Article
Chemistry, Physical
Yunil Cho, James Huang, Zichen Zhang, Kesong Wang, Ping-che Lee, Chanyoung Kim, Keith Wong, Srinivas Nemani, Ellie Yieh, Andrew C. Kummel
Summary: In this study, the inherent selective pulsed chemical vapor deposition (CVD) of aluminum oxide on Si and SiO2 was investigated, with preference to SiCOH. Two different reagents, aluminum tri sec-butoxide (ATSB) and trimethylaluminum (TMA), were tested for pulsed CVD processes. The results showed that using ATSB alone could selectively deposit aluminum oxide at a sample temperature of 300 degrees C, with a thickness of about 4 nm on Si and SiO2. By adding pulses of TMA during ATSB pulses, higher selectivity was achieved with a thickness of about 12 nm and 14 nm on Si and SiO2 at 330 degrees C.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Physical
Batuhan Bal, Aligul Buyukaksoy
Summary: The study focuses on using yttria doped bismuth oxide ceramics as electrolyte supports and applying zirconia coatings to prevent reduction upon contact with hydrogen. However, the reaction between Zr source and YDB substrate as well as the choice of polymerization extent play crucial roles in crack formation and film conductivity.
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
(2021)
Review
Materials Science, Ceramics
L. Piperno, A. Vannozzi, G. Sotgiu, G. Celentano
Summary: Chemical solution deposition of CeO2-based buffer layers is commonly used for producing coated conductors, although achieving the necessary characteristics of biaxial texture, flatness, and chemical inertia can be challenging. This review explores the theoretical background of nucleation and epitaxial growth, discusses common issues, and summarizes relevant results using surface roughness as a key parameter for evaluating buffer layer quality.
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
(2021)
Article
Materials Science, Ceramics
Martina Angermann, Georg Jakopic, Christine Prietl, Thomas Griesser, Klaus Reichmann, Marco Deluca
Summary: In this study, RuO2 thin films were synthesized using water and acetic acid as solvents. The microstructure, phase purity, electrical and optical properties, as well as thermal stability of the films were characterized. The films showed metallic behavior with low resistivity and high optical absorption.
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
(2023)
Article
Materials Science, Multidisciplinary
Yanhao Dong, Yimeng Huang, Dong Ding, Wei Wu, Xiahui Yao, Ju Li
Summary: This study uses first-principles calculations to illustrate the chemical nature and local structural features of hole states in oxidized YSZ, identifying three types of hole states. The implications of these findings on various experimental observations are discussed, shedding light on the understanding of electronic conductivity and hole carriers in YSZ.
Article
Chemistry, Physical
Jinghan Yuan, Yoshimasa Amano, Motoi Machida
Summary: The mesoporous activated carbon derived from moso biomass was modified to efficiently remove aqueous phase nitrate ions, showing excellent adsorption capacity and rate. The optimal modified activated carbon exhibited rapid adsorption equilibrium within 8 minutes, with a high nitrate adsorption capacity at pH 3, as analyzed using pseudo-first-order and pseudo-second-order models.
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
(2021)
Article
Chemistry, Physical
Xu Yang, Shisheng Li, Naoki Ikeda, Yoshiki Sakuma
Summary: A newly developed oxide scale sublimation chemical vapor deposition (OSSCVD) technique for 2D MoS2 growth is reported, allowing stable growth by controlling the supply of MoO3. Using Dragontrail glass as a catalytic substrate enables the growth of large single-crystalline MoS2 domains.
Article
Nanoscience & Nanotechnology
Iwan Zimmermann, Marion Provost, Salim Mejaouri, Marc Al Atem, Alexandre Blaizot, Aurelien Duchatelet, Stephane Collin, Jean Rousset
Summary: In this study, industrially relevant deposition techniques are developed for the fabrication of perovskite photovoltaic cells. The use of chemical bath deposition for tin oxide deposition and slot-die coating for perovskite layer allows for the growth of high-quality and uniform perovskite layers, resulting in improved power conversion efficiencies.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Inorganic & Nuclear
Sugiarto, Jun Shinogi, Masahiro Sadakane
Summary: Through 1H NMR spectroscopy analysis, we identified three distinct Cp*Ir-containing tungsten oxide clusters formed in aqueous mixtures of [(Cp*IrCl)2(mu-Cl)2] and Na2WO4 with varying molar ratios. These species were isolated as Na4[(Cp*Ir)2(mu-OH)3]2[(Cp*Ir)2H2W8O30], [(Cp*Ir)2(mu-OH)3]2[(Cp*Ir)2{Cp*Ir(OH2)}2H2W8O30], and [(Cp*Ir)2{Cp*Ir(OH2)}2{Cp*Ir(OH2)2}2H2W8O30](NO3)2. The results indicate that the octatungstate [H2W8O30]10- anion is the main polyoxotungstate species in the presence of {Cp*Ir}2+ cations, which can bind up to six {Cp*Ir}2+ cations on its surfaces. Moreover, the coordination environment of {Cp*Ir}2+ can be altered by coordinating with pyridine.
INORGANIC CHEMISTRY
(2023)
Article
Crystallography
Izabela Stojanoska, Brigita Kmet, Hana Ursic, Danjela Kuscer
Summary: Gallium-doped ZnO (GZO) thin films were prepared by spin coating technique and used as transparent electrodes. Thermal analysis confirmed the decomposition of organic components and formation of ZnO at 450°C. The thin films were polycrystalline with a smooth surface, and the sheet resistance varied over time depending on annealing conditions.
Article
Chemistry, Inorganic & Nuclear
Clement Lausecker, Bassem Salem, Xavier Baillin, Odette Chaix-Pluchery, Herve Roussel, Sebastien Labau, Bernard Pelissier, Estelle Appert, Vincent Consonni
Summary: The controlled incorporation of copper into ZnO nanowires using chemical bath deposition is explored, highlighting the formation mechanisms and competitive adsorption of Cu(II) and Zn(II) ions on the top facets of the ZnO nanowires. The study provides insights into the physicochemical processes and speciation of Cu and Zn ions during the CBD process, revealing the significance of both thermodynamic simulations and chemical analyses in understanding the incorporation of dopants.
INORGANIC CHEMISTRY
(2021)
Review
Materials Science, Multidisciplinary
Benjamin Weitkamp Lamm, David Joseph Mitchell
Summary: This article discusses the mechanisms of deposition for various zirconium compounds, including metallic zirconium, ZrC, ZrN, ZrO2, ZrB2, and zirconium silicides. It compares them to the deposition mechanisms of titanium systems when direct research is lacking. The discussion includes both inorganic and organometallic deposition systems, and suggests studies on metallic zirconium deposition using zirconium halides and hydrogen, as well as in situ analysis techniques like FTIR spectroscopy or XPS to improve understanding of vapor deposition mechanisms.
Article
Chemistry, Physical
Vitor Bonamigo Moreira, Anna Puiggali-Jou, Emilio Jimenez-Pique, Carlos Aleman, Alvaro Meneguzzi, Elaine Armelin
Summary: This study investigates the influence of the substrate on the formation of zirconium oxide monolayer, showing that the nanoscale dimensions of the ZrO2 film are affected by the substrate nature and roughness. The mechanism of Zr-EAD depends on the potential applied and on the substrate composition, while conversion coating is uniquely dependent on the adsorption reaction time. In AA2024 substrates, zirconium oxide nanofilms were more homogenous compared to pure Al grade due to the high content of Cu alloying element present in the grain boundaries.
Article
Chemistry, Physical
Zachary Jeckell, Dhruval Patel, Andrew Herschberg, Tag Choi, David Barlaz, Lucia Bonova, Ivan Shchelkanov, Brian Jurczyk, David Ruzic
Summary: This study demonstrates the barrier coating and adhesion promoting properties of silica-based coatings deposited using an atmospheric pressure plasma torch, showing their potential application in lightweight manufacturing, especially in water protection. The films showed significant improvement in shear stress compared to controls and maintained strong shear strength even after exposure to water soak, showcasing their capabilities as a water barrier.
SURFACES AND INTERFACES
(2021)
Article
Physics, Fluids & Plasmas
Riho Endoh, Shuhei Nogami, Yoshimitsu Hishinuma, Takumi Chikada
Summary: The study focuses on reducing hydrogen isotope permeation and corrosion of structural materials by preparing yttria-stabilized zirconia (YSZ) coatings. A 4 mol%-Y2O3-containing YSZ coating showed significantly lower deuterium permeation flux and maintained high performance through thermal cycle tests.
Article
Chemistry, Physical
Bryan A. Long, Daniel J. Rodriguez, Chris Y. Lau, Madeline Schultz, Scott L. Anderson
JOURNAL OF PHYSICAL CHEMISTRY C
(2020)
Article
Chemistry, Applied
Alexander Edgar, Justine Yang, Manuel Chavez, Michelle Yang, Dali Yang
JOURNAL OF ENERGETIC MATERIALS
(2020)
Article
Chemistry, Multidisciplinary
Bryan A. Long, Chris Y. Lau, Daniel J. Rodriguez, Susanna An Tang, Scott L. Anderson
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2020)
Article
Chemistry, Physical
Daniel J. Rodriguez, Chris Y. Lau, Bryan A. Long, Susanna An Tang, Abigail M. Friese, Scott L. Anderson
Summary: The kinetics of O-2 oxidation for individual graphite and graphene platelet nanoparticles were studied at different temperatures and oxygen partial pressures. The initial oxidation efficiency peaked in the 1200-1500 K range and decreased as temperature increased above 2000 K. Variations in oxidation rates and efficiencies were attributed to differences in the nanoparticles' surface structures.
Article
Chemistry, Applied
Camille Hing Wong, Alexander Steven Edgar, Dali Yang
Summary: This study utilized LC-QTOF mass spectrometry to investigate degradation products of eutectic bis(2,2-dinitropropyl) acetal/formal nitroplasticizer. By analyzing method properties and MS/MS results, important relationships between degradation products, baseline, and aged materials were revealed. Insights offered by this newly developed methodology identified both previously proposed fragments and new degradation products, shedding light on the complexity of NP degradation chemistry.
PROPELLANTS EXPLOSIVES PYROTECHNICS
(2021)
Article
Chemistry, Multidisciplinary
Daniel J. Rodriguez, Chris Y. Lau, Abigail M. Friese, Alexandre Magasinski, Gleb Yushin, Scott L. Anderson
Summary: This study measured the oxidation and sublimation kinetics of individual nanoparticles from different feedstocks using single-nanoparticle mass spectrometry. The results showed that oxidation is highly sensitive to surface structure, while sublimation rates are influenced by temperature. All types of carbon nanoparticles eventually became inert to oxygen, but the evolution and time dependence varied for nanoparticles from different feedstocks.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2022)
Article
Chemistry, Applied
Alexander S. Edgar, Camille H. Wong, Kitmin Chen, David A. Langlois, Dali Yang
Summary: The presence of DNPOH in aged NP as a degradation product through hydrolysis has been identified for the first time using LC-QTOF analysis. It is shown that water can stabilize NP against hydrolysis and reduce acidity by slowing HONO decomposition.
PROPELLANTS EXPLOSIVES PYROTECHNICS
(2022)
Article
Chemistry, Physical
Daniel J. Rodriguez, Chris Y. Lau, Abigail M. Friese, Bryan A. Long, Scott L. Anderson
Summary: The sublimation and O2 etching kinetics of individual silicon nanoparticles were studied using a mass spectrometry technique. The results showed that the etching efficiency varied with time and temperature, and the optical properties of the nanoparticles changed during the etching process.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
Article
Chemistry, Multidisciplinary
Kitmin Chen, Alexander S. Edgar, Camille H. Wong, Dali Yang
Summary: This study investigated the analysis of N-phenyl-beta-naphthylamine (PBNA) using liquid chromatography tandem quadrupole time-of-flight (LC-QTOF) and successfully identified and quantified the nitrated products of PBNA. The instrumental parameters were optimized to obtain accurate results, and the fragmentation pathways were rationalized and validated using reference standards.
Article
Chemistry, Multidisciplinary
Kitmin Chen, Alexander S. Edgar, Julie Jung, Joel D. Kress, Camille H. Wong, Dali Yang
Summary: In this study, PBNA nitrated derivatives were thoroughly characterized using liquid chromatography quadrupole time-of-flight mass spectrometry. The propagation of PBNA nitration was found to depend on temperature and acidity, providing a reliable means of determining the extent of NP degradation.
Article
Chemistry, Physical
Chris Y. Lau, Daniel J. Rodriguez, Abigail M. Friese, Scott L. Anderson
Summary: We measured the absolute kinetics for reactions of C2H2 with a series of approximately 60 individual carbon nanoparticles from different feedstocks. The growth rates of the nanoparticles varied significantly depending on the feedstock. Diamond nanoparticles passivated against C2H2 addition above a certain temperature, and the reactivity of carbon nano-onions was found to depend on the presence of non-onion-structure surface carbon. Graphitic and carbon black nanoparticles exhibited three distinct growth modes correlated with their initial mass. The efficiencies of C2H2 addition and O-2 etching were strongly correlated, but this correlation changed as the nanoparticles passivated.
JOURNAL OF CHEMICAL PHYSICS
(2023)
Article
Spectroscopy
Steven G. Young, James Valdez, Michelle Espy, Alex Edgar, Jack Brett, Michael T. Pettes, Clay Mathers, Matthew Barbour, Brian M. Patterson
Summary: Two metal artifacts, a crossbow quarrel and a reliquary pendant, were analyzed using various X-ray techniques as well as infrared spectroscopy and electron microscopy. The metal material was found to be copper, while the gems in the pendant were composed of manganese and calcium.
X-RAY SPECTROMETRY
(2023)
Article
Chemistry, Multidisciplinary
Kitmin Chen, Alexander S. Edgar, Zheng-Hua Li, Oana C. Marina, Dali Yang
Summary: During the thermal aging of nitroplasticizer (NP), the formation of nitrous acid (HONO) leads to the decomposition of HONO into reactive nitro-oxide species and nitric acid (HNO3), causing cascaded deterioration of NP and resulting in acidic constituents. It is important to develop an analytical method to measure the concentrations of HONO, HNO3, and related acidic species accurately. By using liquid-liquid extraction and ion chromatography (IC), we established a fast and unambiguous method to determine the concentrations of HONO, HNO3, acetic/formic acids, and oxalic acid in aged NP samples. Our study demonstrates that the aging temperature is crucial in accelerating the formation and decomposition of HONO, thereby increasing the acidity of aged NP samples and accelerating the hydrolysis of NP.
