, Nadavala Siva Kumar, Mohammad Asif, S. Naresh Kumar, D. Prakash Babu, K. Ramakrishna Reddy, Visweswara Rao Pasupuleti
Summary: This study examines the latest advancements in carbon nanotube (CNT) supercapacitors and related composites, aiming to identify strategies for enhancing their performance. The researchers used ultrasonication aided hydrothermal technique to synthesize a composite made of nitrogen doped carbon nanotubes and porous NiCo2O4 nanomaterial. The composite electrode exhibited excellent cycling stability and a rising specific capacitance, making it appealing for high-performance supercapacitor applications.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
D. Mary Deena, S. Arockia Anushya, A. Dhanusha, T. C. Sabari Girisun, A. Philominal
Summary: A single-beam Z-Scan experiment was conducted to investigate the nonlinear optical absorption and optical limiting properties of Bi2O3, rGO/Bi2O3, Bi2O3/WO3, and rGO/Bi2O3/WO3 nanostructures. The results showed that the synthesized nanostructures exhibited varying levels of nonlinear absorption, with bismuth-based nanostructures showing the lowest optical limiting threshold and a higher two-photon absorption coefficient. The presence of rGO contributed to the extended conjugation for charge transfer, while the strong UV-Visible absorption of Bi2O3 and WO3 led to a unique nonlinear optical response.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Weibing Guo, Yiren Hu, Tao Wang, Xiaoguang Chen
Summary: This study investigated the microstructure and forming mechanism of graphite/copper joints that were brazed using Ti-containing filler. The results showed that increasing the brazing temperature improved the heat transfer and tensile properties of the composites. Additionally, the composites exhibited high heat flux and faster heating rate compared to copper and aluminum.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Ming Li, ZhiWen Wang, Yu Teng, Hongyu Zhao, Bowei Li, Yang Liu, Shengxue Wang, Zhenze Yang, Liangchao Chen, Hongan Ma, Xiaopeng Jia
Summary: In the experiment, different Ni-content catalysts were used to synthesize diamond crystals, and the properties of the synthesized diamonds were analyzed. The results revealed that the Ni content in the catalyst affects the crystallinity of diamond crystals and the nitrogen crystallinity. The photoluminescence spectroscopy also showed that the diamond synthesized by using Fe-containing catalyst has specific NV-color center structure.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Ling-Feng Mao
Summary: This study proposes an LSTM model to predict the work function of adsorbed metal atoms on graphene, which can quickly screen surface structures with target work function, saving computing and time costs, and improving device performance.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Runzhou Xu, Yinshui Liu, Qian Cheng, Zhenyao Wang, Kai Ma, Peiling Ke, Yipan Deng
Summary: The wear resistance of 17-4PH stainless steel was significantly improved by depositing multi-layered Cr/CrC/DLC coating at wide temperature range. The coating exhibited excellent lubrication and protective properties, and the wear mechanism changed with increasing temperature. The tribochemical reaction during the wear process played a crucial role in the graphitization transformation and friction properties of the coating.
DIAMOND AND RELATED MATERIALS
(2024)
Article
Materials Science, Multidisciplinary
Xilong Guo, Jiaxin Song, Shanling Wang, Li Lei, Omololu Odunmbaku, Ayoub Taallah, Yi He, Aiqun Gu, Filippo S. Boi
Summary: The recent observations of superconductive-ordering in carbon-based systems consisting of rhombohedral stacking-faults, trilayer graphene (ABC-stacks) or dislocation-rich interfaces (pyrolytic graphite) have attracted significant attention. In this study, an unusual nucleation of rhombohedral stacking-faults in low-dimensional systems comprising of multiwall carbon nanotube (CNT) buckypapers was reported. The presence of sulfur doping resulted in a broad-band at the Raman shift from 1800 to 2000 cm(-1), indicating contributions arising from disorder-rich regions with rhombohedral stacking-order (ABC-stacks). These observations were further supported by X-ray diffraction and Rietveld refinements.
DIAMOND AND RELATED MATERIALS
(2024)
