Article
Chemistry, Inorganic & Nuclear
Ga Yeon Lee, Seungmin Yeo, Chan-Mi Cho, Seung Hoon Oh, Hyeonbin Park, Bo Keun Park, Seung Uk Son, Taeyong Eom, Taek-Mo Chung
Summary: This paper reports the synthesis of three novel titanium complexes containing amidoxime ligands for the fabrication of titanium nitride (TiN) thin films via atomic layer deposition (ALD). The ligands were successfully synthesized and used to produce the complexes, and the liquid complex 5 was used as a precursor for the synthesis of TiN thin films. The deposition of TiN thin films was achieved with self-limiting growth and resulted in smooth and well-oriented microstructure.
INORGANIC CHEMISTRY
(2023)
Article
Nanoscience & Nanotechnology
Robin R. Petit, Jin Li, Babs Van de Voorde, Sandra Van Vlierberghe, Philippe F. Smet, Christophe Detavernier
Summary: Inorganic barriers grown by ALD can solve stability issues caused by foreign species permeating into polymer thin films. The infiltration of ALD species into polymers can also modify their properties. Results show that the deposition temperature and the location of functional groups in the polymer chain have the strongest influence on the infiltration behavior.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Coatings & Films
Georg C. Gruber, Stefan Wurster, Megan J. Cordill, Robert Franz
Summary: The suitability of refractory high entropy metal sublattice nitride (HEAN) thin films as diffusion barrier between Cu and Si was evaluated. The study found that the stability of metal-nitrogen bonds in the HEAN layer plays a crucial role in its barrier performance.
SURFACE & COATINGS TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Mohammad Amin Gharavi, Arnaud le Febvrier, Jun Lu, Grzegorz Greczynski, Bjorn Alling, Rickard Armiento, Per Eklund
Summary: (Ti-0.5, Mg-0.5)N thin films were synthesized by reactive dc magnetron sputtering, exhibiting a rock-salt cubic structure and a LiTiO2-type superstructure. The films have an electrical resistivity of 150 mΩ*cm and a Seebeck coefficient of -25 μV/K. High temperature annealing in a nitrogen atmosphere leads to the formation of the cubic superstructure. Density functional theory calculations show a 0.07 eV direct bandgap for the LiTiO2-type TiMgN2 structure.
Article
Chemistry, Physical
Jan Krajczewski, Aleksandra Michalowska, Radim Ctvrtlik, Libor Nozka, Jan Tomastik, Lukas Vaclavek, Sylwia Turczyniak-Surdacka, Krzyszof Bienskowski, Renata Solarska
Summary: This study compares the SERS activity of TiN and Au nano/micro-structures with the same morphology for the first time. Si pyramids were formed and coated with Au and TiN layers of different thicknesses. The platforms exhibited plasmonic properties in the visible range and were effective SERS platforms. The thickest layers of both Au and TiN showed the highest enhancement factor (EF), and even low concentrations of tartrazine could be detected.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Inorganic & Nuclear
Da-Ae Park, Ji Young Son, Ji Min Seo, Bo Keun Park
Summary: Four Mo(II) and W(II) compounds were synthesized and characterized. The molecular structures of two compounds were almost identical with a pseudo-octahedral geometry. The thermogravimetric analysis showed higher residues for these compounds compared to the expected values, but they were volatile and sublimed at relatively low temperatures. The tungsten compound exhibited good durability under high temperature conditions.
INORGANIC CHEMISTRY
(2023)
Article
Energy & Fuels
N. Akcay, V Gremenok, V. A. Ivanov, E. Zaretskaya, S. Ozcelik
Summary: The effect of a thin Al2O3 barrier layer on the performance of CZTS films was investigated. The crystalline qualities of the films did not change significantly with the addition of the Al2O3 layer. Raman spectra and XPS analysis revealed the formation of secondary phases and compounds on the film surfaces. The presence of the Al2O3 layer resulted in changes in surface morphology and Na diffusion rate.
Article
Materials Science, Coatings & Films
Byunguk Kim, Sangmin Lee, Taesung Kang, Sunghoon Kim, Sangman Koo, Hyeongtag Jeon
Summary: Pure MoNx thin films with excellent crystallinity and low impurity concentration can be obtained using a newly synthesized liquid Mo precursor in an ALD super-cycle process. These films exhibit relatively low resistivity values and excellent diffusion barrier characteristics, making them suitable for use as barrier layers at high temperatures.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2022)
Article
Materials Science, Multidisciplinary
Sang Young Lee, Jerry Mack, Hae Young Kim, Sung-Hoon Jung, Somilkumar J. Rathi, Niloy Mukherjee
Summary: ALD-processed TiSiN thin film is effective as a diffusion barrier, reducing boron out-diffusion from the poly-Si layer and fluorine into the substrate. Si doping promotes amorphous deposition of TiSiN, preventing potential diffusion paths. The ultra-thin TiSiN films maintain continuity and conformality, meeting the requirements of a diffusion barrier.
Article
Chemistry, Physical
Oran Lori, Alisa Kozhushner, Hilah C. Honig, Lior Elbaz
Summary: In this study, a high surface area, porous titanium-based ceramic compound was synthesized via a modified urea glass method and used as an electrocatalyst support in fuel cell cathodes for oxygen reduction reaction. The ceramic-based system showed superior ORR activity, fuel cell performance, and durability compared to a commonly used commercial Pt/C catalyst. Among all the ceramic-based samples studied, the one synthesized in a ratio of 1:10 (Ti:urea) exhibited the highest overall performance in a fuel cell configuration.
JOURNAL OF POWER SOURCES
(2023)
Article
Materials Science, Coatings & Films
Chanwon Jung, Seokhwi Song, Hyunwoo Park, Youngjoon Kim, Eun Jong Lee, Sung Gwon Lee, Hyeongtag Jeon
Summary: The study investigated amorphous SiCN thin films deposited by remote plasma atomic layer deposition using different deposition temperatures and plasma powers. It was found that the carbon content and dielectric constant of the film can be controlled by varying these parameters, impacting the chemical composition and wet etch rate.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2021)
Article
Materials Science, Multidisciplinary
Jyoti Yadav, M. D. Anoop, Rini Singh, Nisha Yadav, N. Srinivasa Rao, Fouran Singh, Ankur Jain, Takayuki Ichikawa, Kamlendra Awasthi, Manoj Kumar
Summary: In this study, precise and controlled tuning of strain in BiSbTe3 thin films was achieved by Fe ion implantation. The influence of Fe ions on the electronic band structure of BiSbTe3 and the tunability of Fermi level were confirmed by changes in resistivity. The observed reversible tuning of the Fermi level suggests potential device control applications.
Review
Physics, Applied
Teresa de los Arcos, Peter Awakowicz, Marc Boeke, Nils Boysen, Ralf Peter Brinkmann, Rainer Dahlmann, Anjana Devi, Denis Eremin, Jonas Franke, Tobias Gergs, Jonathan Jenderny, Efe Kemaneci, Thomas D. Kuehne, Simon Kusmierz, Thomas Mussenbrock, Jens Rubner, Jan Trieschmann, Matthias Wessling, Xiaofan Xie, David Zanders, Frederik Zysk, Guido Grundmeier
Summary: This feature article discusses the correlation between plasma-enhanced chemical vapor deposition and plasma-enhanced atomic layer deposition thin film structures and their barrier or membrane properties. By controlling deposition parameters and substrate selection, effective diffusion barriers or films with selective permeability can be obtained. Understanding the growth and analysis of pore size distribution and pore surface chemistry of the film is crucial for understanding the transport properties of small molecules.
PLASMA PROCESSES AND POLYMERS
(2023)
Article
Chemistry, Physical
Min-Ji Ha, Hyunchang Kim, Jeong-Hun Choi, Miso Kim, Woo-Hee Kim, Tae Joo Park, Bonggeun Shong, Ji-Hoon Ahn
Summary: As memory devices become smaller, the increase in metal line resistance is a critical issue. This study proposes a new ultralow-resistivity MoCx thin film as a candidate for metal lines, which was successfully deposited using a halogen-free precursor.
CHEMISTRY OF MATERIALS
(2022)
Article
Electrochemistry
Rajagopal Peri, Muthuraaman Bhagavathiachari, Subramanian Balasubramanian
Summary: Transition-metal carbides and nitrides have the potential to fulfill energy needs in conversion and storage devices. However, their synthesis procedures can be complicated and their practical applications can be imbalanced. This study developed a compact, multipurpose electrode system using reactive DC magnetron sputtering. Fourteen different combinations of thin-film electrodes were prepared and investigated for their electrochemical properties. The results showed that all thin films demonstrated energy storage characteristics, with vanadium-based films showing noteworthy energy conversion efficiencies.
ELECTROCHIMICA ACTA
(2022)
Article
Chemistry, Physical
Magali S. Ferrandon, Carly Byron, Gokhan Celik, Yuying Zhang, Chaoying Ni, Jennifer Sloppy, Rachel A. McCormick, Karl Booksh, Andrew Teplyakov, Massimiliano Delferro
Summary: In this study, a large number of different combinations of catalysts were synthesized using a high-throughput method. Evaluation revealed that the type of oxide support has a significant impact on the activity and stability of the catalysts, and the optimal effects of different metal promoters on various metal oxide supports varied.
APPLIED CATALYSIS A-GENERAL
(2022)
Article
Chemistry, Physical
Danae A. Chipoco Haro, Eri Muramoto, Robert J. Madix, Juan Carlos F. Rodriguez-Reyes
Summary: Alkynes are nucleophiles that can easily undergo dehydrogenation on a gold catalyst, forming acetylide species and coupling products. However, the strong attachment of catalytic intermediates to the surface can lead to parallel decomposition pathways and carbon poisoning of the catalyst. Alkynes can displace species known for facile dehydrogenation on gold, including adsorbed alkoxy and alcohols of similar molecular weight.
Article
Chemistry, Multidisciplinary
Shixiang Zuo, Haiguang Zhang, Xiazhang Li, Chaoya Han, Chao Yao, Chaoying Ni
Summary: In this study, attapulgite (ATP) mineral was modified with iron and doped with CeF3 nanoparticles to form a CeF3:Yb3+, Er3+/Fe-ATP heterostructure for photocatalytic nitrogen fixation. The results showed that the heterostructure had dual active sites, allowing for enhanced adsorption and activation of N-2 molecules. The CeF3 doping facilitated the conversion of near-infrared light to ultraviolet and visible light, while the rational Z-scheme heterostructure improved the separation of charge carriers and redox potentials.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Energy & Fuels
Meijun Lu, Kurt R. Mikeska, Chaoying Ni, Yong Zhao, Feibiao Chen, Xianqing Xie, Yawen Xu, Changgen Zhang
Summary: This study presents industrial-grade n-type bifacial tunnel oxide passivated contacts c-Si solar cells with cost-effective silver pastes, achieving a median solar cell efficiency of 22.21% and a bifaciality efficiency factor of 82.9%. The front-side paste is designed for contacting p+ boron-diffused Si emitter surfaces, while the rear-side paste is designed for contacting n+ phosphorous-doped surfaces. The electrical data suggests that the efficiency is limited by the front-side contact, and a microstructural model indicates that electrical contact in both front-side and rear-side regions occurs through residual interfacial films.
IEEE JOURNAL OF PHOTOVOLTAICS
(2022)
Article
Archaeology
Angelica Isa-Adaniya, Anibal Alviz-Meza, Juan Carlos F. Rodriguez-Reyes
Summary: Funding for culture and heritage projects is usually limited, and even more so during times of crisis. The Research Center for Heritage Conservation in Lima, Peru, has adopted the value-chain model to evaluate conservation projects and promote sustainable practices. Projects must meet the criteria of well-documented problem, clear hypothesis or objective, realistic methodology, and practical and beneficial results. The application of the value-chain model leads to tangible outcomes and facilitates self-sustaining conservation research.
STUDIES IN CONSERVATION
(2022)
Article
Chemistry, Physical
Danae A. Chipoco Haro, Juan Carlos F. Rodriguez-Reyes
Summary: This study reports the enhanced acidity of ethanethiol and benzenethiol on an oxygen-covered gold surface, which is caused by the strong affinity of sulfur towards gold. The study also highlights the impact of sulfur-gold affinity on catalytic activity.
Article
Chemistry, Multidisciplinary
Luis Palomino, Danae A. Chipoco Haro, Miguel Gakiya-Teruya, Feng Zhou, Adolfo La Rosa-Toro, Vijay Krishna, Juan Carlos F. Rodriguez-Reyes
Summary: Novel silver nanoparticles were synthesized using polyhydroxy fullerene as a reducing and capping agent, showing smaller size, enhanced antibacterial activity, and improved electrocatalytic properties compared to conventional citrate-synthesized nanoparticles.
Review
Materials Science, Multidisciplinary
Chunyan Zhang, Ratnakar D. D. Vispute, Kun Fu, Chaoying Ni
Summary: This review focuses on the thermal properties of chemical vapor deposited diamond thin films and their importance in thermal management and other applications. Diamond offers unique opportunities in thermal management due to its exceptional properties, such as high thermal conductivity and radiation hardness.
JOURNAL OF MATERIALS SCIENCE
(2023)
Article
Chemistry, Physical
Danae A. Chipoco Haro, Layla M. Gonzales Matushita, Maynard J. Kong, Juan Carlos F. Rodriguez-Reyes
Summary: This study compares the interaction of aromatic compounds with gold surfaces and finds that the introduction of functional groups significantly increases the adsorption energy, affecting the pathways for decomposition and poisoning reactions. Furthermore, the molecular structure of the aromatic molecule determines the extent to which further dehydrogenation, coupling, or surface decomposition reactions occur.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Physical
A. M. Gabay, Chaoya Han, Chaoying Ni, G. C. Hadjipanayis
Summary: Recently, the lack of knowledge about the high-temperature phase equilibria in the Sm-Fe-Ti system has been brought to attention due to new attempts in developing high-performance rare-earth-lean permanent magnets based on the Sm(Fe,Ti)12 compound. Experimental investigation has revealed inaccuracies in the currently accepted phase relations, leading to a revision of the Fe-rich corner of the Sm-Fe-Ti phase diagram. The study also found extended Ti ranges for the Sm(Fe,Ti)12 and Sm3(Fe,Ti)29 phases, and identified the equilibrium between the Sm2(Fe,Ti)17 and TiFe2 phases. The revised phase diagram is essential for the manufacturing of Sm (Fe,Ti)12-based permanent magnets via liquid-phase sintering.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Chemistry, Physical
Qiuyue Liu, Yuxiang Yang, Hongming Yuan, Anbang Dai, Chaoying Ni
Summary: Diatomite@Bi2WO6 photocatalyst was successfully prepared using a co-precipitation method, and characterized by various techniques. The photocatalytic performance of diatomite@Bi2WO6 on the degradation of MXC under visible light was evaluated. The results showed that diatomite@Bi2WO6 exhibited much higher MXC removal rate and followed first-order kinetics compared to pure Bi2WO6. The potential reaction mechanism and the stability and recyclability of diatomite@Bi2WO6 were also investigated.
JOURNAL OF MOLECULAR STRUCTURE
(2023)
Article
Materials Science, Multidisciplinary
A. M. Gabay, Chaoya Han, Chaoying Ni, G. C. Hadjipanayis
Summary: This study discovered a rare-earth-free compound, the off-stoichiometric TiFe2.5 Laves phase, which exhibits modest intrinsic hard magnetic properties. This compound, with a hexagonal C14 crystal structure, showed room-temperature ferromagnetism and a weak magnetic anisotropy. Its Curie temperature is 422 K, saturation magnetization is 55.3 Am2/kg, and magnetic hardness parameter is 0.97, making it suitable for the development into permanent magnets.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Chunyan Zhang, Kaiyue Deng, Xiazhang Li, Kun Kelvin Fu, Chaoying Ni
Summary: Thermal transportation in a preferreddirection is important. Carbon nanotubes have great potential in heat dissipation devices. This study successfully printed vertically aligned multiwalled carbon nanotube (MWCNT)-filled polylactic acid (PLA) nanocomposites with improved through-plane thermal conductivity. The nanocomposites showed superior performance compared to the matrix polymer in infrared thermal imaging. This work opens up possibilities for 3D-printed carbon filler-reinforced polymer composites in thermal-related applications.
ACS APPLIED NANO MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Leyan Wei, Yuying Zhang, Chunyan Zhang, Chao Yao, Chaoying Ni, Xiazhang Li
Summary: This study prepared a nanostructured photocatalyst by assembling perovskite (LaFeO3) on hydrothermal carbonation carbon (HTCC) via a facile microwave hydrothermal method, which was employed to reduce nitrate to ammonia. The nanostructured photocatalyst exhibited a large specific surface area and abundant surface functional groups, promoting nitrate adsorption. The p-n heterojunction formed between HTCC and LaFeO3 improved the photocatalytic activity by facilitating the separation of photogenerated electron holes. At the optimized mass ratios of pomegranate peel to Fe/La salt, the LaFeO3/HTCC photocatalyst achieved a highest nitrate removal of 94.6% and an ammonia selectivity of 88.7% under visible light irradiation. This work provides a potential approach for the photocatalytic synthesis of ammonia from residual nitrate pollutants.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Rongrong Gao, Yuying Zhang, Chaoya Han, Haoguan Gui, Chao Yao, Chaoying Ni, Xiazhang Li
Summary: In this study, a solar-driven catalysis system was developed using natural minerals and biomass waste to couple photocatalytic nitrogen reduction with biomass oxidation, achieving the concept of converting trash to treasure. A nanocomposite material consisting of modified attapulgite and hydrothermal carbon was synthesized, demonstrating remarkable photocatalytic nitrogen fixation capability coupled with chemical conversion under visible light.