Article
Materials Science, Multidisciplinary
Ravi Teja Mittireddi, Nisha Hiralal Makani, Deepak G. Prajapati, Abhay Raj Singh Gautam, Rupak Banerjee, Emila Panda
Summary: This study focuses on quantifying the impact of microstructure on the functionality of titanium dioxide films caused by minor changes in the fabrication process. Thin titanium dioxide films are deposited using sputtering with variations in target composition and working environment. Various characterization techniques are employed to quantitatively analyze the phase, chemical constitution, composition, thickness, roughness, density, etc. of the films and their link to electronic structure, electrical, optical, and surface characteristics. The insights from this study can guide the experimental design for fabricating films with desired functionalities by considering the tolerance range.
MATERIALS CHARACTERIZATION
(2023)
Article
Nanoscience & Nanotechnology
Andris Sutka, Kaspars Malnieks, Martins Zubkins, Arturs Pludons, Anatolijs Sarakovskis, Osvalds Verners, Raivis Eglitis, Peter C. Sherrell
Summary: This study examines the tribvovoltic performance of TiO2 thin films in contact with metals of varying work functions. It is found that the current density is not strongly correlated with the work function of the contact metal but is strongly correlated with the contact area. The thermoelectric coefficients of different metals at the metal-semiconductor interface also show a clear correlation with the tribvovoltic current density.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Optics
Sahana Nagappa Moger, Pawan Kumar, Gowrish K. Rao, M. G. Mahesha
Summary: CdS films were deposited on glass substrates using thermal evaporation method at room temperature. The effect of air annealing on the structural, optical, and electrical properties of the films was investigated. It was found that annealing improved the film's structure and electrical properties, making it suitable for visible range photodetectors.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Jesse Daughtry, Abdulrahman S. Alotabi, Liam Howard-Fabretto, Gunther G. Andersson
Summary: The research aims to examine the properties required for producing thin films of TiO2 using RF plasma, with the ability to modify the films through heating to induce defects and change their characteristics. Different deposition regimes were studied to minimize unwanted contaminants and the resulting TiO2 films showed a lower cost alternative to single-crystal TiO2 with known elemental composition and modifiable properties.
NANOSCALE ADVANCES
(2021)
Article
Chemistry, Physical
A. J. Salvador, I. T. Neckel, I. L. Graff, D. H. Mosca
Summary: The chemical disorder in magnetic shape memory alloys has a significant impact on their properties. This study deposited Ni2MnGa thin films on flexible glass substrates using DC magnetron sputtering and investigated the short-range order/disorder through X-ray absorption measurements. The results reveal the persistence of local tetragonal distortions, decrease of anti-site disorder, and substitutions between Ni and Ga atoms with increasing annealing temperatures.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Environmental
Prapatsorn Kaewkam, Apichaya Kanchanapaetnukul, Janista Khamyan, Nattapon Phadmanee, Kun-Yi Andrew Lin, Krisana Kobwittaya, Sanya Sirivithayapakorn
Summary: The study investigated the effects of TiO2 phases and UV light on photodegradation of LDPE films, finding that using TiO2-900°C with UV-C light resulted in the highest degradation efficiency. Analysis of crystal structure and elemental composition provided insights into the degradation mechanism of LDPE films.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Chemistry, Physical
Katarzyna Plachete, Anna Kot, Joanna Banas-Gac, Marcin Zajac, Marcin Sikora, Marta Radecka, Katarzyna Zakrzewska
Summary: Titanium oxide thin films were deposited using rf magnetron sputtering, and their crystallographic structure, phase composition, morphology, and optical properties were extensively studied. It was found that the microstructure of the films changed with the O2 flow ratio, and promising photoanode materials for green hydrogen generation were identified.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Inorganic & Nuclear
Maria Isabel Mendoza Diaz, Andrea Balocchi, Kolade Oyekan, Kui Tan, William G. Vandenberghe, Alain Esteve, Carole Rossi
Summary: TiO2 thin films with a combination of anatase and rutile phases were prepared by sputter deposition. The post-annealing step at 200 degrees C resulted in a 5-fold increase in H-2 production. In-depth analysis revealed the significant role of intermediate states, OH- and Ti3+ defects, as well as ethanol-induced hole traps in the photocatalytic performance of the TiO2 films.
DALTON TRANSACTIONS
(2022)
Article
Chemistry, Multidisciplinary
F. Grigoriev, V. B. Sulimov, A. Tikhonravov
Summary: Increasing the flux of assisting ions can improve the density and refractive index of silicon dioxide films, while decreasing the concentration of point defects and stressed structural rings. Further increase in the flux of assisting ions has minor effects on the film properties.
Article
Chemistry, Physical
Nagmani, D. Pravarthana, A. Tyagi, T. C. Jagadale, W. Prellier, D. K. Aswal
Summary: A highly selective and sensitive hydrogen sulfide sensor based on nanocrystalline TiO2 thin film on a silicon substrate was developed, showing exceptional sensor response and stability at different H2S gas concentrations. The surface roughness and defects of the TiO2 film were found to play a significant role in achieving better selectivity and sensitivity properties for the sensor.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Minha Kim, Hongsub Jee, Jaehyeong Lee
Summary: In the field of printed electronics, a photo-sintering technique using intense pulsed light source has been developed to selectively heat thin films with large light absorption coefficients, achieving a lower electrical resistivity. A new system using a high-power UV-LED module offers advantages such as low power consumption and potential large-scale application.
Article
Materials Science, Multidisciplinary
Yazan Badour, Sylvain Danto, Mathieu Gonidec, Christine Labrugere, Matthew R. Suchomel, Gilles Philippot, Manuel Gaudon
Summary: By tuning the oxygen substoichiometry of WO3 nano-powders, the photochromic properties can be optimized. In addition, WO3-x thin films fabricated using the dip-coating method exhibit excellent UV photoresponse and photoelectric characteristics.
Article
Nanoscience & Nanotechnology
Diana Chaykina, Giorgio Colombi, Herman Schreuders, Bernard Dam
Summary: Rare-earth metal oxyhydride thin films exhibit photochromism, causing reversible darkening when exposed to high-energy light. In this study, samarium oxyhydrides were included in the range of known photochromic RE-oxyhydrides. The properties of the Sm-oxyhydride film, such as optical bandgap, lattice constant, photochromic contrast, and bleaching speed, were controlled by the deposition pressure during reactive magnetron sputtering of SmH1.9+delta and post-oxidation. The slower bleaching speeds in Sm oxyhydrides compared to other lanthanides are attributed to the stability of the Sm2+ state and the difficulty in oxidizing it back to the original RE3+ state.
Article
Chemistry, Physical
Divya Dixit, B. Ramachandran, M. Chitra, K. Madhuri, G. Mangamma
Summary: The photochromic performance of PLD-grown nanostructured MoO3 thin film was studied, showing a shift in Raman peak frequency with increasing LASER power due to coloration process. The Raman spectra characterized strong peaks at 819 and 994 cm-1, attributed to O-Mo6+-O and Mo6+-O bonds vibrations respectively, with the peak at 994 cm-1 associated with terminal oxygen stretching mode for orthorhombic MoO3. This study also revealed enhanced photochromic response of MoO3 nanostructures under LASER excitation, demonstrating a transition from Mo6+ to Mo5+ states and subsequent coloration.
APPLIED SURFACE SCIENCE
(2021)
Article
Materials Science, Multidisciplinary
M. Novakovic, M. Popovic, P. Noga, D. Vana, C. Ronning
Summary: This study investigates the effects of pure silver and silver/gold co-implanted TiN thin films on their optical properties, significantly reducing optical losses and approaching the optical performance of pure gold. This optical tuning of TiN opens up new possibilities for its implementation in plasmonic applications.
Article
Nanoscience & Nanotechnology
Xiaopeng Liu, Holly Andersen, Yinan Lu, Bo Wen, Ivan P. Parkin, Michael De Volder, Buddha Deka Boruah
Summary: The development of devices with dual solar energy-harvesting and storage functionalities has gained traction for off-grid power supply. In this study, a porous carbon coated on a zinc oxide-cadmium sulfide heterostructure was proposed as an energy efficient photocathode for photo-accelerated zinc ion capacitors (Photo-ZICs). The Photo-ZICs demonstrated efficient charge storage performance under illumination compared to dark conditions, along with stable charge storage capacities over long-term cycling.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Maria Anagnostopoulou, Areti Zindrou, Thomas Cottineau, Andreas Kafizas, Clement Marchal, Yiannis Deligiannakis, Valerie Keller, Konstantinos C. Christoforidis
Summary: This work reports the development of tunable organic/inorganic heterojunctions comprised of cobalt oxides (Co3O4) and modified carbon nitride (CN), targeting on optimizing their response under UV-visible irradiation. The study highlights the importance of MOF structures used as precursors in forming advanced materials and the stepwise functionalization of the individual parts in nanocomposites for the development of materials with superior activity.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Holly Andersen, Yinan Lu, Joanna Borowiec, Ivan P. Parkin, Michael De Volder, Buddha Deka Boruah
Summary: The development of photo-enhanced lithium-ion batteries, where exposing the electrodes to light results in higher capacities, higher rate performance or self-charging, has recently gained substantial traction. The challenge in these devices lies in the realisation of photo-electrodes with good optical and electrochemical properties. Herein, we propose copper-hexahydroxybenzene as the active photo-electrode material which both harvests light and stores energy. This material was mixed with reduced graphene oxide as a conductive additive and charge transfer medium to create photo-active electrodes. Under illumination, these electrodes show improved charge storage kinetics resulting in the photo-accelerated charging and discharging performance (i.e. specific capacities improvement from 107 mA h g(-1) to 126 mA h g(-1) at 200 mA g(-1) and 79 mA h g(-1) to 97 mA h g(-1) at 2000 mA g(-1) under 1 sun illumination as compared to dark).
Article
Chemistry, Multidisciplinary
Xuan Gao, Yuhang Dai, Chengyi Zhang, Yixuan Zhang, Wei Zong, Wei Zhang, Ruwei Chen, Jiexin Zhu, Xueying Hu, Mingyue Wang, Ruizhe Chen, Zijuan Du, Fei Guo, Haobo Dong, Yiyang Liu, Hongzhen He, Siyu Zhao, Fangjia Zhao, Jianwei Li, Ivan P. Parkin, Claire J. Carmalt, Guanjie He
Summary: The use of the isotope electrochemical effect (EEI) of water in Zn-ion batteries (ZIBs) electrolyte addresses the challenges of side reactions and gas production. The low diffusion and strong coordination of ions in D2O reduce the possibility of side reactions, resulting in a broader potential window, less pH change, and less zinc hydroxide sulfate (ZHS) generation during cycling. D2O also eliminates different ZHS phases caused by changes in bound water, leading to a stable electrode-electrolyte interface. Full cells with D2O-based electrolyte demonstrate stable cycling performance with high reversible efficiencies and wide voltage windows.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Multidisciplinary
Julie Jalila Kalmoni, Frances L. Heale, Christopher S. Blackman, Ivan P. Parkin, Claire J. Carmalt
Summary: Robust fluorine-free superhydrophobic films were successfully prepared using a mixture of fatty acids, SiO2 nanoparticles, and polydimethylsiloxane. The films exhibited a highly textured morphology, with a water contact angle of 162 +/- 2 degrees and a sliding angle of <5 degrees. The superhydrophobicity of the films remained intact even after exposure to UV light, heat treatment, multiple tape peeling cycles, and various organic solvents.
Article
Chemistry, Physical
Sanjayan Sathasivam, Sapna D. Ponja, Seonghyeok Park, Clara Sanchez-Perez, Christopher Blackman, Ivan P. Parkin, Claire J. Carmalt
Summary: Alternatives to tin-doped indium oxide transparent electrodes are required. Tungsten-doped SnO2 thin films with low resistivities and high electron mobilities were obtained using chemical vapor deposition. The tungsten dopant had minimal distortion to the SnO2 unit cell and resulted in crystallographic preferential orientation in the [200] direction. X-ray photoelectron spectroscopy analysis indicated that tungsten was present in the +5 state, minimizing ionized impurity scattering and achieving high electron mobilities. The tungsten-doped films had an optical band gap of 3.7 eV, making them transparent to visible light.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Mingyue Wang, Raul Quesada-Cabrera, Sanjayan Sathasivam, Matthew O. Blunt, Joanna Borowiec, Claire J. Carmalt
Summary: This study fabricated visible-light-activated iodide-doped BiOBr thin films using aerosol-assisted chemical vapor deposition. The optimized material with 2.7% iodide dopant exhibited the highest photocatalytic performance under 450 nm irradiation, making it an excellent candidate for the photodegradation of volatile organic pollutants.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Roxy Lee, Raul Quesada-Cabrera, Joe Willis, Asif Iqbal, Ivan P. P. Parkin, David O. O. Scanlon, Robert G. G. Palgrave
Summary: This study presents a method for quantifying crystallographic phases on a surface by fitting experimental photoemission spectra with density functional theory (DFT) models. The method was applied to map the anatase to rutile ratio across the surface of mixed-phase TiO2 thin films, and the results were correlated with photocatalytic activity measurements. The study demonstrates the potential of this method for large-scale functional and surface composition mapping in heterogeneous systems, and the unique insights provided by DFT-simulated spectra on the electronic structure origins of complex valence band spectral features.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Physical
Yuan Quan, Marcus H. N. YiO, Yuankai Li, Rupert J. Myers, Andreas Kafizas
Summary: In this study, the effect of Bi particle size in BiOI/Bi junctions on their photocatalytic function towards NO gas was investigated. The results showed that BiOI decorated with nano-sized Bi particles (BiOI/Bi NPs) displayed the highest photocatalytic activity, achieving NO and NOx conversion efficiencies of -33% and -11% under UVA light. In contrast, the BiOI microflowers decorated with micron-sized Bi particles (BiOI/Bi MPs) and pure BiOI samples showed lower activities. The enhanced performance of BiOI/Bi NPs was attributed to the interfacial contact between Bi and BiOI, promoting charge carrier separation and the formation of VO.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
(2023)
Article
Multidisciplinary Sciences
Sultan Ben-Jaber, Daniel Glass, Thomas Brick, Stefan A. Maier, Ivan P. Parkin, Emiliano Cortes, William J. Peveler, Raul Quesada-Cabrera
Summary: Photo-induced enhanced Raman spectroscopy (PIERS) is a highly sensitive surface-enhanced Raman spectroscopy (SERS) technique for detecting ultra-low concentrations of organic molecules. This study compares PIERS with Vo-induced SERS approaches to further confirm the role of Vo in PIERS and presents a proposed mechanism and discussion on using PIERS as a probe to explore photocatalytic materials.
PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-MATHEMATICAL PHYSICAL AND ENGINEERING SCIENCES
(2023)
Article
Nanoscience & Nanotechnology
Jiatong Huo, Cesar De Leon Reyes III, Julie Jalila Kalmoni, Seonghyeok Park, Gi Byoung Hwang, Sanjayan Sathasivam, Claire J. Carmalt
Summary: This study demonstrates the fabrication of fluorocarbon-free superhydrophobic coatings using a simple deposition method. The coatings consist of poly(butyl methacrylate) and nanostructured functionalized silica. Instrument measurements confirm the successful formation of the composite and its excellent contact and sliding angles, as well as moderate surface roughness. This research presents an environmentally friendly and efficient method for preparing PBMA-based superhydrophobic coatings.
ACS APPLIED NANO MATERIALS
(2023)
Article
Chemistry, Physical
Anna A. Wilson, Thomas P. Shalvey, Andreas Kafizas, Asim Mumtaz, James R. Durrant
Summary: This study investigates the charge carrier dynamics in SrTiO3 under applied bias and reveals the presence of Ti3+ defect states, which limit electron extraction and photocurrent. However, a long lifetime of photogenerated holes in SrTiO3 is observed even without applied bias, which is important for overcoming slow kinetics and hole accumulation in water oxidation reactions.
SUSTAINABLE ENERGY & FUELS
(2023)
Article
Chemistry, Multidisciplinary
Zijuan Du, Ang Qiao, Hemin Zhou, Zhencai Li, Wessel M. W. Winters, Jiexin Zhu, Guanjie He, Ivan P. Parkin, Haizheng Tao, Yuanzheng Yue
Summary: This study prepared high-density amorphous phases of bimetallic zeolitic imidazolate frameworks and measured their heat capacity to determine the glass transition temperature. The results showed a nonlinear effect of the molar ratio R on the glass transition temperature, indicating an increase in configurational freedom as R increases. The study also found a close correlation between configurational freedom and network connectivity.
CHEMICAL COMMUNICATIONS
(2023)
Proceedings Paper
Engineering, Civil
Yifeng Zhang, Haobo Dong, Tianlei Wang, Guanjie He, Ivan P. Parkin, Frederic Cegla
Summary: This study demonstrates the sensitivity of guided ultrasonic waves to dendrite formation in batteries. By measuring the cyclical variations of wave velocity and attenuation, dendrite growth can be quantitatively tracked.
EUROPEAN WORKSHOP ON STRUCTURAL HEALTH MONITORING (EWSHM 2022), VOL 3
(2023)
Article
Chemistry, Physical
Sergey Yu. Ketkov, Sheng-Yuan Tzeng, Elena A. Rychagova, Anton N. Lukoyanov, Wen-Bih Tzeng
Summary: Metallocenes, including methylcobaltocene, play important roles in various fields of chemistry. The ionization energy and vibrational structure of (Cp ')(Cp)Co can be influenced by introducing methyl substituents. The mass-analyzed threshold ionization spectrum and DFT calculations provide accurate information about the properties and transformations of (Cp ')(Cp)Co.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Review
Chemistry, Physical
Qifeng Mu, Jian Hu
Summary: Polymer mechanochemistry has experienced a renaissance due to the rapid development of mechanophores and principles governing mechanochemical transduction or material strengthening. It has not only provided fundamental guidelines for converting mechanical energy into chemical output, but also found applications in engineering and smart devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Da Hye Yang, Francesco Ricci, Fredrik L. Nordstrom, Na Li
Summary: Through systematic evaluation of the oiling-out behavior of procaine, we identified both stable and metastable liquid-liquid phase separation, and established phase diagrams to assist in rational selection of crystallization strategies.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Vikki Anand Varma, Simmie Jaglan, Mohd Yasir Khan, Sujin B. Babu
Summary: Designing engineering structures like nanocages, shells, and containers through self-assembly of colloids is a challenging problem. This work proposes a simple model for the subunit, which leads to the formation of monodispersed spherical cages or containers. The model with only one control parameter can be used to design cages with the desired radius.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Hainan Jiang, Yaolong He, Xiaolin Li, Zhiyao Jin, Huijie Yu, Dawei Li
Summary: The cycling lifespan and coulombic efficiency of lithium-ion batteries are crucial for high C-rate applications. The Li-ion concentration plays a crucial role in determining the mechanical integrity and structural stability of electrodes. This study focuses on graphite as the working electrode and establishes an experimental system to investigate the mechanical properties of composite graphite electrode at different C-rates. Considering the effect of Li-ion concentration in stress analysis is found to be significant.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Zhiye Wang, Yunchuan Li, Mingjun Sun
Summary: This study investigates the influence of intramolecular pi-pi interactions on the electronic transport capabilities of molecules. By designing and analyzing three pi-conjugated molecules, the researchers observe that different pi-conjugated structures have varying effects on electron transport. The findings provide a theoretical foundation for designing single-molecule electronic devices with multiple electron channels based on intramolecular pi-pi interactions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Yuandong Xu, Haoyang Feng, Chaoyang Dong, Yuqing Yang, Meng Zhou, Yajun Wei, Hui Guo, Yaqing Wei, Jishan Su, Yingying Ben, Xia Zhang
Summary: Hollow MoS2 cubes and spheres were successfully synthesized using a one-step hydrothermal method with the hard template method. The hollow MoS2 cubes exhibited higher specific capacitance and energy density compared to the hollow MoS2 spheres. The symmetrical supercapacitors assembled with these hollow structures showed good performance and high capacity retention after multiple cycles. These findings suggest that controlling the pore structure and surface characteristics of MoS2 is crucial for enhancing its electrochemical properties.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Ainhoa Oliden-Sanchez, Rebeca Sola-Llano, Joaquin Perez-Pariente, Luis Gomez-Hortiguela, Virginia Martinez-Martinez
Summary: The combination of photoactive molecules and inorganic structures is important for the development of advanced materials in optics. In this study, bulky dyes were successfully encapsulated in a zeolitic framework, resulting in emission throughout the visible spectrum.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Miaomiao Zhang, Cunyuan Pei, Qiqi Xiang, Lintao Liu, Zhongxu Dai, Huijuan Ma, Shibing Ni
Summary: The design of a solid electrolyte interphase (SEI) plays a crucial role in improving the electrochemical performance of anode materials. In this study, lithium difluoro(oxalate)borate (LiDFOB) is used as an electrolyte additive to form a protective SEI film on Li3VO4 (LVO) anodes. The addition of LiDFOB results in a dense, uniform, stable, and LiF-richer SEI, which enhances the Li-ion storage kinetics. The generated SEI also prevents further decomposition of the electrolyte and maintains the morphology of LVO anodes during charge/discharge processes. This work demonstrates the effectiveness of LiDFOB as a multi-functional additive for LiPF6 electrolytes and provides insights into SEI construction for high-performance LVO anodes.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
B. V. Andryushechkin, T. V. Pavlova, V. M. Shevlyuga
Summary: The atomic structure of the Ag(111)-p(4 x 4)-O phase was reexamined and two phases with the same periodicity were discovered. It was demonstrated that the accepted Ag6 model is incompatible with high-resolution oxygen-sensitive STM images.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
S. L. Romo-Avila, D. Marquez-Ruiz, R. A. Guirado-Lopez
Summary: In this study, we used density functional theory (DFT) calculations to investigate the interaction between model graphene oxide (GO) nanostructures and chlorine monoxide ClO. We aimed to understand the role of this highly oxidizing species in breaking C-C bonds and forming significant holes on GO sheets. Our results showed that C-C bonds in a single graphene oxide sheet can be broken through a simple mechanism involving the dissociation of two chemically attached ClO molecules. The formation of carbonyl groups and holes on the GO surface was also observed. This study provides important insights into the degradation of carbon nanotubes and the stability of GO during the myeloperoxidase (MPO) catalytic cycle.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Alberto Garcia-Fernandez, Birgit Kammlander, Stefania Riva, Hakan Rensmo, Ute B. Cappel
Summary: In this study, the X-ray stability of five different lead halide perovskite compositions (MAPbI3, MAPbCl3, MAPbBr3, FAPbBr3, CsPbBr3) was investigated using photoelectron spectroscopy. Different degradation mechanisms and resistance to X-ray were observed depending on the crystal composition. Overall, perovskite compositions based on the MA+ cation were found to be less stable than those based on FA+ or Cs+. Metallic lead formation was most easily observed in the chloride perovskite, followed by bromide, and very little in MAPbI3. Multiple degradation processes were identified for the bromide compositions, including ion migration, formation of volatile and solid products, as well as metallic lead. CsBr was formed as a solid degradation product on the surface of CsPbBr3.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Timofei Rostilov, Vadim Ziborov, Alexander Dolgoborodov, Mikhail Kuskov
Summary: The shock-loading behavior of nanomaterials is investigated in this study. It is found that shock compaction waves exhibit a distinct two-step structure, with the formation of faster precursor waves that travel ahead of the main compaction waves. The complexity of the shock Hugoniot curve of the tested nanomaterial is described, and the effect of initial porosity on the compressed states is demonstrated.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Sergey S. Nikitin, Alexander D. Koryakov, Elizaveta A. Antipinskaya, Alexey A. Markov, Mikhail V. Patrakeev
Summary: The stability of La1/3Sr2/3Fe1-xMnxO3-delta, a perovskite-type oxide, under reducing conditions is dependent on the manganese content. Increasing the manganese content leads to a decrease in stability. The behavior of iron and manganese in the oxide shows distinct differences, which can be attributed to the difference in the enthalpy of oxidation reactions. Additionally, the change in the La/Sr ratio affects the concentration of iron and manganese ions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)
Article
Chemistry, Physical
Mosayeb Naseri, Shirin Amirian, Mehrdad Faraji, Mohammad Abdur Rashid, Maicon Pierre Lourenco, Venkataraman Thangadurai, D. R. Salahub
Summary: Inspired by the successful transfer of freestanding ultrathin films of SrTiO3 and BiFeO3, this study assessed the structural stability and investigated the electronic, optical, and thermoelectric properties of a group of two-dimensional perovskite-type materials called perovskenes. The findings revealed that these materials are wide bandgap semiconductors with potential application in UV shielding. Moreover, they exhibit better electrical and thermal conductivity at high temperatures, enabling efficient power generation in thermoelectric devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2024)