Article
Chemistry, Multidisciplinary
Jan Hagenlocher, Katharina Broch, Matthias Zwadlo, Daniel Lepple, Jonathan Rawle, Francesco Carla, Satoshi Kera, Frank Schreiber, Alexander Hinderhofer
Summary: Planar organic heterostructures are widely used in various devices, and the energy level alignment at different interfaces plays a crucial role in device performance. This study investigates the electronic and structural properties of perfluoropentacene-on-[6]phenacene heterostructure, finding that the material work function increases with thickness for both materials.
ADVANCED MATERIALS INTERFACES
(2022)
Article
Materials Science, Multidisciplinary
Li Zhang, Melissa Berteau-Rainville, Tianshu Zhai, Yuhao Wang, Qi Wang, Ingo Salzmann, Steffen Duhm
Summary: The energy-level alignment (ELA) at interfaces plays a crucial role in organic optoelectronic applications by determining the device performance. The ELA at organic-inorganic interfaces in organic thin films is influenced by gap states and/or tailing states of the frontier molecular orbitals. The susceptibility of conjugated organic materials to chemical and structural defects is highlighted as a key factor in the ELA at interfaces.
PHYSICA STATUS SOLIDI-RAPID RESEARCH LETTERS
(2023)
Review
Chemistry, Multidisciplinary
Deying Luo, Xiaoyue Li, Antoine Dumont, Hongyu Yu, Zheng-Hong Lu
Summary: The focus of the research is on discussing surface and interface engineering to reduce deep-level defects, and by selecting appropriate materials and processing methods to enhance the device performance of both solar cells and light-emitting diodes.
ADVANCED MATERIALS
(2021)
Article
Energy & Fuels
Fengshuo Zu, Marcel Ross, Lennart Frohloff, Dongguen Shin, Nir Tessler, Steve Albrecht, Norbert Koch
Summary: Tremendous progress has been made in utilizing metal halide perovskites (MHPs) in various applications, particularly in photovoltaics, in the past decade. To fully realize the potential of MHP materials in optoelectronic devices, a better understanding of the electronic energy level alignment at perovskite-based interfaces is required, especially under device operation conditions.
Article
Materials Science, Coatings & Films
Le Wang, Yingge Du, Scott A. Chambers
Summary: The behavior and functionality of semiconductor heterojunctions rely on band alignment, traditionally measured using x-ray photoelectron spectroscopy. A new study shows that band alignment can also be determined using a single core-level photoelectron spectrum for a common element in both materials, based on energy splitting between photoemission features from the two materials.
JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A
(2021)
Article
Chemistry, Multidisciplinary
Dongguen Shin, Fengshuo Zu, Edgar R. Nandayapa, Lennart Frohloff, Emily Albert, Emil J. W. List-Kratochvil, Norbert Koch
Summary: In this study, it is revealed that a straddling type-I energy level alignment is present at the 2D PEA(2)PbI(4)/3D MAPbI(3) interfaces, explaining the enhanced photoluminescence of the 3D perovskite induced by energy transfer from the 2D perovskite. These results provide a fundamental understanding of the electronic properties at the investigated 2D/3D MHP interfaces and suggest reconsideration of the electronic properties of other 2D/3D MHP heterostructures.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Xuehua Zhou, Juansu Zhang, Guoliang Bai, Chunhua Wang, Wenxiang He, Xiangnan Sun, Jianli Zhang, Jiaojiao Miao
Summary: Improving the charge transport characteristics is crucial for achieving the multifunction of molecule-based devices. Accurate measurement of the energy levels of molecular semiconductors is essential for evaluating their availability and optimizing device performance. A three-terminal hot electron transistor has been developed, which records the charge transport and provides in-situ characterization of the energy information as intrinsic properties of the molecular semiconductor.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Chemistry, Physical
Keitaro Eguchi, Hideyuki Murata
Summary: Understanding semiconductor-ionic-liquid (IL) interfaces is crucial for high-performance electronic devices. Traditional photoelectron spectroscopy has limitations in analyzing interfacial electronic states, especially HOMO. This study used photoelectron yield spectroscopy to investigate the impact of IL layers on the electronic states of pentacene submonolayer films. The results showed that IL layers induced energetic disorder and shifts in energy levels, demonstrating the potential of the PYS technique in interfacial characterization.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Shupeng Chen, Shulong Wang, Hongxia Liu, Tao Han, Hao Zhang
Summary: In this letter, a quasi-broken gap tunneling field effect transistor (QB-TFET) based on InGaAs/GaAsSb heterojunction is proposed and investigated. The tunneling efficiency of QB-TFET is improved by applying a trench gate structure, an InGaAs pocket layer, and an intrinsic InGaAs spacer. The gate dielectric is made of TiO2 to enhance the control ability of gate voltage on the channel. The electrical characteristic of QB-TFET with different compositions of InGaAs and GaAsSb is analyzed, and the proposed QB-TFET shows superior performance compared to other works.
Article
Physics, Applied
Kohei Shimizu, Hiroshi Tokairin, Ryotaro Nakazawa, Ikuko Nakamura, Satoshi Yasuno, Keitaro Ikegami, Yuki Yamaguchi, Yuya Tanaka, Hisao Ishii
Summary: In this study, the density of states (DOS) at the Alpha-NPD/electrode interfaces is investigated using high-sensitivity UV photoemission spectroscopy. The nature of hole injection is discussed based on the observed DOS and a simple simulation. The results indicate that weak DOS close to the Fermi level is critical for carrier injection.
APPLIED PHYSICS EXPRESS
(2022)
Review
Materials Science, Multidisciplinary
Selina Olthof
Summary: The collaborative efforts between surface scientists and device specialists have successfully utilized photoelectron spectroscopy to unravel the working mechanisms of organic semiconductor devices.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Chemistry, Multidisciplinary
Soohyung Park, Niklas Mutz, Sergey A. Kovalenko, Thorsten Schultz, Dongguen Shin, Areej Aljarb, Lain-Jong Li, Vincent Tung, Patrick Amsalem, Emil J. W. List-Kratochvil, Julia Staehler, Xiaomin Xu, Sylke Blumstengel, Norbert Koch
Summary: The research reveals that PTCDA/ML-MoS2 formed a straddling type-I level alignment supported by insulating sapphire, with PTCDA having the wider energy gap. Resonance energy transfer from PTCDA to ML-MoS2 occurs on a sub-picosecond time scale, enhancing the PL yield from ML-MoS2 and modulating the photoresponse accordingly.
Article
Engineering, Environmental
Jia Yuan, Huayu Bao, Hongli Liu, Shirong Wang, Xianggao Li
Summary: The alignment of energy levels between semiconductors and hole-transporting materials is crucial for the efficiency of perovskite solar cells. By controlling the surface termination state of perovskite crystals using a mixed solvent, the energy levels can be adjusted to better match the HTMs, leading to improved charge extraction and reduced recombination rates. This optimization results in increased open circuit voltage and conversion efficiency of the PSCs.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Chemistry, Analytical
Xiaotong Dong, Meiyan Zhu, Liangbin Jia, Ming Li, Ye Ma, Minggang Zhao
Summary: The study successfully prepared CeO2@C-QAs for detecting melamine in milk powder, achieving high sensitivity detection in acidic and alkaline environments and good recovery rates by studying the interfacial effects of the Schottky barrier on electrochemical detection. The lowest detection limit was significantly lower than the international safety threshold, providing an opportunity for achieving anti-interference electrochemical detection by utilizing the interfacial energy barrier effects.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Chemistry, Physical
Axel Belser, Katharina Greulich, Peter Gruninger, Reimer Karstens, Ruslan Ovsyannikov, Erika Giangrisostomi, Peter Nagel, Michael Merz, Stefan Schuppler, Thomas Chasse, Heiko Peisert
Summary: The interface properties of CoPcF16 on Cu(110) and Cu(110)-(2 x 1)O were investigated using XPS, UPS, XAS, and STM techniques. Charge transfer from both substrates to the central Co ion of CoPcF16 was observed, with a partial suppression of the interaction between CoPcF16 molecules and the Cu(110) substrate by oxygen termination. Additionally, bidirectional charge transfer involving the macrocycle of CoPcF16 molecules was concluded.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Chemistry, Physical
Fu Huang, Feier Fang, Yue Zheng, Qi You, Henan Li, Shaofan Fang, Xiangna Cong, Ke Jiang, Ye Wang, Cheng Han, Wei Chen, Yumeng Shi
Summary: In this study, an optically-stimulated artificial synapse has been demonstrated using a heterostructure of Cs2AgBiBr6 perovskite and IGZO thin film. The heterostructure significantly enhances the photoresponse and synaptic plasticity, enabling the realization of various synaptic behaviors and achieving a high accuracy rate for pattern recognition in an artificial neural network simulation.
Article
Chemistry, Physical
Haotian Lu, Chunpeng Yang, Feifei Wang, Lu Wang, Jinghong Zhou, Wei Chen, Quan-Hong Yang
Summary: Lithium metal anodes have great potential for high-energy-density secondary batteries. However, uncontrolled lithium dendrite growth inhibits their practical application. This study proposes an interfacial high-concentration electrolyte induced by nitrogen- and oxygen-doped carbon nanosheets (NO-CNS) to stabilize lithium metal anodes. The interfacial high-concentration electrolyte improves charge transfer kinetics and ionic mass-transfer, leading to excellent electrochemical performance.
Article
Chemistry, Physical
Haidong Liang, Yue Zheng, Leyi Loh, Zehua Hu, Qijie Liang, Cheng Han, Michel Bosman, Wei Chen, Andrew A. Bettiol
Summary: In this study, efficient n-type doping of 2D TMDs was achieved through ion beam irradiation, and the doping effect remained stable even after one year of exposure to ambient conditions. Furthermore, high-performance homogenous p-n junction diodes were fabricated using localized ion irradiation.
Article
Multidisciplinary Sciences
Zhangliu Tian, Yumin Da, Meng Wang, Xinyu Dou, Xinhang Cui, Jie Chen, Rui Jiang, Shibo Xi, Baihua Cui, Yani Luo, Haotian Yang, Yu Long, Yukun Xiao, Wei Chen
Summary: Photoelectrochemical oxidation provides a promising strategy for glucaric acid production. In this work, selective oxidation of glucose to glucaric acid is realized on the photoanode of defective TiO2 decorated with single-atom Pt via a photoelectrochemical strategy. By optimizing oxygen vacancies, the defective TiO2 photoanode exhibits greatly improved charge separation, significantly enhanced selectivity, and yield of C-6 products.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Yumin Da, Zhangliu Tian, Rui Jiang, Yuan Liu, Xu Lian, Shibo Xi, Yi Shi, Yongping Wang, Haotian Lu, Baihua Cui, Jinfeng Zhang, Xiaopeng Han, Wei Chen, Wenbin Hu
Summary: This paper reports the synthesis of a PtNi-NC catalyst with high catalytic activity. Density functional theory calculations reveal that PtNi dual atoms generate a synergistic effect by modulating the local electronic structure and optimizing the charge distribution, contributing to optimized adsorption properties and enhanced electrocatalytic performance. This work provides a new avenue for the fabrication of dual-atom catalysts.
SCIENCE CHINA-MATERIALS
(2023)
Article
Electrochemistry
Yuan Liu, Xu Lian, Chonglai Jiang, Zejun Sun, Jinlin Yang, Yishui Ding, Wei Chen
Summary: To stabilize sodium metal anodes (SMAs), various strategies have been developed, including employing anode hosts and electrolyte additives to establish protective layers. In this study, the interaction mechanism between sodium metal and sulfur-containing functional groups was investigated using comparative model systems of alpha-sexithiophene (6T) and p-sexiphenyl (6P). The results showed that sodium atoms tend to interact with sulfur atoms and their connected carbon atoms as well as the aromatic carbon atoms of the end groups of 6T molecules, while no chemical interaction between Na and 6P molecules was observed. These findings shed light on the rational design of sulfur-containing protective materials and relevant interface engineering to stabilize SMAs.
Article
Engineering, Electrical & Electronic
Yafang Zeng, Xianghong Zhang, Yanxue Hao, Yi Zou, Bangyan Zeng, Qian Yang, Tailiang Guo, Huipeng Chen, Wei Chen
Summary: In this study, a neural device based on IGZO memristors fabricated by the solution method is proposed, which has simple process steps, no vacuum treatment process, rapid film formation, easy doping, and more suitability for low-temperature film deposition on a flexible substrate, as well as compatibility with a thin-film transistor (TFT). The solution-processed IGZO-based neurons show great potential for neuromorphic systems.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Chemistry, Physical
Li Peize, Lian Xu, Gou Jian, Duan Sisheng, Ding Yishui, Niu Yuxiang, Chen Wei
Summary: Realizing effective Ohmic contact to SiC is a major challenge in high-power and high-frequency SiC electronics. Here, we grew a high-work-function interfacial molybdenum trioxide (MoO3) layer on 4H-SiC(0001) and investigated its surface properties during annealing in different gas environments. The results show that the MoO3 layer tends to be reduced and the surface work function decreases accordingly, making it a promising approach for achieving effective Ohmic contact with SiC.
Article
Chemistry, Physical
Yumin Da, Rui Jiang, Zhangliu Tian, Ganwen Chen, Yukun Xiao, Jinfeng Zhang, Shibo Xi, Yida Deng, Wei Chen, Xiaopeng Han, Wenbin Hu
Summary: Alloying platinum with early transition metals is a promising approach to optimize catalyst adsorption behaviors. A strategy combining thermal shock technique with electrochemical activation is reported for the first time to prepare Pt3V alloy as a hydrogen evolution reaction catalyst. The as-prepared catalyst exhibits exceptional catalytic activity and durability, outperforming the state-of-the-art Pt/C catalyst. This work may inspire future research on Pt-based early transition metal alloy catalysts for electrocatalysis.
ADVANCED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yumin Da, Zhangliu Tian, Rui Jiang, Ganwen Chen, Yuan Liu, Yukun Xiao, Jinfeng Zhang, Shibo Xi, Wei Chen, Xiaopeng Han, Wenbin Hu
Summary: In this research, a highly efficient electrocatalyst for the hydrogen evolution reaction was developed by using Pt single atoms supported on ultrathin NiO nanosheets. A self-gating phenomenon was induced in the nanosheets, resulting in the formation of active and inert regions. The active region allows for the HER process to occur, while the inert region accumulates charge carriers, leading to high conductivity and stability of the electrocatalyst.
Article
Chemistry, Physical
Yishui Ding, Xiangyu Hou, Tengyu Jin, Yanan Wang, Xu Lian, Yuan Liu, Yihe Wang, Sisheng Duan, Xiangrui Geng, Meng Wang, Jingyu Mao, Yuanyuan Zhang, Peirong Tang, Minghua Li, Huamao Lin, Yao Zhu, Siewlang Teo, Qiang Zhu, Ming Lin, Wei Chen
Summary: In this study, the growth mechanism and interfacial chemistry of ultrathin platinum and molybdenum films on high-crystalline Al1-xScxN surface were investigated. The chemical and electronic structure evolution of the interface during the deposition process were examined using in-situ X-ray photoelectron spectroscopy and ultraviolet photoelectron spectroscopy. The structural properties of the interface were characterized by cross-sectional transmission electron microscopy, X-ray diffraction spectroscopy, and atomic force microscopy. The study reveals the formation of ionic Pt2+-N bonds at the Pt/Al1-xScxN interface, while molybdenum does not bond with the substrate. Furthermore, electron transfer induces upward band-bending effects on the Al1-xScxN surface upon both platinum and molybdenum interactions. The research on the chemical and structural properties of ultrathin metal electrodes and Al1-xScxN interfaces provides guidance for designing high-performance micro-electromechanical devices.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Xiang Chen, Xinyue Xu, Yuwen Cheng, He Liu, Dongdong Li, Yumin Da, Yongtao Li, Dongming Liu, Wei Chen
Summary: The study presents a facile strategy to enhance the oxygen evolution reaction (OER) activity of Ni-based materials through doping and interfacial modulation. Experimental and theoretical results demonstrate that this strategy can effectively tune the binding energies of OER intermediates and reduce the energy barrier, leading to significantly improved OER activity.
Article
Chemistry, Physical
Xiangrui Geng, Yishui Ding, Yuan Liu, Xiangyu Hou, Tengyu Jin, Wei Chen
Summary: Achieving effective Ohmic contact between SiC and metal electrodes remains a challenge due to the high Schottky barrier. One promising approach is to introduce a high-work-function interfacial layer. However, the interaction mechanisms between the interfacial layer and the SiC substrate have been rarely studied. In this work, layers of high-work-function MoO3 and Pt were grown on the SiC surface, and the evolutions of the system during annealing under different environments were studied. The results provide a detailed understanding of the Pt/MoO3 interface and its response to various conditions.
Article
Electrochemistry
Yuan Liu, Xu Lian, Xiaojiang Yu, Yuxiang Niu, Jinlin Yang, Yishui Ding, Wei Chen
Summary: This study investigates the interaction processes between alkali metal anodes (AMAs) and organic protective materials containing nitrogen groups. The results show that Li and Na preferentially interact with the outer nitrile groups of the protective material before interacting with the inner imine groups. Additionally, the sodiophilicity difference between the two nitrogen-containing groups is smaller compared to their lithiophilicity difference. These findings provide valuable insights for the development of more effective protective materials in the future.
BATTERIES & SUPERCAPS
(2023)
Review
Chemistry, Multidisciplinary
Yumin Da, Rui Jiang, Zhangliu Tian, Xiaopeng Han, Wei Chen, Wenbin Hu
Summary: The development of cost-effective and highly efficient electrocatalysts is crucial for achieving a low-carbon footprint in the industry. Single-atom alloys (SAAs) have unique electronic structures, well-defined active sites, and maximum atom utilization, making them promising replacements for traditional noble metal catalysts. SAAs can tailor the adsorption properties of reaction species to promote electrocatalytic behaviors.
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)