Article
Chemistry, Multidisciplinary
Yatian Zhang, Zhen Tong, Alessandro Pecchia, ChiYung Yam, Traian Dumitrica, Thomas Frauenheim
Summary: The thermal transport characteristics of monolayer trigonal prismatic tantalum disulfide were investigated using first-principles calculations and the Boltzmann transport equation. It was found that four-phonon scattering and phonon-electron scattering significantly reduced the thermal conductivity. The study also revealed differences in the electronic thermal conductivity estimation and provided new insights into the physical mechanisms of thermal transport in metallic 2D systems.
Article
Chemistry, Multidisciplinary
Enquan Jin, Keyu Geng, Shuai Fu, Sheng Yang, Narissa Kanlayakan, Matthew A. Addicoat, Nawee Kungwan, Johannes Geurs, Hong Xu, Mischa Bonn, Hai Wang, Jurgen Smet, Tim Kowalczyk, Donglin Jiang
Summary: The study reports a method to develop high-rate n-type semiconductors with exceptional electron mobility. This approach shows promise in enhancing the performance of organic/polymeric semiconductors.
Article
Chemistry, Multidisciplinary
Jie Li, Yu Liu, Linke Yu, Haihong Meng, Jinxing Gu, Fengyu Li
Summary: Based on M-4-square-containing metal clusters, we designed two-dimensional M2Li sheets and confirmed the stability and mechanical properties of four M2Li-I monolayers. Ag2Li-I shows great promise as an electrocatalyst for CO2 reduction.
Article
Physics, Applied
Aditya Dash, Dorothea Scheunemann, Martijn Kemerink
Summary: This study presents a unified model to explain charge and energy transport in networks of semiconducting single-walled carbon nanotubes. By using the steady-state master equation and the Boltzmann-transport formalism, the electrical and thermoelectric properties of the network, including conductivity, Seebeck coefficient, and electronic contribution to thermal conductivity, can be obtained. The model provides a consistent description of previously published experimental data and offers insights for improving the thermoelectric efficiency of the networks.
PHYSICAL REVIEW APPLIED
(2022)
Review
Chemistry, Multidisciplinary
Hongda Li, Chenpu Li, Boran Tao, Shaonan Gu, Yuanmiao Xie, Hao Wu, Gaojie Zhang, Guofu Wang, Wenfeng Zhang, Haixin Chang
Summary: This review presents recent advances in the preparation, physical properties, and applications of atom-thick 2D metal telluride atomic crystals (2D MTACs), including available preparation methods, abundant physical properties, potential applications in electronics, spintronics, optoelectronics, and energy, as well as significant challenges and opportunities in the field.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Chemistry, Organic
Bruno Salgues, Rudraditya Sarkar, Muhammad Luthfi Fajri, Yatzil Alejandra Avalos-Quiroz, Anne-Doriane Manick, Michel Giorgi, Nicolas Vanthuyne, Yannick Carissan, Christine Videlot-Ackermann, Jorg Ackermann, Gabriel Canard, Jean-Luc Parrain, Boris Le Guennic, Denis Jacquemin, Muriel Amatore, Laurent Commeiras, Elena Zaborova, Frederic Fages
Summary: The novel di(benz[f]indenone)-fused tetraazaanthracene derivative synthesized in this study showed strong electron-accepting character, making it attractive for the generation of n-channel semiconducting materials. It exhibited electron transport in organic field effect transistors and demonstrated potential as an electron acceptor material in organic solar cells.
JOURNAL OF ORGANIC CHEMISTRY
(2022)
Article
Geosciences, Multidisciplinary
Lingyun Kong, Fahimeh Hadavimoghaddam, Chunxiao Li, Kouqi Liu, Bo Liu, Amir Semnani, Mehdi Ostadhassan
Summary: This study compares the feasibility of using force spectroscopy methods and nanoindentation techniques to obtain elastic properties of shale. It was found that the modulus range in nanoindentation data is larger, but it becomes more difficult to identify organic matter from intermediary phases as thermal maturity increases. In contrast, AFM provides higher resolution modulus maps, allowing for more accurate distinction between different phases.
MARINE AND PETROLEUM GEOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Jianwei Zhou, Fangfang Duo, Chubei Wang, Liangliang Chu, Mingliang Zhang, Donglei Yan
Summary: In this study, defect intrinsic hexagonal boron nitride (h-BN) quantum sheets (QS) and bismuth oxide (Bi2O3) QS were prepared from bulk materials by ball milling and solvent stripping, respectively. The h-BN/Bi2O3 heterostructure was fabricated via a facile self-assembly method. The introduction of h-BN QS significantly enhanced the photocatalytic activity of h-BN/Bi2O3, improving the separation efficiency of photogenerated carriers.
Article
Engineering, Biomedical
Andreas Stylianou, Fotios Mpekris, Chrysovalantis Voutouri, Antonia Papoui, Anastasia Constantinidou, Evros Kitiris, Michalis Kailides, Triantafyllos Stylianopoulos
Summary: Tumors undergo mechanical property changes during cancer progression, and targeting components of the tumor microenvironment to normalize tumor mechanical properties can enhance drug delivery. Atomic Force Microscopy (AFM) was used to assess nanomechanical properties of tumor biopsies, showing sensitivity to changes in tumor mechanical properties during treatment. This has the potential to develop biomarkers for treatment prediction and monitoring.
ACTA BIOMATERIALIA
(2022)
Article
Chemistry, Physical
Yue Liu, Peng Liu, Huixia Lei, Yuanyuan Qu, Yang Tan, Feng Chen
Summary: This study investigates the unidirectional charge transport mechanism at the defect boundary and successfully constructs a high-performance self-powered photodetector.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Multidisciplinary
Tugbey Kocabas, Murat Keceli, Alvaro Vazquez-Mayagoitia, Cem Sevik
Summary: Two-dimensional materials (2DMs) are highly sought after due to their extreme flexibility and superior thermal properties. This study presents a systematic method to develop Gaussian approximation potentials for selected 2DMs and validates the accuracy of the potentials through various calculations. The results demonstrate that these potentials provide an accurate description of interatomic interactions and are successful in high-temperature simulations.
Article
Chemistry, Physical
Miles F. Beaux, Reuben J. Peterson, Igor O. Usov
Summary: Atomic force microscopy was used to map the topography and qualitative mechanical characteristics of gallium-stabilized delta-phase plutonium coupons. The initial rough and heterogeneous surface of plutonium was observed, along with distinct striation patterns in qualitative nanomechanical mapping. Investigation suggested that the striations were not measurement artifacts or plutonium-specific features, and were influenced by mechanical working of the surface.
SURFACES AND INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Wanxin Lv, Yuzhou Hao, Aojie Li, Xiaoliang Zhong
Summary: The study focuses on the Young's moduli of ultrathin oxygen-adsorbed 2D Pt slabs with a (111) surface using density functional theory methods. It shows that the Young's moduli typically decrease as surface oxygen coverage increases, and thinner slabs generally exhibit higher stiffness. The nonlinear elastic properties of both the core and surface regions of the considered 2D structures contribute to the overall effective elastic properties.
Article
Physics, Multidisciplinary
Hossein Asnaashari Eivari, Roohollah Hafizi
Summary: This study investigates the mechanical properties of two different 2D TiO2 nanosheets and compares their responses under strain. It is found that the hexagonal nanosheet is softer than the lepidocrocite nanosheet, and the reason for this difference is analyzed through structural differences. Additionally, the study reveals that both nanosheets exhibit linear responses under small tensile strains.
EUROPEAN PHYSICAL JOURNAL PLUS
(2022)
Article
Engineering, Electrical & Electronic
Allen Jian Yang, Kun Han, Ke Huang, Chen Ye, Wen Wen, Ruixue Zhu, Rui Zhu, Jun Xu, Ting Yu, Peng Gao, Qihua Xiong, X. Renshaw Wang
Summary: High-performance field-effect transistors made of n-type molybdenum disulfide and p-type tungsten diselenide can be fabricated using single-crystal strontium titanate dielectrics and van der Waals forces. This integration provides a promising approach for building next-generation electronic devices with ultrascaled channel lengths.
NATURE ELECTRONICS
(2022)
Article
Biochemistry & Molecular Biology
Young Jae Kim, Daeho Kim, Yongman Kim, Yongchan Jeong, Beomgyun Jeong, Jeong Young Park
Summary: The catalytic properties of copper-based catalysts depend on the oxidation states of Cu. This study utilized near-ambient pressure scanning tunneling microscopy (NAP-STM) and near-ambient pressure X-ray photoelectron spectroscopy (NAP-XPS) to observe the oxidation processes of Cu(111) in real time. Dry oxidation started at the step edges and proceeded to the terraces as a Cu2O phase, while humid oxidation showed Cu2O generation at upper steps. The difference in oxidation mechanisms was attributed to the presence of water molecules.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Physical
Hyunhwa Lee, Passarut Boonmongkolras, Seongmoon Jun, Daehan Kim, Yujin Park, Jaehyuk Koh, Yong-Hoon Cho, Byungha Shin, Jeong Young Park
Summary: Mixed-halide perovskites show tunable optical properties and have potential applications in optoelectronics, but the phase segregation caused by halide ion migration hinders stable performance in solar cells. By conducting comprehensive measurements, we have revealed the mechanism of ion migration and observed that iodide ions predominantly cause halide segregation. The changes in band bending at grain boundaries indicate the migration of iodide ions towards grain boundaries and their influence on the formation of iodine-rich phases. This study provides insights into the mechanism of light-halide ion interactions.
ACS APPLIED ENERGY MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Kasala Prabhakar Reddy, Daeho Kim, Seunghwa Hong, Ki-Jeong Kim, Ryong Ryoo, Jeong Young Park
Summary: Modifying the electronic structure of nickel-based catalysts is a promising strategy to tune the selectivity of CO2 hydrogenation. In this study, well dispersed Cu-Ni bimetallic nanoparticles were synthesized and used for selective CO2 hydrogenation. The Cu0.5Ni0.5/gamma-Al2O3 catalyst exhibited higher CO2 conversion and CO selectivity compared to monometallic catalysts.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Yongman Kim, Joong Il Jake Choi, Yongchan Jeong, Young Jae Kim, Jeong Young Park
Summary: This paper presents the design and performances of a beetle-type electrochemical scanning tunneling microscope (EC-STM) that allows horizontal tip motion at a millimeter range. The symmetrical scanner design of the beetle-type EC-STM reduces thermal drift and enables operation in various chemical reactions. Atom-resolved high-resolution scanning tunneling microscope images of highly oriented pyrolytic graphite (HOPG) and Au(111) surfaces in the liquid phase demonstrate the scan performance of the beetle-type EC-STM, which also provides real-time information on the electrode surface during electrochemical reactions.
CURRENT APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Gyuho Han, Hee Chan Song, Sang Hoon Kim, Jeong Young Park
Summary: The interaction between metal and support significantly enhances catalytic activity. In this study, the effect of the support's oxidation state on the metal-support interaction (MSI) in two-dimensional Pt/TiOx catalysts was investigated. Pt nanoparticles were deposited on titanium oxide supports with five different oxidation states using arc plasma deposition, and CO oxidation reaction was accurately performed in a batch reactor. It was confirmed that the catalyst with the highest oxidation state of the support exhibited the best catalytic activity. The Mars-van Krevelen mechanism at the metal-oxide interface was affected by the oxidation states of the supports, and the compositional effects of the support were confirmed by X-ray photoelectron spectroscopy analysis.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Physical
Seunghwa Hong, Daeho Kim, Ki-Jeong Kim, Jeong Young Park
Summary: The metal-support interaction is crucial for determining the catalytic activity of supported metal catalysts. The facet of the support plays a role in catalytic control via constructing a well-defined metal-support nanostructure. In this study, cubic and octahedral Cu2O supports with different facets were developed, and Pt nanoparticles were introduced. The in situ characterizations revealed that the facet-dependent encapsulation of the Pt nanoparticles by a CuO layer affected the catalytic performance.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Multidisciplinary Sciences
Jeongjin Kim, Youngseok Yu, Tae Won Go, Jean-Jacques Gallet, Fabrice Bournel, Bongjin Simon Mun, Jeong Young Park
Summary: By conducting experiments, it has been observed that there is an evolution of step-broken Cu nanoclusters on the Cu surface under CO2 atmosphere. The study reveals the correlation between CO2 conversion and morphology structure, with CO and atomic oxygen inducing complicated restructuring of Cu atoms. The changes in chemical binding energy in CO-Cu complexes have been quantitatively studied using synchrotron-based ambient pressure X-ray photoelectron spectroscopy.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Daeho Kim, Dongmin Park, Hee Chan Song, Beomgyun Jeong, Jouhahn Lee, Yousung Jung, Jeong Young Park
Summary: The strong metal-support interaction (SMSI) has a significant impact on the catalytic performance of supported metal catalysts, playing a central role in the modern chemical industry. However, understanding SMSI under realistic conditions remains challenging. This study provides evidence of SMSI between Pt and Co3O4 using both three-dimensional and two-dimensional model catalysts. The presence of Pt-Co3O4 interface, demonstrated by the formation of a Co3O4 overlayer on Pt nanoparticles, enhances catalytic activity and offers insights for designing high-performance heterogeneous catalysts.
Article
Nanoscience & Nanotechnology
Beomjoon Jeon, Daeho Kim, Taek-Seung Kim, Han-Koo Lee, Jeong Young Park
Summary: This study investigates the correlation between catalytic synergy and hot electron chemistry in Au-Pd bimetallic nanoparticles. The formation of Au/PdOx interfaces on the bimetallic catalysts enhances their catalytic activity. By engineering the metal-oxide interfaces, the rate of hot electron formation can be observed.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Applied
Jeong-Chul Kim, John Lee, Seung Won Han, Hongjun Park, Hanyoung Park, Jeong Young Park, Ryong Ryoo
Summary: Investigated the transformation of PtY/MZ catalyst from powder form to industrial pellets. Addition of 20 wt% of pseudo-boehmite as a binder resulted in the highest mechanical strength and catalytic activity. Demonstrated the use of other non-acidic binders.
MICROPOROUS AND MESOPOROUS MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Dooho Lee, Hochan Jeong, Hyunsoo Lee, Yong-Hyun Kim, Jeong Young Park
Summary: The fundamental aspects of energy dissipation on 2D atomic layers, specifically transition metal dichalcogenides (TMDs) in different phases, have been investigated. The nanotribological properties of 2H and 1T' phase MoS2 and MoTe2 atomic layers were studied using AFM/FFM, and the 1T' phase exhibited significantly higher friction than the 2H phase. This increase in friction was attributed to enhanced electronic excitation, efficient phonon dissipation, and increased potential energy surface barrier at the tip-sample interface. This study suggests the possibility of tuning friction in TMDs through phase transition for potential applications in tunable tribological devices.
Article
Chemistry, Physical
Yejin Song, Daeho Kim, Seunghwa Hong, Taek-Seung Kim, Ki-Jeong Kim, Jeong Young Park
Summary: The formation and impact of the Pt-CoO interface on Pt-Co bimetallic NPs were investigated, revealing that the interfacial structures play a key role in enhancing catalytic activity.
Article
Chemistry, Physical
Hanyoung Park, Jisuk Bang, Hongjun Park, Jaeheon Kim, Jeong-Chul Kim, Jeong Young Park, Ryong Ryoo
Summary: Silanol groups were generated in siliceous MFI zeolite nanosheets for catalytic application in gas-phase Beckmann rearrangement. The catalytic conversion was studied at 310 or 350 degrees C with different oxime reactants. The presence of silanol nests was found to be necessary for the conversion of certain oximes, while isolated silanols on the external surface were sufficient for others.
CATALYSIS SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Yongchan Jeong, Yongman Kim, Young Jae Kim, Jeong Young Park
Summary: This study performed in situ measurement of a CO2 reduction reaction in Cu-phthalocyanine molecules adsorbed on an Au surface using electrochemical scanning tunneling microscopy. The researchers observed the restructuring of the CuPC adlayer into unexpected nanoclusters during CO2RR, which showed catalytic activity. The nanoclusters were identified as Cu complexes based on X-ray photoelectron spectroscopy. The study provides insights into the surface-reactive correlations and suggests the use of CuPC-derived Cu nanoclusters as active species for CO2RR catalyst at a relatively low potential.
Review
Chemistry, Physical
Yongman Kim, Young Jae Kim, Jeong Young Park
Summary: Scanning tunneling microscopy (STM) plays a key role in studying surface and interfacial chemistry. Recent advances in operando STM techniques, specifically in solid-liquid and solid-gas interfaces, as well as electrochemical STM research, have provided insights into atomic features and reaction mechanisms under various conditions, with implications for future research.
CHEMICAL PHYSICS REVIEWS
(2023)
