Article
Materials Science, Coatings & Films
Ippei Tanaka, Hiroshi Okubo, Yasunori Harada
Summary: The study investigates the synthesis of diamonds on three-dimensional metal surfaces using MVP deposition, focusing on how pressure and bias voltage influence the diamond structure. The results show that MVP makes it possible to deposit diamond on 3D shape substrates, with diamond particles created at specific bias voltages and methane concentrations.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Physics, Applied
V Mazieres, O. Pascal, R. Pascaud, L. Liard, S. Dap, R. Clergereaux, J-P Boeuf
Summary: This paper discusses the innovative space-time plasma-steering source for controlling plasmas in overmoded cavities, introducing the key plasma-steering criterion and highlighting the importance of plasma density on plasma control capabilities.
PHYSICAL REVIEW APPLIED
(2021)
Article
Materials Science, Multidisciplinary
Artem Martyanov, Ivan Tiazhelov, Sergey Savin, Valery Voronov, Vitaly Konov, Vadim Sedov
Summary: This study reports the complex effect of microwave plasma chemical vapor deposition conditions on the morphology, growth rate, and phase composition of polycrystalline diamond (PCD) films. It is found that diamond growth is possible even at ultrahigh methane concentrations, including 100% methane gas. Lower substrate temperatures facilitate the formation of higher-quality PCD films but result in lower growth rates. This research is an important step towards controlling the properties of CVD-grown PCD material for precise and flexible diamond production for various applications.
Article
Physics, Applied
Weikang Zhao, Yan Teng, Kun Tang, Shunming Zhu, Dongyang Liu, Kai Yang, Jingjing Duan, Yingmeng Huang, Ziang Chen, Jiandong Ye, Shulin Gu
Summary: This paper presents a novel design of the gas inlet system in a diamond microwave plasma chemical vapor deposition growth chamber. The design aims to achieve high-quality, high-speed, and high-efficiency diamond material fabrication. By introducing a gas inlet hole into the susceptor, the ways of gas introduction for diamond growth are expanded. Extensive numerical and experimental investigation has shown that methane and doping gas can be introduced from the hole below while hydrogen is introduced from the top to realize the desired target. The gas distribution in the chamber is influenced by the difference in gas inlet modes, resulting in a plasma state change.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Jiadong Shi, Xurui Feng, Yabo Huang, Yuting Zheng, Liangxian Chen, Jinlong Liu, Chengming Li, Junjun Wei
Summary: In this study, a novel method for growing carbon nanotubes on diamond and silicon substrates was presented. The results showed dense multi-walled carbon nanotubes growing on the diamond substrate, while the Ni catalyst nanoparticles on the silicon substrate were randomly distributed. A unique transition layer was observed between the diamond and carbon nanotubes, where the Ni particles acted as anchors to connect them.
Article
Chemistry, Physical
Zachary Jeckell, Dhruval Patel, Andrew Herschberg, Tag Choi, David Barlaz, Lucia Bonova, Ivan Shchelkanov, Brian Jurczyk, David Ruzic
Summary: This study demonstrates the barrier coating and adhesion promoting properties of silica-based coatings deposited using an atmospheric pressure plasma torch, showing their potential application in lightweight manufacturing, especially in water protection. The films showed significant improvement in shear stress compared to controls and maintained strong shear strength even after exposure to water soak, showcasing their capabilities as a water barrier.
SURFACES AND INTERFACES
(2021)
Article
Multidisciplinary Sciences
Meiyan Jiang, Chengke Chen, Ping Wang, Difeng Guo, Sijia Han, Xiao Li, Shaohua Lu, Xiaojun Hu
Summary: Researchers have discovered that diamonds are formed from graphite through phase transformation, rather than etching by hydrogen and carbon species piling up, providing a new approach to prepare large-area diamonds based on large-sized graphite under normal pressure. This finding also contributes to the understanding of the growth mechanism of materials with sp(2) and sp(3) electronic configurations.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Multidisciplinary
Seung Pyo Hong, Kang-il Lee, Hyun Jong You, Soo Ouk Jang, Young Sup Choi
Summary: A method for large-area diamond synthesis was developed using multiple point plasma sources and wafer scanning, achieving good film thickness uniformity and particle distribution uniformity. This novel approach could potentially be expanded to produce large-area films.
Article
Materials Science, Multidisciplinary
Michael N. R. Ashfold, Yuri A. Mankelevich
Summary: This study applies a two-dimensional self-consistent model to systematically investigate the effects of gas pressure and absorbed power on diamond deposition processes in microwave plasma activated chemical vapor deposition reactors. The study reveals the radial distributions of CH3 radical and H atom concentrations as well as the changes in diamond growth rates under different conditions, providing valuable insights for optimizing deposition regimes.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Physics, Applied
Yusuke Sakai, Keigo Takeda, Mineo Hiramatsu
Summary: This study demonstrates the growth of graphene on Cu foil using PECVD with MNAPP. The density of graphene grain decreases and their average sizes increase with decreasing CH4 flow rate. In MNAPP, the emission intensities of CH and C-2 radicals normalized by that of He atom decrease with decreasing CH4 flow rate. Therefore, controlling the precursor flux is crucial for synthesizing graphene with larger size in PECVD using MNAPP.
JAPANESE JOURNAL OF APPLIED PHYSICS
(2022)
Article
Automation & Control Systems
Vijaykumar S. S. Jatti, Eyob Messele Sefene, Ashwini V. V. Jatti, Akshansh Mishra, Rahul D. D. Dhabale
Summary: This study demonstrates that diamond-like carbon (DLC) coatings optimized through plasma-enhanced chemical vapor deposition (PECVD) process can enhance the performance of drill bits during dry cutting operation of LM6 aluminum alloy and bright mild steel. The DLC coatings were grown over different substrate materials and their properties were measured. The results showed that the DLC-coated substrate had lower wear loss and coefficient of friction than the uncoated substrate, resulting in better surface finish and reduced power consumption during drilling.
INTERNATIONAL JOURNAL OF ADVANCED MANUFACTURING TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Wenxiao Hu, Kai Chen, Tao Tao, Xinxin Yu, Jianjun Zhou, Zili Xie, Bin Liu, Rong Zhang
Summary: This paper presents a study on high-quality (100) single-crystal diamond film grown by microwave plasma chemical vapor deposition (MPCVD). By optimizing the pre-etching process, a smooth surface chemical vapor deposition (CVD) diamond layer with low roughness and high growth rate was achieved, showing potential for high-performance hydrogen-terminal diamond-based electronic devices.
Article
Multidisciplinary Sciences
Andrew G. Tomkins, Nicholas C. Wilson, Colin MacRae, Alan Salek, Matthew R. Field, Helen E. A. Brand, Andrew D. Langendam, Natasha R. Stephen, Aaron Torpy, Zsanett Pinter, Lauren A. Jennings, Dougal G. McCulloch
Summary: Ureilite meteorites, which may be the only samples from a dwarf planet's mantle, contain abundant diamonds. Electron microscopy reveals the distribution of lonsdaleite, diamond, and graphite in ureilites, suggesting a formation process involving pseudomorphic replacement of graphite by lonsdaleite, followed by diamond and graphite formation. This process could be used to manufacture shaped lonsdaleite at high pressure and also provides a model that reconciles conflicting observations about diamond formation in ureilites.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Materials Science, Multidisciplinary
Di Yang, Li Guo, Bisheng Wang, Shuai Jin, Jiaqi Zhu, Ming Zhai
Summary: This paper studied the characteristics of hydrogen plasma in microwave plasma chemical vapor deposition chambers at different conditions. A multiphysics coupling model was established to calculate the effects of deposition pressure and microwave input power on the main characteristics of hydrogen plasma. The research found that different characteristic quantities have differing sensitivities to process parameters, and the volume of the plasma ball increases with increasing microwave power and shrinks with increasing deposition pressure.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2023)
Article
Chemistry, Physical
Kallol Chakrabarty, Paul A. Baker, Vineeth M. Vijayan, Shane A. Catledge
Summary: Boron nitride is a synthetically produced advanced ceramic material that can exist in various polymorphic forms, similar to carbon. The deposition of metastable wurtzite boron nitride through microwave plasma chemical vapor deposition is facilitated by applying a negative DC bias to the substrate, resulting in a higher content of sp(3) bonded BN. This is confirmed by X-ray photoelectron spectroscopy and Fourier transform infrared spectroscopy, with nano-indentation measurements showing an average coating hardness of 25 GPa.