Article
Crystallography
Leszek Ruchomski, Jan Ozimek, Karolina Siedliska, Konstantinos N. Raftopoulos, Krzysztof Pielichowski
Summary: The chemical vapour deposition technique was used to deposit TiO2 on mesoporous silica (SBA-15) using Titanium(IV) tetraisopropoxide (TTIP) and titanium(IV) tetrabutoxide (TNBT) as sources. Structural investigations using XRD, FTIR, and Raman spectroscopy revealed a thin layer of amorphous TiO2 deposited on the SBA-15 surface. However, TNBT did not result in Ti ions deposition. The thermal stability of the Ti/SBA-15 composites remained unchanged compared to pristine silica.
Article
Materials Science, Coatings & Films
Christian Micallef, Cheng-Wei Chiu, Yuri Zhuk, Adrianus Indrat Aria
Summary: This study explored the electropolishing behavior of hard W/WC coatings, investigating optimal parameters for achieving a mirror-like surface finish and coating thickness change. Comparing the effects of different electrolyte concentrations, it was found that 5wt% NaOH was more stable than 3wt% and resulted in a better overall surface finish.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Materials Science, Multidisciplinary
E. Vetrivendan, Rongali Hareesh, S. Ningshen
Summary: This study investigates the effects of chemical vapor deposition (pyrolysis) temperature on the properties of pyrolytic graphite (PyG). The results show that higher pyrolysis temperature leads to better density, structure, and preferred orientation of PyG, but also increases the presence of defects.
Article
Chemistry, Physical
C. X. Han, J. Q. Zhi, Z. Zeng, Y. S. Wang, B. Zhou, J. Gao, Y. X. Wu, Z. Y. He, X. M. Wang, S. W. Yu
Summary: Researchers have successfully grown diamond films on high entropy alloys (HEAs) substrates using chemical vapour deposition, which are facilitated by the high carbon solubility and lower nucleation energy barrier of HEAs. Continuous diamond films with high nucleation density and rapid growth have been achieved within 30 minutes, and the corrosion resistance of the specimens in saltwater has been improved due to the continuous diamond film.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Rumyana Yankova, Ivaylo Tankov
Summary: In this study, the crystal structure, intermolecular interactions, and chemical reactivity of a new ionic liquid (C3H5N2)(HSeO4) were evaluated using various techniques. The molecular geometry of the compound was optimized using density functional theory. The crystal structure was found to have a monoclinic system with a hydrogen bond stabilizing the (C3H5N2)(HSeO4) structure. The analysis revealed that the compound exhibited high chemical reactivity due to intensive electron density distribution.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Chemistry, Physical
Lachlan M. Oberg, Marietta Batzer, Alastair Stacey, Marcus W. Doherty
Summary: This study investigates the catalytic effect of surface-embedded nitrogen on diamond growth, revealing that nitrogen can promote nucleation of new diamond layers. A new model and mechanism for nitrogen overgrowth are proposed, shedding light on the role of nitrogen in enhancing diamond growth.
Article
Chemistry, Physical
Eric Navarrete, Frank Guell, Paulina R. Martinez-Alanis, Eduard Llobet
Summary: Different thicknesses of Au films were used in the growth of ZnO nanowires, with the 6 nm thick layers showing the most stable and repeatable gas sensing properties. Despite ZnO nanowires grown using the thickest Au layers reaching the highest responses under dry conditions, those grown using the thinnest Au film were more resilient at detecting NO2 in the presence of ambient moisture. The gas sensing results were discussed in light of defects and Au impurities in the ZnO nanowires, as revealed by characterization techniques such as X-ray diffraction, scanning electron microscopy, X-ray photoelectron spectroscopy, and photoluminescence spectroscopy.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Anusheela Das, Leighton O. Jones, Yanna Chen, Devika Choudhury, Denis T. Keane, Jeffrey W. Elam, George C. Schatz, Michael J. Bedzyk
Summary: Supported molybdenum oxide (MoOx) plays an important role in catalytic transformations. A detailed analysis of the catalyst under redox conditions using X-ray photoelectron spectroscopy and atomic density maps reveals the redox-driven dynamics of this complex catalytic structure.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Inorganic & Nuclear
Zhi-Cheng Wang, Kulatheepan Thanabalasingam, Jan P. Scheifers, Alenna Streeter, Gregory T. McCandless, Jonathan Gaudet, Craig M. Brown, Carlo U. Segre, Julia Y. Chan, Fazel Tafti
Summary: The crystal structure and magnetic properties of a new copper tellurite sulfate compound were analyzed, suggesting it as a promising alternative to layered perovskites for future experiments aiming to tune the Mott insulating ground state into superconducting or spin liquid states.
INORGANIC CHEMISTRY
(2021)
Article
Engineering, Electrical & Electronic
P. R. Jubu, F. K. Yam, O. S. Obaseki, Yushamdan Yusof
Summary: Ga2O3/glass films were successfully synthesized by CVD in the temperature range of 850-1000 degrees Celsius without substrate deformation. Increasing deposition temperature led to higher crystalline quality, thicker films, higher Ga content, and lower O content.
MATERIALS SCIENCE IN SEMICONDUCTOR PROCESSING
(2021)
Article
Chemistry, Physical
Yun Ki Kim, Keun-Young Shin
Summary: This study presents a concise method to fabricate PPY on flexible graphene substrate, investigates the influence of initiators on pyrrole polymerization, and explores the effects of morphological changes and doping concentrations of PPY on capacitive behaviors. The assistance of dopamine enhances the uniformity of PPY layers and improves the supercapacitor performance, demonstrating the potential for wearable energy-storage devices application.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Xueyin Bai, Shisheng Li, Susobhan Das, Luojun Du, Yunyun Dai, Lide Yao, Ramesh Raju, Mingde Du, Harri Lipsanen, Zhipei Sun
Summary: The study demonstrates the successful synthesis of high-quality vertical bilayer MoS2/WS2 heterostructures with a grain size of up to 60 µm through a single-step CVD process. Unlike normal pyramid structures, an anti-pyramid MoS2/WS2 structure was synthesized, providing new insights into the synthesis and applications of two-dimensional heterostructures.
Article
Chemistry, Analytical
Mostafa A. Atia, Petr Smejkal, Vipul Gupta, Paul R. Haddad, Michael C. Breadmore
Summary: This study demonstrates the superior performance of chemical vapour deposition (CVD) coating for suppressing the electroosmotic flow (EOF) compared to liquid phase deposition (LPD) in capillary electrophoresis (CE). By adjusting the modification method and surface chemistry, the capillary can be easily and effectively modified, and the stability of the coating meets the long-term monitoring requirements for water chemistry.
ANALYTICA CHIMICA ACTA
(2023)
Article
Materials Science, Ceramics
Waleed E. Mahmoud
Summary: In this study, RuxV1-xO2/graphene hybrid nanocomposites were successfully synthesized using a one-step laser scribe approach, showing promising electrochemical properties for supercapacitors and energy storage devices. The hybrid electrode exhibited excellent capacitance retention at high current densities, indicating a great potential for practical applications in energy storage devices.
CERAMICS INTERNATIONAL
(2021)
Review
Chemistry, Physical
Luca Seravalli, Matteo Bosi
Summary: Two-dimensional materials like graphene, transition metal dichalcogenides, and boron nitride show great potential for novel applications in sensing and electronic devices; among various methods, chemical vapour deposition is a promising technique for obtaining 2D layers of different materials. Control and reproducibility of synthesis are crucial for driving the development of 2D materials.
Article
Crystallography
Jianzheng Hu, Long Yan, Ning Zhou, Yao Chen, Xiaoni Yang, Lianqiao Yang, Shiping Guo
Summary: The effect and mechanism of carrier gas velocity, V/III ratio, and carrier gas velocity match on the growth rate of AlN were investigated in this study. The results showed that the growth rate of AlN initially increased with hydrogen flow rate, reached saturation, and then decreased monotonically. The turning point value depended on the equipment and process. By increasing the MO VM, the growth rate of AlN could be improved, but the uniformity deteriorated due to turbulence and loss of uniform boundary layer. High quality AlN films were successfully grown on nano-patterned sapphire substrates with improved crystalline quality and atomic smooth surfaces.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Tingting Ma, Yang Li, Kangning Sun, Qinglin Cheng, Sen Li
Summary: This study investigates the melting process and nucleation behavior of sodium crystals using molecular dynamics simulation. The results show good agreement between simulated and experimental values for the melting temperature, density, and radial distribution function of sodium. The diffusion coefficient of liquid sodium increases linearly with temperature, and the homogeneous nucleation rate of melting in superheated sodium crystal exponentially increases with temperature. The findings provide theoretical support for applications involving heat and mass transfer in sodium-related systems.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Hisato Nishii, Shintarou Iida, Akira Yamasaki, Takumi Ikenoue, Masao Miyake, Toshiya Doi, Tetsuji Hirato
Summary: Epitaxial V2O3 films were fabricated on sapphire substrates using mist chemical vapor deposition (mist CVD) method, eliminating the need for high vacuum conditions. The films can be grown on sapphire substrates even under atmospheric pressure, with the optimal growth temperature at 823 K. The films grown at 823 K exhibit a metal-insulator transition at approximately 155 K. The film on C-plane sapphire exhibits a lower transition temperature compared to those on R- and A-plane sapphire substrates.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Jani Jesenovec, Kevin Zawilski, Peter Alison, Stephan J. Meschter, Sambit K. Saha, Andrew J. Sepelak, Peter G. Schunemann
Summary: In this study, NiSb needles were successfully formed in InSb by manipulating the growth rate and adding NiSb. These needle structures in InSb can be used to tune the magnetoresistance of devices. Additionally, undoped InSb crystals demonstrated good infrared transmission at low growth rates.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
D. Joseph Daniel, P. Karuppasamy, H. J. Kim
Summary: The 2-amino 4-methyl pyridinium oxalate (2A4MPO) compound was synthesized and its crystal structure, functional groups, thermal stability, electrical properties, and third-order nonlinear optical properties were studied. The results demonstrate that the synthesized crystal has good structural integrity, thermal stability, and potential for third-order nonlinear optical applications.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
C. W. Lan
Summary: The past two decades have witnessed a significant transformation in solar silicon crystal growth, especially in the competition between multi-crystalline silicon (Multi-Si) and mono-crystalline silicon (Mono-Si). The demand for this crucial material has exponentially surged, with silicon solar panels capturing over 95% of the global PV market share. The advancements in crystal growth technology during this period have set historical benchmarks, with the market share shifting from high-performance multi-crystalline silicon (HPM-Si) to CZ silicon.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Peiyao Hao, Lili Zheng, Hui Zhang
Summary: A novel design of argon gas tube for removing impurities during silicon ingot growth was developed, and numerical simulations showed that it can effectively extract SiO.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Geetika Sahu, Chanchal Chakraborty, Subhadeep Roy, Souri Banerjee
Summary: This article discusses the novel fractal nature of hydrothermally synthesized MoS2 QDs. By adjusting the reaction time, the study found that the average size of QDs increases and then decreases with longer reaction times. STEM images indicate that shorter reaction times lead to sheet formation, while extended reaction times cause sheets to fragment into QDs.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Pengjian Lu, Wei Huang, Junjun Wang, Haitao Yang, Shiyue Guo, Bin Li, Ting Wang, Chitengfei Zhang, Rong Tu, Song Zhang
Summary: A systematic study on the tetramethylsilane-hydorgen (TMS-H-2) system for the deposition of pure single-crystal SiC by high-temperature chemical vapor deposition (HTCVD) method is conducted. The study investigates the effect of temperature, pressure, and H-2:TMS ratio on the deposition conditions and provides a theoretical basis and guidance for improving the quality and cost of industrial production of single-crystal SiC.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Xinyu Jiang, Liangliang Liu, Yanqing Liu, Yan Wang, Zhaoping Hou
Summary: Investigation on the preparation of anisometric templated textured high entropy or multi-element doped ferroelectric ceramics was conducted using A-site disordered niobate microcrystals. The effects of process parameters on the morphology and chemical composition were studied, and the photocatalytic properties of the microcrystals were evaluated.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Mobashsara Tabassum, Md. Ashraful Alam, Sabrina Mostofa, Raton Kumar Bishwas, Debasish Sarkar, Shirin Akter Jahan
Summary: In this study, high crystallinity copper nanoparticles were synthesized by altering the reaction medium at low temperatures. The results show that changing the reaction medium can reduce the surface energy of precursors and promote the formation of highly crystalline copper nanoparticles.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Ivan Bodnar, Vitaly V. Khoroshko, Veronika A. Yashchuk, Valery F. Gremenok, Mohsin Kazi, Mayeen U. Khandaker, Tatiana I. Zubar, Daria I. Tishkevich, Alex Trukhanov, Sergei Trukhanov
Summary: This work presents the production of single crystals of Cu2ZnGeSe4, a semiconducting quaternary compound, using a gas chemical method with iodine as a transporter. The phase state, crystal structure, and lattice constants of the synthesized samples were refined and determined. The band gap of Cu2ZnGeSe4 was calculated using transmission spectrum and it was found that the band gap increases by 12% with decreasing temperature in the range of 20-300 K.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Timur Malin, Igor Osinnykh, Vladimir Mansurov, Dmitriy Protasov, Sergey Ponomarev, Denis Milakhin, Konstantin Zhuravlev
Summary: The effect of growth temperature on the buffer leakage currents of GaN-on-Si layers was investigated. It was found that higher growth temperature results in lower leakage currents. The defects in GaN layers grown at different temperatures were studied using photoluminescence technique, and a correlation between leakage currents, structural perfection, and donor concentration in GaN-on-Si layers was established. It was also observed that reduced growth temperature leads to the formation of inversion domains.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Thi-Hoai-Thu Nguyen, Jyh-Chen Chen
Summary: The effect of heater power control on heat, flow, and oxygen transport for CCz crystal growth was studied. Shorter upper side heater design could improve crystal quality and growth, but with higher power consumption.
JOURNAL OF CRYSTAL GROWTH
(2024)
Article
Crystallography
Peter Rudolph
Summary: This article presents an overview of selected contributions to the development of crystal growth technology by the Laudise Prize awardee 2023. It discusses various aspects such as shaped crystal growth, the correlation between melt structure and crystal quality, control of intrinsic defects and inclusions, prevention of dislocation cell patterns, and melt growth experiments under a travelling magnetic field.
JOURNAL OF CRYSTAL GROWTH
(2024)