Article
Chemistry, Physical
Xinghui Liu, Ruinian Hua, Jinhai Niu, Zhenyi Zhang, Jialiang Zhang
Summary: The photocatalytic activity of Titanium dioxide nanosheets (TiO2 NFs) can be enhanced by N-2 plasma treatment, leading to more oxygen vacancy and Ti3+ ions in the N-TiO2 NFs. The Ti3+ self-doped system formed by Ti3+ ions increases the light absorption range, resulting in a 14.85 times higher catalytic H-2 evolution rate in N-TiO2 NFs compared to pristine TiO2 NFs.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Materials Science, Multidisciplinary
Xiufei Hu, Ming Li, Yingnan Wang, Yan Peng, Gongbin Tang, Xiwei Wang, Bin Li, Yiqiu Yang, Mingsheng Xu, Xiangang Xu, Jisheng Han, Kuan Yew Cheong
Summary: We developed a new method of producing composite substrates by growing diamond films on a 4H-SiC substrate to enhance thermal management in GaN-based RF power devices. The morphology, grain orientation, and structure of the diamond films were characterized, and they exhibited uniform and compact properties without voids, gaps, graphite phase, or impurity peak. The thermal conductivity of the composite substrates was simulated and calculated, showing a significant increase compared to pure SiC substrate, and the coefficient of thermal expansion could be engineered by changing the SiC thickness.
Article
Environmental Sciences
Yang Zhou, Ruizhi Chu, Lulu Fan, Jianqiao Zhao, Weisong Li, Xiaofeng Jiang, Xianliang Meng, Yusai Li, Shi Yu, Yongzhou Wan
Summary: Thermal plasma activation of CH4-CO2 reforming is an efficient and clean technology for utilizing hydrocarbon resources and reducing greenhouse gases. This study investigates the equilibrium state and transformation mechanism of the reaction using experimental, thermodynamic, and kinetic analyses. The results show that the CO2 conversion rate and H2 selectivity decrease with increasing CO2/CH4 ratio, while the CH4 conversion rate and CO selectivity show the opposite trend. Excess CO2 promotes the partial oxidation of CH4, eliminating carbon deposition and achieving higher gas conversion without carbon deposition.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Materials Science, Coatings & Films
Qiang Lin, Sulin Chen, Zhe Ji, Zhewei Huang, Zhinan Zhang, Bin Shen
Summary: This study demonstrates the deposition of UNCD films can be achieved in CH4/H-2 chemistry without Ar, and the re-nucleation rate can be specifically regulated by adjusting gas pressure and carbon concentration. A novel kinetic growth model was established to interpret the UNCD growth mechanism with CH4/H-2 chemistry, and the atmospheric window for the deposition of UNCD films was obtained. The study provides insights into the UNCD growth mechanism without Ar content and simplifies the gas strategy for UNCD growth.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Physical
Victor Ralchenko, Vadim Sedov, Artem Martyanov, Valery Voronov, Sergey Savin, Andrey Khomich, Mikhail Shevchenko, Andrey Bolshakov
Summary: We report on the growth of novel microcrystalline diamond-germanium composite films on Si substrates using microwave plasma assisted chemical vapor deposition. The structure of the films strongly depends on the deposition temperature, with competing Ge grains and diamond crystallites at lower temperatures, and enhanced diamond growth at higher temperatures. The composite shows optical transmission for wavelengths above 10 mm and exhibits bright optical emission of GeV color centers at 601 nm. The effective coefficient of thermal expansion can be tuned by adjusting the Ge volume fraction, facilitating integration with semiconductor wafers.
Article
Chemistry, Multidisciplinary
Xiaozhong Chen, Zunrong Sheng, Sho Murata, Shungo Zen, Hyun-Ha Kim, Tomohiro Nozaki
Summary: Dry methane reforming was studied in a newly developed fluidized-bed dielectric barrier discharge reactor, showing significant promotion compared to a packed-bed DBD reactor. The extended surface area of powdered catalysts and their interaction with plasma-generated reactive species in the fluidized-bed reactor were found to be the main mechanisms for promoting DMR. Additionally, enhanced heat and mass transport, along with longer residence time, contributed greatly to the enhancement of DMR performance.
JOURNAL OF CO2 UTILIZATION
(2021)
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
Chemistry, Multidisciplinary
Rodrigo Leon-Guillen, Ana Luz Munoz-Rosas, Jesus A. Arenas-Alatorre, Juan Carlos Alonso-Huitron, Ana Laura Perez-Martinez, Arturo Rodriguez-Gomez
Summary: Silicon carbide (SiC) is a remarkable photonic material. The reproducible self-formation of silicon quantum dots (SiQDs) within SiC matrices has been achieved, which is beneficial for producing electroluminescent devices operating at high power, high temperatures, or high voltages. The introduction of SiQDs dramatically increases the photoluminescence-integrated intensity of SiC films, showing a normal distribution with positive skewness and well-defined intensity maxima in the blue region of the electromagnetic spectrum (439-465 nm), which is visible to the naked eye.
Article
Chemistry, Physical
Xiaohong Li, Minjun Lei, Zhiliang Jin
Summary: This study prepared graphdiyne (GDY) by mechanical ball milling and coupled it with CoS2 nanoparticles to form a heterojunction photocatalyst. The introduction of GDY improved the carrier migration and energy efficiency, resulting in enhanced hydrogen evolution activity.
JOURNAL OF CATALYSIS
(2023)
Article
Engineering, Electrical & Electronic
G. T. Chavan, S. T. Pawar, B. Y. Fugare, S. S. Kamble, P. C. Pingale, Yedluri Anil Kumar, A. Sikora, Abdullah A. Al-Kahtani, Chan-Wook Jeon
Summary: Indium-doped CdSe thin films were prepared using a chemical growth technique, which improved the surface structure and properties of CdSe. The integration of In3+ into CdSe resulted in a shift in the energy band gap, increased absorption, and enhanced refractive index and dielectric constants. The electrical conductivity was also modulated by indium doping.
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
(2023)
Article
Chemistry, Multidisciplinary
Yi Shen, Hong-Ping Ma, Lin Gu, Jie Zhang, Wei Huang, Jing-Tao Zhu, Qing-Chun Zhang
Summary: In this work, atomic level doping of Sn into Ga2O3 films was achieved using a plasma-enhanced atomic layer deposition method. The study investigated the effects of doping on the chemical state, microstructure, optical properties, energy band alignment, and electrical properties of the films. The results provide valuable insights for the design and application of Ga2O3 film-based transparent devices.
Article
Chemistry, Physical
William G. S. Leigh, Evan L. H. Thomas, Jerome A. Cuenca, Soumen Mandal, Oliver A. Williams
Summary: This study developed an optical model using spectroscopic ellipsometry (SE) to monitor and optimize the critical early stages of polycrystalline diamond growth in real-time.
Article
Materials Science, Coatings & Films
Won-Bum Lee, Hyun-Jun Jeong, Hye-Mi Kim, Jin-Seong Park
Summary: In this study, aluminum-indium oxide semiconductors were fabricated by plasma-enhanced atomic layer deposition, and the control of aluminum concentration and defect sites in the thin film was achieved by adjusting the number of indium oxide subcycles. Thin film transistors with excellent performance were demonstrated.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Chemistry, Physical
Xiaoyang Yi, Sibo Sun, Haizhen Wang, Zhiyong Gao, Wei Cai, Xin Zhang
Summary: The study found that proton irradiation had an influence on the microstructural characteristics, martensitic transformation behavior, and mechanical performance of NiTi thin films, introducing multiple-layer structures and new transformation behaviors. Additionally, the effects of irradiation on NiTi thin films were enhanced with increasing irradiation fluence.
Article
Materials Science, Multidisciplinary
Minseob Kim, Seong Ho Lee, Jinyeong Yu, Seho Cheon, Sujeong Byun, Chong Soo Lee, Taekyung Lee
Summary: This study investigated the microstructural kinetics induced by electropulsing treatment (EPT) of Ti-6Al-4V alloy and found that EPT enhances several aspects of microstructural evolution, leading to improved mechanical performance.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)