Article
Energy & Fuels
Jicheng Zhou, Jing Huang, Jia Liao, Yan Guo, Zengchao Zhao, Huiling Liang
Summary: A coupled multi-physics field model based on the COMSOL Multiphysics platform was developed in this paper to simulate the deposition of SiNx:H thin films by LF-PECVD. Through optimizing process parameters, the deposition rate and uniformity were significantly improved, providing a reference for solving the problems caused by the increased size of tubular LF-PECVD equipment.
Article
Energy & Fuels
Kening Yao, Xiao Zhang, Boxiong Shen, Qiqi Shi, Shuhao Li, Feng Shen
Summary: This study aims to design an efficient adsorbent for high-efficiency removal of elemental mercury (Hg0) from coal-fired power plant emissions. By co-implanting porous TiO2 with inorganic-organic dual functional sites (-SH and MnOx), the 2SH-MnOx/TiO2 adsorbent achieved a Hg0 removal efficiency of 90% at 175 degrees C and a high gas hourly space velocity (GHSV) of 120,000 h-1. The co-existence of -SH and MnOx was found to promote Hg0 adsorption and enhance the transfer of electrons from Hg0 to the adsorbent surface.
Article
Chemistry, Multidisciplinary
Irina Parkhomenko, Liudmila Vlasukova, Fadei Komarov, Nataliya Kovalchuk, Sergey Demidovich, Ainur Zhussupbekova, Kuanysh Zhussupbekov, Igor V. Shvets, Oleg Milchanin, Dmitry Zhigulin, Ivan Romanov
Summary: Silicon nitride, silicon oxide, and silicon oxynitride thin films were deposited on Si substrate using inductively coupled plasma chemical vapor deposition and annealed in Ar environment at 1100℃ for 3 minutes. The composition and structural properties of the films were investigated, and it was found that annealing led to thickness decrease and structural transformation. Nanocrystalline phases of Si and Si3N4 were observed in the annealed silicon nitride film. The calculated optical parameters were shown to reflect the structural peculiarities of the as-deposited and annealed films.
Article
Materials Science, Multidisciplinary
Yang Li, Jingjun Xu, Jingjing Li, Yueming Li, Ke Ma, Wenting Wang, Xintao Zhang, Yi Zhang, Meishuan Li
Summary: The Cr2AlC transition layer was used to improve the oxidation resistance of the conventional NiCrAlY coating, and the long-term cyclic oxidation at 1000 degrees C showed that the Cr2AlC transition layer decomposed to Cr7C3 after annealing and further transformed to the thermodynamically more stable continuous Cr23C6 during subsequent oxidation. The continuous Cr23C6 effectively blocked diffusion between the NiCrAlY coating and the substrate, and the Cr2AlC transition layer also supplied additional Al for the NiCrAlY coating, greatly extending its service life. Furthermore, the thermal matching of Cr2AlC, Cr23C6, and Cr7C3 with the substrate and coating prevented coating spallation during cyclic oxidation.
Article
Nanoscience & Nanotechnology
Zhichen Guan, Kun Huo, Wei Qian, Zhibao Li, Ruifang Chen, Fengze Dai, Shikun Zou, Yinqun Hua, Jie Cai
Summary: In this study, laser shock peening (LSP) combined with low-temperature annealing (LTA) was used to manipulate the microstructures of Ti6Al4V, resulting in an optimal combination of strength and plasticity. LSP treatment induced plastic deformation and grain refinement, forming non-equilibrium grain boundaries (GBs). LTA treatment decreased dislocation density and facilitated element diffusion, leading to the formation of GBs with low excess energy and increased microstructural stability. The combined post-treatment of LSP and LTA resulted in Ti6Al4V with high tensile strength (994 MPa) and excellent elongation (17.4%).
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
(2023)
Article
Nanoscience & Nanotechnology
Chen-Hsuan Lu, Kuang-Ming Shang, Shi-Ri Lee, Chyi-Ming Leu, Yu-Chong Tai, Nai-Chang Yeh
Summary: A low-temperature plasma-enhanced chemical vapor deposition (PECVD) method is used to grow nanocrystalline multilayer graphene on silver, achieving surface passivation of silver. The graphene improves electrode stability and surface plasmon resonance in organic light-emitting diodes and biosensing. Furthermore, the multilayer graphene provides long-term protection of the underlying silver from oxidation.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Dorota Kubacka, Martin Weiser, Erdmann Spiecker
Summary: A novel approach using rapid thermal annealing and advanced electron microscopy was used to investigate the differences in early stages of high-temperature oxidation of Ni- and Co-base superalloys at 900 degrees C. STEM-EDX results showed the distinct roles of the gamma and gamma' phase during initial oxidation, and differences in Al2O3 formation were directly linked to changes in partitioning behavior and defect types introduced during oxidation, depending on the base element. Explanations for the inferior oxidation resistance of gamma'-strengthened Co-base superalloys were proposed.
Article
Materials Science, Multidisciplinary
Na Li, Di Li, Zhen Zhen, Rujing Zhang, Rende Mu, Zhenhua Xu, Limin He
Summary: Temperature is a crucial factor in the synthesis of graphene by chemical vapor deposition. This study investigates the nucleation and growth of graphene at different temperatures using plasma-enhanced chemical vapor deposition. The results show that graphene nucleation and growth vary significantly in different temperature zones, with different growth forms observed in different temperature regions. The study proposes models to explain the nucleation and growth of graphene in these temperature zones.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Chen-Hsuan Lu, Kuang-Ming Shang, Shi-Ri Lee, Yu-Chong Tai, Nai-Chang Yeh
Summary: Gold, as a common electrode material, is prone to corrosion. However, this study demonstrates that low-temperature plasma-enhanced chemical vapor deposition (PECVD) can be used to grow graphene on gold surfaces, providing effective anticorrosion protection. The graphene-covered gold surface remains intact after an acceleration soaking test, while the bare gold surface degrades under the same conditions. Therefore, the application of PECVD-grown graphene layer can prolong the efficacy and reliability of gold electrode-based biosensors.
ACS APPLIED NANO MATERIALS
(2022)
Article
Electrochemistry
Shuli Wang, Peixuan Xu, Jingqi Tian, Zong Liu, Ligang Feng
Summary: This study successfully demonstrated phase structure tuning of graphene supported Ni-NiO nanoparticles system to enhance urea oxidation performance. By optimizing the annealing temperature, the sample obtained at 450 degrees Celsius exhibited the highest catalytic activity and stability.
ELECTROCHIMICA ACTA
(2021)
Article
Materials Science, Multidisciplinary
Xuchen Jin, Peihao Ye, Hongrui Ji, Zhuanxia Suo, Boxin Wei, Xuewen Li, Wenbin Fang
Summary: In this study, a TiAl alloy with high Nb content was prepared through powder metallurgy, and its oxidation resistance at different temperatures was investigated. The mechanism and dynamics of high-temperature oxidation resistance were discussed based on the morphology and microstructure evolution of the oxide skin.
INTERNATIONAL JOURNAL OF MINERALS METALLURGY AND MATERIALS
(2022)
Article
Chemistry, Analytical
Miao Shi, Bridget A. Bergquist, Anwen Zhou, Yaqiu Zhao, Ruoyu Sun, Jiubin Chen, Wang Zheng
Summary: The efficiency of cold vapor generation (CVG) method for sample introduction in mercury (Hg) isotope analysis and its impact on Hg isotope analysis have been investigated in this study. The efficiency of Hg CVG can be affected by the sample uptake rate, sample matrix, and the design of the gas-liquid separator (GLS). Matrix separation, optimal GLS design, and tuning the sample uptake rate are crucial for obtaining high accuracy and precision in Hg isotope analysis.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2023)
Article
Materials Science, Multidisciplinary
Bibo Li, Yanning Liu, Ying Chen, Nan Li, Xiaolong Zhao, Jikang Li, Maoqiu Wang
Summary: This study investigated the effect of batch-annealing temperature on the oxidation of 22MnB5 steel during austenitizing. Decreasing the batch-annealing temperature from 690 to 680 °C resulted in a decrease in surface roughness, reducing the oxide layer thickness during subsequent austenitizing without significant impact on mechanical properties in the cold-rolled and quenched state.
Article
Materials Science, Multidisciplinary
Harsh Gupta, Santanu Ghosh, Saif A. Khan, Himanshu Srivastava, Arvind Srivastava, Pankaj Srivastava
Summary: The study investigated the effect of stoichiometry on a-SiNx:H thin films irradiated by 100 MeV Au8+ ions, revealing changes in refractive index, hydrogen evolution, composition, photoluminescence quenching, and ion track formation through ellipsometry, UV-Vis study, ERDA, RBS, and X-TEM. Results were interpreted within the framework of the Thermal spike mechanism of ion-solid interaction.
CURRENT APPLIED PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Salam Surjit Singh, Biraj Shougaijam, Mir Waqas Alam, Naorem Khelchand Singh
Summary: In this study, a thin Cu2O layer was fabricated on p-type silicon substrates using the E-beam evaporation method without catalyst. The fabricated CuO sample was annealed at different temperatures. The structural and morphological analysis of the samples were examined using XRD and SEM. The results showed the phase transition of CuO and the formation of Cu2O in the as-deposited sample.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
