Article
Chemistry, Physical
Xueyu Zhang, Yibao Wang, Zhigang Gai, Mei Zhang, Shousheng Liu, Fengxiang Guo, Nianjun Yang, Xin Jiang
Summary: This paper presents a controllable synthesis method for a diamond/graphene/diamond (DGD) sandwich structure, which effectively addresses the issues of high background current and limited electrochemical window in diamond electrodes. The DGD electrode exhibits fast heterogeneous electron transfer and holds great promise in electrochemical applications.
Article
Physics, Applied
Jin Uk Gwon, Tae Hwan Jang, Min Su Kim, Tae Gyu Kim, Mun Ki Bae
Summary: A boron-doped diamond thin film was synthesized using the HFCVD method, and its surface shape, growth rate, bonding structure, and electrochemical properties were characterized using SEM, Raman spectroscopy, and cyclic voltammetry. The growth rate and crystal size of the film decreased with increasing boron doping concentration, and Raman analysis confirmed the bonding effects of boron on the diamond structure. Cyclic voltammetry analysis showed that the boron-doped diamond thin film had a wide potential window.
MODERN PHYSICS LETTERS B
(2022)
Article
Chemistry, Physical
Jiao Xu, Zhenbao Luo, Sudong Wu, Yulei Li, Yun Yang, Shiyuan Lai, Fuzeng Ren, Jianjun Lin, Dengji Guo, Xujin Wang
Summary: Nanocrystalline diamond films were fabricated with a dual nanostructure by adjusting the CH4 content in the precursor gas, showing consistent lubricant properties and wear rates regardless of grain size variations. The films exhibited lower and more stable friction coefficients after irradiation due to reduced surface roughness and formation of tribofilms with a graphite-like structure. The excellent maintenance of lubrication properties post-heavy-ion irradiation suggests potential for development as anti-irradiation films in nuclear environments.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Ahmed Aliyu, Chandan Srivastava
Summary: The addition of graphene oxide in FeNiCoCu medium entropy alloy coatings significantly changes the microstructure, leading to improved corrosion resistance attributed to enhanced uniformity, grains compactness, impermeability of GO, and formation of a protective Fe-oxide layer.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Yaqiang Wang, Jiadong Zuo, Kai Wu, Jinyu Zhang, Gang Liu, Jun Sun
Summary: The hardness and strain-rate sensitivity of nano Mo thin films increased with decreasing columnar size due to the confined slip of dislocations in the columnar grains.
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2021)
Article
Chemistry, Physical
Xin Chen, Markus Mohr, Kai Bruehne, Hans-Joerg Fecht
Summary: The high electrical conductivity of over 100 S/cm was achieved in nanocrystalline diamond films deposited on silicon single-crystalline substrates by using a methane and hydrogen process gas mixture in an appropriate hot-filament CVD process without further dopant. Oxygen reactive-ion etching process was found to improve the diamond film surface's electron affinity, leading to a reduction in specific contact resistance. The mechanism behind the contact resistance reduction was explained qualitatively in terms of the electron affinity of the diamond surface, confirmed through XPS, AFM, and surface wetting measurements.
Article
Materials Science, Multidisciplinary
Chaimaa Mahi, Ovidiu Brinza, Riadh Issaoui, Jocelyn Achard, Fabien Benedic
Summary: This study investigates the potential of synthesizing nanocrystalline diamond (NCD) films on glass substrates using a Distributed Antenna Array (DAA) microwave system operating at low temperature and low pressure. The results show that the best film properties are achieved at a substrate temperature below 300 degrees C, including high transmittance, low absorption coefficient, and low surface roughness. The wettability of the surface also changes from hydrophilic to hydrophobic after NCD deposition.
Article
Materials Science, Multidisciplinary
Qiu Hong, Dingwen Wang, Shaohui Yin
Summary: This study produced Ni-diamond composite coatings through co-electrodeposition in sulfamate baths with different concentrations of rough-surfaced diamond particles. The addition of diamond changed the preferred orientation of Ni, reduced the ductility of the coatings, and increased the microhardness. The coatings exhibited improved wear resistance, with a microhardness increase from 229 to 613 HV and a reduced coefficient of friction of 0.627 at a diamond content of 3 g/L. The composite coatings also showed excellent corrosion resistance, with a maximum Rp of 6149 omega cm2 obtained at 3 g/L diamond concentration.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Ceramics
Aude Cumont, Ruoying Zhang, Yuting Zheng, Louise Corscadden, Marco R. Oggioni, Chengming Li, Ran Liu, Haitao Ye
Summary: The electronic and mechanical properties, as well as the biocompatibility, make diamond-based materials a promising option for biomedical applications. The cost of producing high-quality single crystal diamond films remains a challenge, but the emergence of polycrystalline diamond films grown by chemical vapor deposition offers a more affordable alternative. The PCD films grown on silicon wafers have been characterized for their nearly pure carbon content, small tensile stress, and antibacterial properties against both Gram-negative and Gram-positive bacteria.
CERAMICS INTERNATIONAL
(2021)
Article
Materials Science, Coatings & Films
Jianguo Qian, Fei Zhou, Qianzhi Wang, Jizhou Kong, Zhifeng Zhou
Summary: NbMoSiC gradient films were successfully deposited on 316L stainless steel by adjusting sputtering power of carbon target. The films exhibited a carbon composition gradient and multiphase structures, resulting in improved hardness and corrosion resistance. The enhanced inhibition effect on ion transport during corrosion reaction was also observed. The dense microstructure formed by the carbon composition gradient structure contributed to the improved corrosion resistance of 316L stainless steel.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Abdelrahman Zkria, Hiroki Gima, Eslam Abubakr, Ashraf Mahmoud, Ariful Haque, Tsuyoshi Yoshitake
Summary: This report presents the synthesis of nanocrystalline diamond (NCD) films by physical vapor deposition method and investigates the effect of nitrogen doping on their structure and electrical conductivity through spectroscopic analysis.
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, Multidisciplinary
Yabo Huang, Liangxian Chen, Siwu Shao, Xiaohua Zhu, Ke Huang, Kang An, Yuting Zheng, Jinlong Liu, Junjun Wei, Chengming Li
Summary: In this study, Er2O3 antireflective films were deposited on CVD diamond substrates using RF magnetron sputtering, and the effects of deposition temperature on the structure, chemical composition, and properties of the films were investigated. Results showed that with increasing deposition temperature, the deposition rate, grain size, and surface roughness of the films increased. Furthermore, hardness and modulus of the Er2O3 antireflective films were enhanced at higher deposition temperatures, improving IR transmittance and adhesion strength on the CVD diamond substrates.
Article
Materials Science, Multidisciplinary
Chenyi Hua, Jun Cai, Lili Li, Pan Pan, Jinjun Feng
Summary: Diamond/graphite composite films with tunable dielectric properties were prepared by microwave plasma chemical vapor deposition. The effect of methane flow rate on the morphology, phase composition, electric conductivity and dielectric properties of the films were investigated. Results showed that methane flow rate played an important role in governing the dielectric properties of the films and the possible microwave attenuation mechanism was explored.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
S. H. Moustafa, Gharieb A. Ali, M. I. Amer, E. R. Shaaban, M. Emam-Ismail, M. El-Hagary
Summary: This paper reports the enhancement of optoelectronic and spintronic properties of Gd-doped ZnS thin films synthesized by electron beam evaporation method. The results show a decrease in optical band gap and an increase in refractive index with Gd doping, along with improved non-linear optical parameters and room temperature ferromagnetic behavior. These findings suggest that Gd-doped ZnS films are promising for optoelectronic and spintronic device applications.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Inorganic & Nuclear
Xiaolong Wang, Dong Fan, Guojun Lan, Zaizhe Cheng, Xiucheng Sun, Yiyang Qiu, Wenfeng Han, Haodong Tang, Huazhang Liu, Yihan Zhu, Xiaojun Hu, Ying Li
Summary: The study found that the single vacancy sites on the surface of defective carbon form strong chemical bonds with ruthenium chloride and increase the electron density of ruthenium ions. On the other hand, the deactivation rate of ruthenium catalysts in acetylene hydrochlorination is closely related to their acidity and coke deposition. Research suggests that defective carbon supported ruthenium catalysts exhibit high catalytic activity and stability.
INORGANIC CHEMISTRY FRONTIERS
(2022)
Article
Nanoscience & Nanotechnology
Dong Fan, Aydin Ozcan, Naseem A. Ramsahye, Guillaume Maurin, Rocio Semino
Summary: Chemical functionalization of the NUS-8 metal-organic framework with a CO2-philic function has been found to enhance the CO2/N-2 separation performance of mixed matrix membranes, resulting in a significant increase in CO2 permeability and selectivity by increasing the MOF/polymer interfacial pore volume and CO2-affinity.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Shaohua Lu, Kai Zhu, Xiaojun Hu
Summary: This study explores the potential applications of experimentally synthesized ZrO2 monolayer as the cathode catalyst for nonaqueous lithium-oxygen batteries. It shows that Zr atoms in the substrate play a critical role in stabilizing the LiO2 cluster, leading to a new peroxide-like adsorption geometry as the most stable configuration. The ab initio calculations indicate that both the ORR and OER catalytic activities are most likely to adopt the four-electron mechanism with low overpotentials. Additionally, the adsorption energy of Li2O2 is found to be a good descriptor for both ORR and OER catalytic activities.
ACS APPLIED MATERIALS & INTERFACES
(2022)
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, Physical
Chengke Chen, Dong Fan, Hui Xu, Meiyan Jiang, Xiao Li, Shaohua Lu, Changcheng Ke, Xiaojun Hu
Summary: Monoatomic tantalum is capable of transforming graphite to diamond under normal pressure, enabling the preparation of large-area diamond films with high mobility n-type conductivity. This discovery has significant implications for the fabrication of diamond-based electronic devices.
Article
Materials Science, Multidisciplinary
Chengke Chen, Zhi He, Wei-En Chen, Chien-Ray Yeh, Chii-Ruey Lin, Keh-Chyang Leou, I-Nan Lin, Xiaojun Hu
Summary: The PPT process has different effects on the structure evolution and EFE properties of HF-UNCD films and MP-UNCD films. In HF-UNCD films, CH4/N-2 PPT process can lead to the enlargement of diamond grains and the generation of stacking faults, resulting in a lower turn-on field. However, in MP-UNCD films, only isotropic growth occurs.
PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE
(2022)
Article
Materials Science, Ceramics
Dong Fan, Xin Zhong, Zhenzhong Zhang, Liping Huang, Yaran Niu, Lujie Wang, Qilian Li, Xuebin Zheng
Summary: With the increasing service temperature of aeroengines, the development of thermal/environmental barrier coatings (T/EBCs) has been considered to be a great challenge. In this study, high-entropy design was used to change the crystal structure of rare-earth monosilicates used for T/EBCs, and the performance changes before and after thermal aging were investigated. The results showed that the high-entropy coatings after thermal aging exhibited lower thermal conductivity, similar thermal expansion coefficient, and better toughness.
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
(2023)
Article
Chemistry, Physical
Sharath Kandambeth, Vinayak S. Kale, Dong Fan, Jeremy A. A. Bau, Prashant M. M. Bhatt, Sheng Zhou, Aleksander Shkurenko, Magnus Rueping, Guillaume Maurin, Osama Shekhah, Mohamed Eddaoudi
Summary: This work reports an innovative strategy for the synthesis of chemically robust metal-organic frameworks (MOFs) and their application as catalysts for the electrocatalytic oxygen evolution reaction (OER). The study demonstrates that bimetallic MOF systems with regulated metal ratios exhibit excellent catalytic activity and structural stability for OER.
ADVANCED ENERGY MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Chengke Chen, Yang Li, Difeng Guo, Changcheng Ke, Dong Fan, Shaohua Lu, Xiao Li, Meiyan Jiang, Xiaojun Hu
Summary: By adding monodispersed transition metals, graphite can spontaneously transform into diamond without any pressure, which provides a promising method for diamond synthesis. The study also establishes universal rules for predicting the role of certain elements in the phase transition.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Zhiguang Zhu, Congqiang Jiang, Chengke Chen, Shaohua Lu, Meiyan Jiang, Xiao Li, Xiaojun Hu
Summary: Researchers found that by annealing monodispersed Ta atoms deposited on pressed pure graphite substrate under ordinary pressure, graphite can be transformed into diamond. Prior to annealing, diamond grains were observed only among TaC particles. After annealing, diamond grains appeared not only among TaC particles, but also in the amorphous carbon region. The study provides an alternative method to prepare diamond from graphite under ordinary pressure, different from the conventional high pressure high temperature method.
Article
Engineering, Chemical
Dong Fan, Aydin Ozcan, Osama Shekhah, Rocio Semino, Mohamed Eddaoudi, Guillaume Maurin
Summary: Engineering structure defects at MOF surfaces can enhance the adhesion between MOF and polymer, accelerate gas transport, and improve the selectivity of membranes.
JOURNAL OF MEMBRANE SCIENCE LETTERS
(2022)
Article
Chemistry, Physical
Shaohua Lu, Kai Zhu, Dong Fan, Xiaojun Hu
Summary: This study identifies a previously unknown two-dimensional palladium carbide, named alpha-PdC, using the structure swarm intelligence algorithm. The proposed alpha-PdC monolayer exhibits high stability and desirable electrical conductivity, making it an intrinsic multifunctional electrocatalyst. It shows excellent catalytic performance with low overpotentials for the hydrogen evolution reaction, oxygen evolution reaction, and oxygen reduction reaction. This discovery has significant implications for energy conversion and storage.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)