Article
Chemistry, Physical
Wen Zhang, Lei Guan, Bing Wang, Huiqiang Liu, Jian Wang, Xiaofan Hong, Junjie Long, Shaobo Wei, Xiao Xiong, Ying Xiong
Summary: This study presents a unique one-step microwave plasma chemical vapor deposition process to fabricate graphite/diamond composite films with high electron field emission performance. The researchers found that sharp edges, appropriate distribution density of nanosheets, and a good electron pathway from the bulk to the surface are key factors for electron field emission performance.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Nanoscience & Nanotechnology
Victor Kleshch, Rinat R. Ismagilov, Vsevolod V. Mukhin, Anton S. Orekhov, Alexander S. Filatyev, Alexander N. Obraztsov
Summary: The study demonstrates that using nano-graphite thin films as field emission cathodes can significantly improve the efficiency of space electric propulsion systems. They successfully designed an electron gun with increased reliability and minimized energy losses.
Article
Materials Science, Multidisciplinary
A. M. Gorbachev, A. A. Vikharev, A. V. Afanasiev, A. L. Vikharev, I. V. Bandurkin, D. B. Radishev, M. N. Drozdov, S. A. Bogdanov
Summary: This study focuses on the experimental investigation of electron photoemission from phosphorus-doped nanocrystalline diamond films under the influence of laser radiation with a wavelength of 266 nm and a pulse duration of 15 ns. Homogeneous NCD films with a thickness of 50-1200 nm were grown on conductive silicon substrates using chemical vapor deposition. The phosphorus content in the films was controlled by adjusting the phosphine content in the hydrogen-methane gas mixture and the substrate temperature. The research established a relationship between the growth conditions, NCD film thickness, and the measured quantum efficiency of diamond photocathodes, revealing that heavily doped NCD films with H-terminated surface of 50 nm thickness exhibit the highest quantum efficiency of 3*10(-5).
Article
Materials Science, Ceramics
A. Bellucci, B. Pede, M. Mastellone, V. Valentini, R. Polini, D. M. Trucchi
Summary: Thin films of nanocrystalline diamond were deposited on highly doped p-type silicon substrates to evaluate the electron emission performance under concentrated sunlight. By comparing the emitted current densities using different light sources, it was found that the concentrated light source increased the emitted current up to 80 times at 600°C, demonstrating the boost on thermionic emission. At temperatures higher than 600°C, the photon-enhanced thermionic emission (PETE) mechanism started to vanish, transitioning to pure thermionic emission. The reduction of the barrier height to 0.33 eV due to the opening of quasi-Fermi levels explained the behavior of the diamond-silicon system in the PETE regime.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Run-Qi Yan, Meng Cao, Yong-Dong Li
Summary: In this study, the inelastic scattering of incident electrons is considered as a crucial process in analyzing the significant differences in secondary electron emission between diamond and graphite. Dielectric functions and energy loss functions were calculated using first-principle calculations. The results reveal that diamond exhibits similar properties in different directions with a lower inelastic mean free path (IMFP) than graphite for electron energies above 30 eV. In graphite, the motion of incident electrons may exhibit directional preferences, resulting in deeper excitation positions and a higher number of secondary electrons moving in the horizontal direction compared to the vertical direction.
Article
Physics, Multidisciplinary
Yao Wang, Sheng-Wang Yu, Yan-Peng Xue, Hong-Jun Hei, Yan-Xia Wu, Yan-Yan Shen
Summary: Nano-diamond particles were co-deposited with metal nanoparticles on Ti substrates using electrophoretic deposition and furnace annealing. The EFE properties of the films were found to be enhanced and then reduced with increasing metal NP concentrations. Ni-doped nano-diamond films showed remarkable EFE properties due to the formation of high conductive graphitic phase from electron-rich Ni NPs.
Review
Materials Science, Multidisciplinary
Orlando Auciello, Dean M. Aslam
Summary: This comprehensive review highlights the progress made in the fundamental and applied materials science of diamond films, focusing on synthesis processes, characterization of properties, integration with other materials, and optimization for MEMS/NEMS device performance. The ultimate goal is to produce transformative impact on global quality of life through the development of advanced sensors, energy generation devices, and other MEMS/NEMS technologies.
JOURNAL OF MATERIALS SCIENCE
(2021)
Article
Chemistry, Physical
J. D. Clayton, M. Guziewski, J. P. Ligda, R. B. Leavy, J. Knap
Summary: Diamond-silicon carbide polycrystalline composite blends are studied using a computational approach that combines molecular dynamics simulations and phase field mechanics. The study shows that grain boundary geometries and local heterogeneities affect material response, and the composition of GB layers also influences the properties.
Article
Chemistry, Multidisciplinary
Dong Yeong Kim, Thomas J. Smart, Jochen Mannhart, Wolfgang Braun
Summary: This study investigates the use of thermal laser epitaxy (TLE) for growing carbon films on sapphire substrates. The results show that the crystallinity of carbon films can be controlled by the substrate temperature during growth. The study also characterizes the dependence of the growth rate on the power of the source-evaporating laser beam.
CRYSTAL GROWTH & DESIGN
(2023)
Review
Physics, Applied
Kamatchi Jothiramalingam Sankaran, Joji Kurian, Balakrishnan Sundaravel, I-Nan Lin, Ken Haenen
Summary: This study focuses on the enhancement of electrical conductivity and field electron emission properties of ultrananocrystalline diamond films via gold ion implantation, and the comparison of characteristics of different implanted species. Additionally, the use of a thin gold coating on silicon substrates covered by diamond films is discussed for improved emission characteristics.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Hongjun Hei, Yanan Su, Yanyan Shen, Jiaqi Zhi, Jie Gao, Ke Zheng, Bing Zhou, Yanxia Wu, Shengwang Yu
Summary: In this work, boron-doped ZnO (BZO) nanoflakes were grown on nanocrystalline diamond (NCD) films by hydrothermal method. B doping inhibited the growth of ZnO along the c-axis direction, forming two-dimensional nanoflakes on the NCD films. With prolonged growth time, the single-layer nanoflakes transformed into multi-layer ones. B doping effectively suppressed the formation of oxygen vacancies and improved the crystal quality of ZnO. The BZO nanoflakes grown for 8 hours exhibited the highest crystal quality and better electron emission properties. Moreover, NCD-based emitters showed longer lifetime and better stability compared with Si-based emitters. These findings demonstrate the promising field-emission performances of BZO nanoflakes/NCD films.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Crystallography
Somnath Bhattacharyya
Summary: Unconventional superconductivity in heavily boron-doped nanocrystalline diamond films has attracted significant interest. The anisotropic superconducting order parameter in these films is believed to be due to the complex structure formed by boron atoms and the introduction of spin-orbit coupling. Breaking the structural symmetry in a layered microstructure reveals the signature of the anisotropic order parameter and explains various transport features observed in these films. The interface states in diamond films can be described by the Shockley model, forming a topologically protected system.
Article
Chemistry, Physical
Lidia Mosinska, Robert Szczesny, Marek Trzcinski, Mieczyslaw Karol Naparty
Summary: The change in methanol content during the HF CVD process can tune the properties of diamond layers.
Article
Materials Science, Multidisciplinary
Salila Kumar Sethy, Kamatchi Jothiramalingam Sankaran, Prasanth Gupta, Joseph Palathinkal Thomas, Ajit Dash, John V. Kennedy, Kam Tong Leung, Ken Haenen
Summary: N- and P-co-ion implantation enhances the electrical conductivity of nanocrystalline diamond films and improves the microplasma illumination characteristics of the films. N ions induce nanographitic phases, while P ions lower the resistance at the diamond-to-Si interface, promoting effective electron transport and achieving improved MI properties.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Brijmohan Paramanik, Debajyoti Das
Summary: In this study, diamond-like carbon (DLC) films with well distinguished nanocrystalline diamond (NCD) grains embedded in the matrix were grown on glass substrates without any pre-treatment using a specially-designed stainless-steel shadow-mask assembly. The composition of the precursor gas and gas pressure in the plasma significantly influenced the relative composition of different carbon phases in the films. The optimum NCD embedded DLC film exhibited a homogeneous microstructure with uniform distribution of NCD grains and high optical transmittance.
APPLIED SURFACE SCIENCE
(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)