Article
Multidisciplinary Sciences
Wenhui Li, Xuanlin Zhang, Jia Yang, Song Zhou, Chuangye Song, Peng Cheng, Yi-Qi Zhang, Baojie Feng, Zhenxing Wang, Yunhao Lu, Kehui Wu, Lan Chen
Summary: This study demonstrates room-temperature ferroelectricity in van der Waals layered GaSe down to monolayer with mirror symmetric structures, attributing it to the intralayer sliding of the Se atomic sublayers. The discovery offers great opportunities for novel nonvolatile memory devices and optoelectronics applications.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Yi Wan, Xing Cheng, Yanfang Li, Yaqian Wang, Yongping Du, Yibin Zhao, Bo Peng, Lun Dai, Erjun Kan
Summary: Magneto-optical effects, originating from interactions between light and magnetism, provide a way to characterize magnetic materials and have applications in light modulators, magnetic field sensors, and data storage. Applying a perpendicular magnetic field can produce significant Raman scattering rotation in non-magnetic materials, offering the potential for manipulating inelastically scattered light.
Article
Chemistry, Physical
Fabio Caruso
Summary: The coupled nonequilibrium dynamics of electrons and phonons in monolayer MoS2 are studied, with strict phase-space constraints in electron-phonon scattering significantly influencing the decay path of excited electrons and holes. The momentum selectivity in phonon emission results in highly anisotropic population of phonons in reciprocal space, persisting for up to 10 ps until thermal equilibrium is restored by phonon-phonon scattering. Achieving control of the nonequilibrium dynamics of the lattice may offer unexplored opportunities to selectively enhance the phonon population of two-dimensional crystals and tailor electron-phonon interactions over subpicosecond time scales.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Yu. S. Ponosov, D. Y. Novoselov
Summary: The study demonstrates that the shapes and energy positions of electronic continua are influenced by temperature and excitations symmetry. Experimental spectra were modeled using ab initio DFT electronic structure calculations, showing promising results.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Nanoscience & Nanotechnology
Yan Yin, Min Yi, Wanlin Guo
Summary: The lattice thermal conductivity of the newly synthesized 2D MoSi2N4 family was analyzed using ab initio phonon Boltzmann transport calculations. It was found that MoSi2N4 showed anomalous behavior in terms of thermal conductivity compared to other elements within the same group, deviating from the classic rule proposed by Slack.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Tianlun Allan Huang, Marios Zacharias, D. Kirk Lewis, Feliciano Giustino, Sahar Sharifzadeh
Summary: Exciton-phonon interactions in monolayer germanium selenide lead to the renormalization of the optical gap, with the strongest coupling to optical phonons at around 100 cm(-1). The interaction between excitons and phonons is similar in monolayer and bulk GeSe. Overall, the combination of many-body perturbation theory and special displacements offers a new approach to study electron-phonon couplings and band gap renormalization in excitonic spectra.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Physics, Applied
Eito Asakura, Takeshi Odagawa, Masaki Suzuki, Shutaro Karube, Junsaku Nitta, Makoto Kohda
Summary: The steady-state valley polarization in a monolayer of MoS2 caused by polarized photoexcitation at different excitation energies reveals intravalley scattering from B excitons to A excitons. As the excitation energy of circularly polarized light increases, the valley polarization detected in the A exciton decreases monotonously and is completely suppressed due to phonon-mediated scattering, but excitation to levels greater than the B-exciton energy can recover the valley polarization in the A exciton.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Shiyu Sun, Jingying Zheng, Ruihao Sun, Dan Wang, Guanliang Sun, Xingshuang Zhang, Hongyu Gong, Yong Li, Meng Gao, Dongwei Li, Guanchen Xu, Xiu Liang
Summary: Defect-containing monolayer MoS2 with abundant density of states and effective photoinduced charge transfer resonance becomes a promising and versatile substrate capable of detecting a wide range of dye molecules and enhancing Raman enhancement.
Article
Chemistry, Physical
Chao Hou, Jingwen Deng, Jianxin Guan, Qirong Yang, Zhihao Yu, Yilin Lu, Zihan Xu, Zefan Yao, Junrong Zheng
Summary: The research reveals that laser irradiation can enhance the photoluminescence of monolayer MoS2, with different effects observed under different atmospheres, being more significant in the presence of oxygen. Additionally, physically adsorbed water also plays a role in enhancing the photoluminescence of monolayer MoS2.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Multidisciplinary
Fabio Caruso, Patrick Amsalem, Jie Ma, Areej Aljarb, Thorsten Schultz, Marios Zacharias, Vincent Tung, Norbert Koch, Claudia Draxl
Summary: Experimental and theoretical evidence of strong electron-plasmon interaction in n-doped single-layer MoS2 has been reported. The emergence of distinctive signatures of polaronic coupling in the electron spectral function was revealed through angle-resolved photoemission spectroscopy measurements. Calculations based on many-body perturbation theory illustrated that electronic coupling to two-dimensional carrier plasmons provides an exhaustive explanation of the experimental spectral features and their energies.
Article
Chemistry, Physical
Ghulam Abbas, Farjana J. Sonia, Martin Jindra, Jiri Cervenka, Martin Kalbac, Otakar Frank, Matej Velicky
Summary: Electrostatic gating using electrolytes is an effective method for controlling the electronic properties of atomically thin two-dimensional materials such as graphene. However, the relationship between the ionic type, size, concentration, and gating efficiency is complex. We conducted in situ Raman microspectroscopy combined with electrostatic gating using various concentrated aqueous electrolytes to understand these relationships. We found that the ionic type and concentration do not significantly affect the doping rate of graphene in the high ionic strength limit of 3-15 M, and a large proportion of the applied voltage contributes to the Fermi level shift in concentrated electrolytes. We provide a practical overview of the doping efficiency for different gating systems.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Hongguang Xie, Chao Liu, Huamin Hu, Hao Yin, Jingxian Zhong, Xinrong Zong, Xiaohong Jiang, Junran Zhang, Wei Wang, Ye Tao, Runfeng Chen, Tianshi Qin, Gang Ouyang, Lin Wang
Summary: By utilizing ultraviolet-ozone treatment, dynamic properties and additional functions can be introduced to monolayer MoS2, with the ability to tune photoluminescence behavior and offer new possibilities for practical applications through control of treatment time, laser power, and storing time.
APPLIED SURFACE SCIENCE
(2021)
Article
Chemistry, Multidisciplinary
Jessica S. Lemos, Elena Blundo, Antonio Polimeni, Marcos A. Pimenta, Ariete Righi
Summary: This work presents a resonance Raman study conducted on the domes of monolayer MoS2, using 23 different laser excitation energies. The study reveals the exciton-phonon interactions of specific phonons (A'(1), E', and LA) with different excitonic optical transitions in strained MoS2 domes. The results show that the out-of-plane A'(1) phonon mode is significantly enhanced by the indirect exciton I and the C exciton, while the in-plane E' mode is only enhanced by the C exciton. The 2LA Raman band is significantly enhanced by the indirect exciton I and the A (or B) exciton, but not by the C exciton.
Article
Chemistry, Physical
Saumen Chaudhuri, Amrita Bhattacharya, Amal Kumar Das, Gour Prasad Das, Bhupendra Nath Dev
Summary: The effects of hydrostatic pressure on the transport properties of monolayer MoS2 are investigated, showing improved electronic and thermoelectric performance.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Zhenping Wang, Qing Cao, Kai Sotthewes, Yalei Hu, Hyeon S. Shin, Siegfried Eigler
Summary: This research focuses on modulating the optoelectronic properties of monolayer MoS2 on different graphene monolayers, showing that oxygen-functionalized graphene and reduced-oxo graphene can significantly enhance the photoluminescence intensity of MoS2, while pristine graphene leads to photoluminescence quenching. Additionally, the increase in photoluminescence intensity is higher in reduced-oxo graphene/MoS2 compared to oxygen-functionalized graphene/MoS2.
Article
Materials Science, Multidisciplinary
Jianqi Huang, Zhiyong Liu, Teng Yang, Zhidong Zhang
Summary: The first-order resonant Raman spectra of monolayer MoS2 exhibit anomalies under certain conditions, possibly related to optical absorption at specific reciprocal points, and the E Raman tensor varies with laser energy. The anomalous Raman intensity of the E mode under the same circular polarization is consistent with the pseudo-angular-momentum conservation law.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2022)
Biographical-Item
Physics, Multidisciplinary
Ado Jorio, Riichiro Saito, Jing Kong
Article
Chemistry, Multidisciplinary
Zheng Sun, Chin-Sheng Pang, Peng Wu, Terry Y. T. Hung, Ming-Yang Li, San Lin Liew, Chao-Ching Cheng, Han Wang, H-S Philip Wong, Lain-Jong Li, Iuliana Radu, Zhihong Chen, Joerg Appenzeller
Summary: This work presents a statistical study of ultrashort channel double-gated ML WS FETs, which exhibit excellent device performance and limited device-to-device variations. Through detailed analysis and simulations, the unexpected deterioration of subthreshold characteristics is observed and two potential causes are identified.
Article
Chemistry, Physical
Desman Perdamaian Gulo, Nguyen Tuan Hung, Tan-Ju Yang, Guo-Jiun Shu, Riichiro Saito, Hsiang -Lin Liu
Summary: This study investigated the optical properties of graphite single crystal at different temperatures using spectroscopic ellipsometry. The results showed that at room temperature, graphite exhibited wide spectral range in the ultraviolet energy region. The peak position shifted to lower energies and the intensity increased with increasing temperatures. The study also confirmed the presence of two resonant conditions in the ultraviolet energy region.
Article
Materials Science, Multidisciplinary
Uddipta Kar, Akhilesh Kr. Singh, Yu-Te Hsu, Chih-Yu Lin, Bipul Das, Cheng-Tung Cheng, M. Berben, Song Yang, Chun-Yen Lin, Chia-Hung Hsu, S. Wiedmann, Wei-Cheng Lee, Wei-Li Lee
Summary: In a thin Weyl semimetal, a thickness dependent Weyl-orbit quantum oscillation was observed by carrying out magneto-transport measurements on SrRuO3 thin films. The quantum oscillations with a frequency F-s1 of approximately 30 T appear to have a small Fermi pocket with a light effective mass. The oscillation amplitude is maximized for thicknesses between 10 and 20 nm, and the phase of oscillation shows a systematic change with film thickness. The F-s1 oscillation is attributed to be of surface origin based on thickness and field-orientation dependence.
NPJ QUANTUM MATERIALS
(2023)
Article
Chemistry, Physical
Linyi Wu, Yipei Li, Binghua Zhou, Jian Liu, Deliang Cheng, Shien Guo, Keng Xu, Cailei Yuan, Mingxi Wang, Gan Jet Hong Melvin, Josue Ortiz-Medina, Sajjad Ali, Teng Yang, Yoong Ahm Kim, Zhipeng Wang
Summary: Coupling graphene-based materials with SiC nanostructures is an effective strategy for improving photocatalytic CO2 reduction performance. In this study, vertical graphene (VG) sheets were synthesized on SiC nanowires derived from rice husks to form the VG@SiC/C composite. The resulting composite exhibited enhanced photocatalytic CO2 reduction, yielding CO and CH4 with yields of 25.5 and 2.3 μmol g-1 h-1, respectively, which is the highest CO yield among SiC-based photocatalysts. Defective VG sheets promoted sunlight absorption, CO2 adsorption and activation, electron-hole pair separation, and overall photocatalyst activity, leading to high CO2 reduction yield and selectivity.
Article
Multidisciplinary Sciences
Bai Yang Wang, Tiffany C. Wang, Yu-Te Hsu, Motoki Osada, Kyuho Lee, Chunjing Jia, Caitlin Duffy, Danfeng Li, Jennifer Fowlie, Malcolm R. Beasley, Thomas P. Devereaux, Ian R. Fisher, Nigel E. Hussey, Harold Y. Hwang
Summary: The search for superconductivity in infinite-layer nickelates, inspired by the cuprates, has encountered debates regarding the impact of varying rare-earth elements on these materials. In this study, we observe significant differences in the magnitude and anisotropy of the superconducting upper critical field across different rare-earth nickelates, namely La-, Pr-, and Nd-nickelates. These differences originate from the 4f electron characteristics of the rare-earth ions in the lattice, with La3+ being absent, Pr3+ being nonmagnetic, and Nd3+ being magnetic. The unique magnetoresistance found in Nd-nickelates can be attributed to the magnetic contribution of Nd3+ 4f moments. The robust and tunable superconductivity exhibited by these materials holds promise for future high-field applications.
Article
Materials Science, Multidisciplinary
Desman Perdamaian Gulo, Nguyen Tuan Hung, Raman Sankar, Riichiro Saito, Hsiang -Lin Liu
Summary: In this study, the optical properties of two-dimensional material molybdenum ditelluride (MoTe2) were investigated using spectroscopic ellipsometry. 2H-MoTe2 was found to have an indirect band gap and multiple distinct excitons, while 1T'-MoTe2 exhibited semimetal behavior with shifted and broadened optical transitions at higher temperatures.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Quantum Science & Technology
Fei Gao, Jianqi Huang, Weijun Ren, Hengheng Wu, Meng An, Xueliang Wu, Long Zhang, Tianran Yang, Aifeng Wang, Yisheng Chai, Xinguo Zhao, Teng Yang, Bing Li, Zhidong Zhang
Summary: This research investigates the magnetic properties, magneto-resistivity, Hall resistivity, Seebeck coefficient, and heat capacity of a magnetic topological nodal-line semimetal TbSbTe. The calculated energy-band structures show two nodal rings and a Fermi surface with electron and hole pockets. Multiple magnetic phase transitions occur at critical magnetic fields. The electrical resistivity shows a hump-like feature, a positive slope above a certain temperature, and a negative slope below that temperature. The magnetoresistance changes from a semi-classical H-2 dependence to a linear-field dependence, indicating a Dirac linear energy dispersion. TbSbTe may be used for studying topological physics and designing devices based on topological quantum materials.
ADVANCED QUANTUM TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
Lingli Li, Xiaoqi Li, Yizhuo Li, Biaohong Huang, Ji Qi, Khimananda Acharya, Lei Zhang, Zhaosheng Wang, Teng Yang, Zheng Han, Bing Li, Xiaoming Jiang, Tula R. Paudel, Weijin Hu, Zhidong Zhang
Summary: In this study, the crystal structure and electrical properties of a 2D hybrid perovskite (PVK-Br) were investigated, revealing consecutive phase transitions from ferroelectric-I (FE1) to ferroelectric-II (FE2) and then to antiferroelectric (AFE). Field-induced AFE to FE transition near room temperature enabled a large energy storage density of approximately 1.7 J cm(-3) and a wide working temperature span of about 70 K, both of which are among the best in hybrid AFEs. The good energy storage performance was attributed to the cooperative coupling between the [PbBr6] octahedral framework and the benzylamine molecules.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Jui-Han Fu, Jiacheng Min, Che-Kang Chang, Chien-Chih Tseng, Qingxiao Wang, Hayato Sugisaki, Chenyang Li, Yu-Ming Chang, Ibrahim Alnami, Wei-Ren Syong, Ci Lin, Feier Fang, Lv Zhao, Tzu-Hsuan Lo, Chao-Sung Lai, Wei-Sheng Chiu, Zih-Siang Jian, Wen-Hao Chang, Yu-Jung Lu, Kaimin Shih, Lain-Jong Li, Yi Wan, Yumeng Shi, Vincent Tung
Summary: The large-scale batch growth of single-crystal 2D semiconducting transition metal dichalcogenides (TMDs) is crucial for pushing the limits of semiconductor technology. This study demonstrates that the interaction between TMD grains and the exposed oxygen-aluminium atomic plane in sapphire plays a more dominant role than step-edge docking in controlling the single-crystal epitaxy of these materials. Reconstructing the surfaces of the sapphire substrate to a single type of atomic plane enables the epitaxial growth of TMDs without the aid of step edges.
NATURE NANOTECHNOLOGY
(2023)
Article
Multidisciplinary Sciences
M. Culo, S. Licciardello, K. Ishida, K. Mukasa, J. Ayres, J. Buhot, Y. T. Hsu, S. Imajo, M. W. Qiu, M. Saito, Y. Uezono, T. Otsuka, T. Watanabe, K. Kindo, T. Shibauchi, S. Kasahara, Y. Matsuda, N. E. Hussey
Summary: The authors present high-field magnetotransport measurements of FeSe1-xSx and FeSe1-xTex, which show a broad quantum vortex liquid regime. This indicates the presence of a quantum vortex liquid state and the destruction of the Abrikosov lattice by intense quantum fluctuations at very low temperatures.
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
Mingze Li, Dan Han, Zhenhua Wang, Bing Li, Teng Yang, Zhe Zhang, Fei Gao, Han Wang, Xinguo Zhao, Da Li, Zhidong Zhang
Summary: This study reports the magnetic and transport properties of the antiperovskite Eu3SnO, which is identified as a topological semimetal by first-principles calculations. A metastable canted antiferromagnetic state and anomalies in magnetoresistance and Hall resistance are observed. The coexistence of Eu2+ and Eu3+ is found, indicating dual properties of the f -orbital electrons. The phase diagram shows four magnetic-ordered regions and opens up possibilities for investigating antiferromagnetic topological semimetals.
PHYSICAL REVIEW MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Hsiang-Lin Liu, Bergitta Dwi Annawati, Nguyen Tuan Hung, Desman Perdamaian Gulo, Pablo Solis-Fernandez, Kenji Kawahara, Hiroki Ago, Riichiro Saito
Summary: Using spectroscopy ellipsometry, we studied the optical absorption spectra of monolayer and bilayer graphene in the deep-ultraviolet region up to 6.42 eV and their temperature dependence. The spectra can be fitted by two BWF functions, each originating from the interference of excitonic and surface plasmon spectra. The narrower linewidth and higher peak intensity with increasing temperature can be explained by the shorter lifetime of the surface plasmon at higher temperatures.
Article
Chemistry, Multidisciplinary
Dharmendra Verma, Bo Liu, Tsung-Cheng Chen, Lain-Jong Li, Chao-Sung Lai
Summary: The efficient photoresponse of Bi2O2Se with precisely tuned multiple optical wavelengths has been utilized for four diverse applications, including optoelectronic memory, associative learning, logic gates, and a binary to decimal converter. These applications demonstrate the importance of Bi2O2Se in future advanced multifunctional electronic systems.
NANOSCALE ADVANCES
(2022)
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)
