Article
Chemistry, Multidisciplinary
Maura Malinska
Summary: Crystallization conditions were screened for producing crystal structures of p-tert-butylcalix[6]arene (TBC6) with different conformations, revealing molecular recognition and self-assembly between TBC6 and pyridine leading to various complexes. The crystal structure can be tuned by changing temperature and supersaturation conditions, with the ability to recrystallize as new complexes under thermodynamic conditions. Energy framework analysis was used to study the hierarchies of various interactional motifs and their topologies in the TBC6 complexes.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Chemistry, Multidisciplinary
Aleksandra Kieliszek, Maura Malinska
Summary: The study of the conformations of p-tert-butylcalix[8]-arene (TBC8) revealed the significant influence of different crystallization solvents on crystal structure and molecular conformations, with different conformations observed under different solvent conditions. Density functional theory calculations supported the experimental results, confirming the existence of different conformations under varying solvent conditions.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Chemistry, Multidisciplinary
Naoya Morohashi, Atsuya Sakamoto, Tomoaki Matsumoto, Takuro Sasaki, Masaki Saito, Tetsutaro Hattori
Summary: To develop a method for selectively separating hard-to-separate organic molecules, the control of guest selectivity was examined using external factors such as solvents, temperature, and additives. The inclusion of monosubstituted phenol isomers with p-tert-butylcalix[4]arene crystals showed selective switching between different isomers. The mechanism of guest selectivity was determined by X-ray crystal structure analysis, thermal stabilities, and formation rates of inclusion crystals.
CRYSTAL GROWTH & DESIGN
(2023)
Review
Chemistry, Multidisciplinary
Xiangdong Guo, Wei Lyu, Tinghan Chen, Yang Luo, Chenchen Wu, Bei Yang, Zhipei Sun, F. Javier Garcia de Abajo, Xiaoxia Yang, Qing Dai
Summary: 2D monolayers can be vertically stacked in van der Waals heterostructures to support a wide range of confined polaritons. This offers advantages in terms of controlling the constituent layers, stacking sequence, and twist angles. These heterostructures have extended the performance and functions of polaritons, and potential applications include nanophotonic integrated circuits.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
A. J. Sternbach, S. H. Chae, S. Latini, A. A. Rikhter, Y. Shao, B. Li, D. Rhodes, B. Kim, P. J. Schuck, X. Xu, X-Y Zhu, R. D. Averitt, J. Hone, M. M. Fogler, A. Rubio, D. N. Basov
Summary: Layered crystals, such as tungsten diselenide, can exhibit unconventional optical properties that allow for the propagation of subdiffractional waveguide modes with hyperbolic dispersion. This study demonstrates optically induced hyperbolicity in WSe2 and explores the role of quantum transitions of excitons in the observed polaritonic response.
Review
Chemistry, Multidisciplinary
Hui-Lei Hou, Cosimo Anichini, Paolo Samori, Alejandro Criado, Maurizio Prato
Summary: In the past 15 years, 2D materials have revolutionized materials science and become powerful components for high-performance chemical sensors. By forming van der Waals heterostructures (VDWHs), the individual drawbacks of 2D materials can be overcome, leading to superior sensitivities, selectivity, and stability. This review discusses the latest developments in chemical sensors based on VDWHs of 2D materials, including sensing mechanisms and future directions with potential impact in environmental sciences and biomedical applications.
ADVANCED FUNCTIONAL MATERIALS
(2022)
Article
Chemistry, Organic
Ying-Hong Ma, Yu Yu, Shuai Fan, Xiao-Pu Jia, Sheng-An Tang, Shu-Qing Wang, Wei-Li Dong, Shao-Yong Li
Summary: This study systematically investigated the reaction universality of bridge nitration under different conditions. The results showed that various bridging chiral p-tert-butylcalix[4]arenes with a mononitro bridge substituent were successfully synthesized.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Review
Chemistry, Multidisciplinary
Fang Wang, Tao Zhang, Runzhang Xie, Anna Liu, Fuxing Dai, Yue Chen, Tengfei Xu, Hailu Wang, Zhen Wang, Lei Liao, Jianlu Wang, Peng Zhou, Weida Hu
Summary: With the continuous advancement of nanofabrication techniques and the discovery of useful manipulation mechanisms in high-performance applications, the morphology and usage of junction devices in photodetectors have undergone fundamental revolution. New types of photodetectors, not relying on any junction, have emerged, offering high signal-to-noise ratio and multidimensional modulation. This review focuses on a unique category of material systems, van der Waals materials, which support novel high-performance photodetectors beyond junctions.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Long Zhang, Fengcheng Wu, Shaocong Hou, Zhe Zhang, Yu-Hsun Chou, Kenji Watanabe, Takashi Taniguchi, Stephen R. Forrest, Hui Deng
Summary: Controlling matter-light interactions with cavities is crucial in modern science and technology. By integrating MoSe2-WS2 heterobilayers in a microcavity, cooperative coupling between moire-lattice excitons and microcavity photons has been established, providing versatile control of both matter and light. This moire polariton system combines strong nonlinearity and microscopic-scale tuning of matter excitations, offering a platform to study collective phenomena from tunable arrays of quantum emitters.
Review
Chemistry, Multidisciplinary
Tianping Ying, Tongxu Yu, Yanpeng Qi, Xiaolong Chen, Hideo Hosono
Summary: By breaking traditional alloying strategy restrictions, the high entropy concept has expanded the field of alloy exploitation. This review focuses on the combination of the high entropy concept and van der Waals systems to create a new category of materials called high entropy van der Waals materials (HEX). The design strategy for HEX incorporates the local features of high entropy materials and the holistic degrees of freedom in van der Waals materials, successfully leading to the discovery of various high entropy compounds with desirable physical properties. Additionally, deliberate design of structural units and their stacking configuration in HEX can also enhance catalytic performance.
Article
Chemistry, Multidisciplinary
Xiaoqing Chen, Yu Zhang, Ruijuan Tian, Xianghu Wu, Zhengdong Luo, Yan Liu, Xinran Wang, Jianlin Zhao, Xuetao Gan
Summary: A quadratically nonlinear photodetector (QNPD) composed of a van der Waals (vdW) stacked GaSe/InSe heterostructure is reported in this study. The QNPD exhibits unique electronic and optical attributes and extends the photodetection wavelength range from 900 to 1750 nm due to the extra second-harmonic generation (SHG) process in GaSe/InSe. It is highly sensitive to the variation of optical intensity and can be used as an autocorrelator for measuring ultrafast pulse widths and an optoelectronic mixer for signal processing.
Review
Materials Science, Multidisciplinary
Lixin Liu, Tianyou Zhai
Summary: The article reviews the latest research activities on wafer-scale vdWHs and their applications, outlining preparation strategies and applications to showcase their potential in electronic, optoelectronic, and flexible devices fields.
Article
Chemistry, Multidisciplinary
Maurits J. A. Houmes, Samuel Manas-Valero, Alvaro Bermejillo-Seco, Eugenio Coronado, Peter G. Steeneken, Herre S. J. van der Zant
Summary: This article investigates the structural anisotropy of CrPS4 and its relationship with magnetic phase transitions and discovers different mechanical response behavior compared to previously studied van der Waals magnets. The results demonstrate the potential of CrPS4 in the field of low-dimensional magnetism and show the potential of mechanical resonators in studying structural modifications in 2D materials and van der Waals heterostructures.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Haonan Ling, Jacob B. Khurgin, Artur R. Davoyan
Summary: Layered van der Waals materials provide unique atomic-void channels with subnanometer dimensions, offering opportunities for advanced applications such as sensing and quantum information. Theoretical limits of light guiding in these channels show that materials with strong resonances, excitonic and polaritonic properties are ideal for deeply subwavelength light guiding. Transition metal dichalcogenides with excitonic properties can concentrate over 70% of optical power within them.
Article
Chemistry, Multidisciplinary
Muhammad A. K. Purbayanto, Madhurya Chandel, Magdalena Birowska, Andreas Rosenkranz, Agnieszka M. Jastrzebska
Summary: This article discusses the fundamental basis and recent findings in vertical vdW heterostructures composed of MXenes as a primary component and other 2D materials as secondary components. MXenes, with their rich surface chemistry and intriguing optical properties, offer a unique platform for optoelectronics applications. Coupling MXenes with other 2D materials in vdW heterostructures can provide new opportunities for exploring novel physical phenomena in quantum-confined nanostructures and devices.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Vincent Wing-hei Lau, Igor Moudrakovski, Junghoon Yang, Jiliang Zhang, Yong-Mook Kang
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2020)
Article
Chemistry, Multidisciplinary
Lars Grunenberg, Goekcen Savasci, Maxwell W. Terban, Viola Duppel, Igor Moudrakovski, Martin Etter, Robert E. Dinnebier, Christian Ochsenfeld, Bettina V. Lotsch
Summary: Covalent organic frameworks with amine linkages can be directly accessed using a novel synthetic strategy, enabling further postsynthetic functionalization for increased hydrolytic stability and potential use as heterogeneous catalysts.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Julia Kroeger, Alberto Jimenez-Solano, Goekcen Savasci, Vincent W. h. Lau, Viola Duppel, Igor Moudrakovski, Kathrin Kuester, Tanja Scholz, Andreas Gouder, Marie-Luise Schreiber, Filip Podjaski, Christian Ochsenfeld, Bettina V. Lotsch
Summary: The study investigates the effect of ultrasonication on tuning the particle size and concentration of surface functional groups in the carbon nitride poly(heptazine imide) photocatalyst. It reveals that an optimal amount of defects can enhance the photocatalytic activity by promoting charge percolation, while excess terminal defects can act as recombination centers and decrease the photocatalytic activity for hydrogen evolution. Properly agglomerated small particles can partially restore the photocatalytic activity.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Physical
Leo Diehl, Douglas H. Fabini, Nella M. Vargas-Barbosa, Alberto Jimenez-Solano, Theresa Block, Viola Duppel, Igor Moudrakovski, Kathrin Kuester, Rainer Poettgen, Bettina Lotsch
Summary: Directed design of new photocatalysts remains challenging; for example, SnTiO3 demonstrates wide valence band, low hole effective mass, and visible-light H-2 evolution activity, but surface oxidation hampers efficient extraction of photoexcited electrons. Extending ab initio calculations to various Sn(II) oxide semiconductors reveals a broad range of valence band maxima and competition between dispersion and stability against oxidation.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Physical
Anna-Katharina Hatz, Igor Moudrakovski, Sebastian Bette, Maxwell W. Terban, Martin Etter, Markus Joos, Nella M. Vargas-Barbosa, Robert E. Dinnebier, Bettina Lotsch
Summary: The study focuses on the fast conduction of lithium ions in water-assisted restacked lithium tin sulfide nanosheets. The presence of water increases the stacking distance, screening the interaction between lithium ions and anions, resulting in a significant increase in ionic conductivity. This research expands the family of nanosheet-based ionic conductors and helps understand the transport mechanism of lithium ions in a nanoconfined 2D space facilitated by hydration.
CHEMISTRY OF MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Julia Kroeger, Filip Podjaski, Goekcen Savasci, Igor Moudrakovski, Alberto Jimenez-Solano, Maxwell W. Terban, Sebastian Bette, Viola Duppel, Markus Joos, Alessandro Senocrate, Robert Dinnebier, Christian Ochsenfeld, Bettina V. Lotsch
Summary: The influence of different counterions on the conductivity and photocatalytic activity of 2D carbon nitride poly(heptazine imide) (PHI) was investigated. Na-PHI showed superior conductivity and photocatalytic activity compared to other M-PHIs, likely due to the geometry and size of the ions in the pores. Increasing relative humidity resulted in significant improvements in both ionic conductivity and photocatalytic activity.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Robert Calaminus, Sascha Harm, Douglas H. Fabini, Lucas G. Balzat, Anna-Katharina Hatz, Viola Duppel, Igor Moudrakovski, Bettina V. Lotsch
Summary: In this study, a novel approach to improve the ionic conductivity of thiophosphate solid electrolytes (SEs) is reported. High ionic conductivities are achieved by the in situ formation of Li7SiPS8/lithium argyrodite Li6PS5X (X = Cl, Br, I) hybrid SEs. The directed growth of the hybrid SEs reduces the grain boundary resistance and leads to significantly increased ionic conductivities.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Yue Guo, Maxwell W. Terban, Igor Moudrakovski, Andreas Muenchinger, Robert E. E. Dinnebier, Jelena Popovic, Joachim Maier
Summary: The water-in-salt (WIS) electrolyte is a newly developed battery electrolyte system that has high ionic conductivity, allowing cells to have a wider electrochemical window and improved cycling performance. In this study, the physical and electrochemical properties of a LiTFSI-H2O binary system were systematically measured in the salt concentration range of 21-55.5 mol kg(-1) in the semi-solid state. The results suggest that the majority of the species are neutral or negatively charged ion pairs or clusters in higher aggregation states. The study also reveals the existence of local minima in temperature-dependent conductivity and provides details of the phase transition of LiTFSI monohydrate.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Xun Ou, Junfeng Luo, Jiliang Zhang, Chi-Liang Chen, Jing Yu, Jiawei Hu, Chung-Kai Chang, Igor Moudrakovski, Vincent Wing-hei Lau, Ruirui Zhao
Summary: This study thoroughly investigates the influence of Mg cations, F anions, and their co-doping on the atomic structures of LiCoO2 and their impact on electrochemical performance. The results show that MgO4 tetrahedra can suppress charge transfer and reduce pseudo-JTE, while F doping increases ligand-field strength but decreases structural stability. In contrast, Mg/F co-doping generates CoO5F-MgO4F2-CoO5F medium-range orders, which reduce structural distortion and charge transfer, leading to improved electrochemical performance.
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Inorganic & Nuclear
Maximilian A. A. Plass, Maxwell W. W. Terban, Tanja Scholz, Igor Moudrakovski, Viola Duppel, Robert E. E. Dinnebier, Bettina V. V. Lotsch
Summary: The structure of the first lithium-containing bismuthortho (o)-thiophosphate was determined using a combination of powder X-ray, neutron, and electron diffraction. The disordered distribution of lithium ions within the host structure was investigated, and the lithium ion dynamics and diffusion pathways were studied. The total lithium ion conductivities and activation energies were measured, showing a range of values depending on the bismuth content.
INORGANIC CHEMISTRY
(2023)
Article
Chemistry, Physical
Maximilian A. Plass, Sebastian Bette, Nina Philipp, Igor Moundrakovski, Kathrin Kuester, Robert E. Dinnebier, Bettina V. Lotsch
Summary: This study investigates the electrochemical properties of lithium rare earth metal iodides Li3MI6 and reveals the impact of iso- and aliovalent substitutions on their ionic transport properties. The results show that lithium rare earth metal iodides obtained from solid-state synthesis outperform those synthesized through mechanochemical ball-milling in terms of ionic conductivity and activation energy for ion diffusion. However, when mechanochemical ball-milling is combined with post-synthetic calcination, the iodides show similar ionic conductivities as their counterparts obtained from conventional solid-state synthesis.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Chemistry, Physical
Robert Calaminus, Sascha Harm, Douglas H. Fabini, Lucas G. Balzat, Anna-Katharina Hatz, Viola Duppel, Igor Moudrakovski, Bettina V. Lotsch
Summary: This study presents a novel approach to improve the ionic conductivities of thiophosphate solid electrolytes (SEs) through in situ formation of hybrid SEs. The experimental results show that the ionic conductivity can reach up to 7 mS cm(-1), exceeding that of the original SEs and simple mixtures.
CHEMISTRY OF MATERIALS
(2022)
Article
Chemistry, Physical
Markus Joos, Maurice Conrad, Igor Moudrakovski, Maxwell W. Terban, Ashkan Rad, Payam Kaghazchi, Rotraut Merkle, Robert E. Dinnebier, Thomas Schleid, Joachim Maier
Summary: This study investigates the Li+ cation conductivity of anhydrous Li(SCN), focusing on the high migration enthalpy of lithium vacancies. Impedance spectra and conductivity data analysis reveal two bulk relaxation processes, with fast ion transport at high frequencies and slow ion migration at low frequencies. Solid state nuclear magnetic resonance (ssNMR) and pair distribution function (PDF) analysis support the impedance results, showing a frequency dependent conductivity related to the slow relaxation of thiocyanate (SCN)(-) anions.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Tanja Scholz, Christian Schneider, Roland Eger, Viola Duppel, Igor Moudrakovski, Armin Schulz, Juergen Nuss, Bettina Lotsch
Summary: The study compares the structures and properties of Na4P2S6 materials prepared by two different synthesis methods, finding that the material synthesized via solid-state reaction undergoes a Na+ and vacancy disorder-driven enantiotropic phase transition at 160 degrees C, while the precipitated Na4P2S6 already crystallizes in a beta-like polymorph at room temperature. Electrochemical impedance spectroscopy shows that the precipitated beta-like Na4P2S6 has higher ionic conductivity at room temperature compared to the solid-state alpha polymorph.
JOURNAL OF MATERIALS CHEMISTRY A
(2021)
Article
Chemistry, Physical
Ruirui Zhao, Jiliang Zhang, Gi-Hyeok Lee, Kai Zhang, Vincent Wing-hei Lau, Jey-Jau Lee, Igor Moudrakovski, Yue-Lin Yang, Feng Zou, Mihui Park, I-Ming Hung, Yong-Mook Kang
JOURNAL OF MATERIALS CHEMISTRY A
(2020)
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)