Article
Chemistry, Physical
Yiwei Zhao, Yan Li, Shuixiang He, Fei Ma
Summary: This study investigates the effects of charge injection and strain engineering on the phase transition in MoTe2-based devices through first-principles calculations. The results show that both methods can significantly lower the transition barrier and shorten the transition time, demonstrating potential for practical applications in modulating the phase transition in MoTe2-based devices.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Pengshang Zhou, Pieter Schiettecatte, Matthias Vandichel, Anastasia Rousaki, Peter Vandenabeele, Zeger Hens, Shalini Singh
Summary: The synthesis of transition-metal dichalcogenides (TMDs) using colloidal-chemistry approaches has attracted significant interest in recent years. This study demonstrated successful synthesis of nanocrystals with varied morphologies and properties by simply adjusting the ligands used during synthesis. Furthermore, the chemical reactions between precursors and ligands play a crucial role in determining the reaction outcome and surface chemistry of colloidal TMD nanocrystals.
CRYSTAL GROWTH & DESIGN
(2021)
Article
Chemistry, Multidisciplinary
Kuixin Zhu, Yiyin Tao, Daniel E. Clark, Wei Hong, Christina W. Li
Summary: Metal ion intercalation allows control over carrier transport properties in transition metal dichalcogenides. This study demonstrates a low-temperature, solution-phase method for intercalating cationic vanadium complexes into WS2. Vanadium intercalation expands the interlayer spacing and stabilizes the 1T' phase, resulting in a switch from p-type to n-type carrier transport and an increase in carrier mobility. The conductivity and thermal barrier can be tuned by adjusting the concentration of VCl3 during the cation-exchange reaction.
Article
Biochemical Research Methods
Tianqun Song, Qinglian Wang, Hongxia Yu, Wanting Gao, Yixin Xu, Yixin Lv, Yanzhi Xing, Yifeng Chen, Mei Yang
Summary: Transition metal dichalcogenide (TMD) dots, such as WS2 quantum dots (QDs), exhibit excellent photoluminescence performance and have been extensively applied in various fields. In this work, WS2 QDs were successfully prepared via a simple hydrothermal method and showed good stability and sensing capabilities for detecting hemoglobin (Hb) and myoglobin (Myo). The results indicate the potential of WS2 QDs for clinical diagnosis of Hb/Myo levels.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2022)
Article
Chemistry, Physical
A. Martinez-Jodar, S. Villar-Rodil, M. A. Salvado, D. F. Carrasco, P. Pertierra, J. M. Recio, J. I. Paredes
Summary: Two-dimensional MoSe2 nanosheets were found to have higher activity than MoS2 nanosheets as catalysts for nitroarene reduction in water treatment. Density functional theory (DFT) calculations revealed the reduction pathway on 2D MoSe2 and explained the selectivity displayed by the catalyst. The MoSe2 nanosheets were further coated with colloidal stabilizers and immobilized on polymer foam for practical application, showing no significant loss of activity after multiple catalytic cycles.
APPLIED CATALYSIS B-ENVIRONMENTAL
(2023)
Article
Chemistry, Multidisciplinary
Shuangyuan Pan, Min Hong, Lijie Zhu, Wenzhi Quan, Zehui Zhang, Yahuan Huan, Pengfei Yang, Fangfang Cui, Fan Zhou, Jingyi Hu, Feipeng Zheng, Yanfeng Zhang
Summary: This study reports the direct synthesis of mono- to few-layer Ni-tellurides, including 1T-NiTe2 and Ni-rich stoichiometric phases, on graphene/SiC substrates under ultra-high-vacuum conditions. Through atomic-scale scanning tunneling microscopy observations and density functional theory calculations, the researchers obtained detailed information about the phase modulation of Ni-tellurides and self-intercalated compounds. Additionally, the study also predicts the emergence of superconductivity in bilayer NiTe2 intercalated with 50% Ni.
Article
Nanoscience & Nanotechnology
Huanhuan Su, Shan Wu, Yuhan Yang, Qing Leng, Lei Huang, Junqi Fu, Qianjin Wang, Hui Liu, Lin Zhou
Summary: Research has found that the surface plasmon polariton (SPP)-assisted photoluminescence enhancement of MoS2 monolayer via a suspended periodic metallic (SPM) structure can achieve more than two orders of magnitude enhancement, primarily due to concentrated local field and quantum yield amplification. This method may provide a powerful way to boost two-dimensional exciton emission compared to nanoparticle-based geometries reported so far.
Article
Nanoscience & Nanotechnology
Huanhuan Su, Shan Wu, Yuhan Yang, Qing Leng, Lei Huang, Junqi Fu, Qianjin Wang, Hui Liu, Lin Zhou
Summary: In this study, a suspended periodic metallic (SPM) structure was used to achieve surface plasmon polariton (SPP)-assisted photoluminescence (PL) enhancement of MoS2 monolayer, providing more than two orders of magnitude enhancement without the need for metallic nanoparticle-based plasmonic geometries. The pronounced enhancement was attributed to concentrated local field of SPP enabled excitation rate increment and quantum yield amplification by the SPM nanostructure, showcasing a powerful way to boost two-dimensional exciton emission by plasmonic effects.
Article
Physics, Applied
Xuechao Feng, Jie Wu
Summary: We have studied the magnetic properties of transition metal intercalated niobium dichalcogenides CoNb3S6, NiNb3S6 and CuNb3S6. CoNb3S6 and NiNb3S6 exhibit antiferromagnetic ordering at low temperatures, while CuNb3S6 shows no magnetic phase transition throughout the temperature range.
JOURNAL OF SUPERCONDUCTIVITY AND NOVEL MAGNETISM
(2022)
Article
Chemistry, Inorganic & Nuclear
Filip Zechel, Peter Hutar, Viliam Vretenar, Karol Vegso, Peter Siffalovic, Milan Sykora
Summary: This study presents an alternative green route for the bottom-up synthesis of MoS2 nanoflakes (NFs) using colloidal synthesis. By utilizing low-toxic or non-toxic sulfur (S) precursors, single-layer MoS2 NFs with small lateral sizes and well-defined crystal structures were successfully synthesized. The evolution of the absorption spectra during the synthesis process reveals the influence of S precursors and coordinating ligands on the kinetics of NF formation.
INORGANIC CHEMISTRY
(2023)
Review
Chemistry, Physical
Zhifan Song, Zumin Wang, Ranbo Yu
Summary: This article introduces the basic knowledge and information of 2D transition metal dichalcogenides (2D TMDs) as electrode materials for supercapacitors (SCs), summarizes recent advances in strategies focusing on doping, structure, composition, phase, configuration, and electrolyte to improve their supercapacitor performance, and proposes future perspectives.
Review
Physics, Multidisciplinary
Siwen Zhao, Xiaoxi Li, Baojuan Dong, Huide Wang, Hanwen Wang, Yupeng Zhang, Zheng Han, Han Zhang
Summary: Achieving long valley lifetime is crucial in valleytronic devices; Strategies such as optical/magnetic/electric field tuning can be used to modulate valley degree of freedom; Two-dimensional valley-optoelectronic systems based on TMD heterostructures provide new opportunities for data processing and transmission.
REPORTS ON PROGRESS IN PHYSICS
(2021)
Review
Chemistry, Multidisciplinary
Jiajing Wu, Jing Peng, Haofeng Sun, Yuqiao Guo, Hongfei Liu, Changzheng Wu, Yi Xie
Summary: Intercalation chemistry plays a crucial role in solid-state physics and chemistry, enabling the modulation of electronic structures and the construction of new materials with unique properties. It has gained popularity in recent years in the synthesis and regulation of 2D transition metal dichalcogenides (TMDs), which have extensive applications in electronics, optoelectronics, and energy-based devices. In this review, the authors provide a comprehensive overview of recent advances in intercalation exfoliation of 2D TMD materials, focusing on the interactions between the host, guest, and solvent. The effect of intercalation chemistry on the synthesis and modification of TMD nanosheets is discussed, considering lattice strain, interlayer distance, and carrier density. The review concludes with a prospectus on future research opportunities in the intercalation chemistry of 2D materials.
ADVANCED MATERIALS
(2022)
Article
Chemistry, Physical
Yingwei Wang, Li Zhou, Mianzeng Zhong, Yanping Liu, Si Xiao, Jun He
Summary: The emerging subclass of noble-transition-metal dichalcogenides (NMDs) has sparked an increase in research on two-dimensional (2D) materials, featuring unique structures and useful properties. These 2D NMDs are promising candidates for a wide range of applications in optics, with discussions on their research status, structures, properties, synthesis, and potential applications, as well as insights into expected future developments.
Article
Physics, Condensed Matter
Haji Malekkheili Abdollah, Yuonesi Mohammad, Yaghoubi Mojtaba, Amani Alireza
Summary: This study investigates the electronic and thermoelectric properties of (5, 0) single-wall M (M = Hf, Zr) X2(X = S, Se, Te) nanotubes, finding that the band gap decreases with increasing chalcogen atomic size. It recommends choosing thermoelectric materials with high Seebeck coefficient and Figure of merit values in order to achieve good thermoelectric performance.
SOLID STATE COMMUNICATIONS
(2021)
Article
Chemistry, Multidisciplinary
Sang-Ho Chung, G. Hwan Park, Niels Schukkink, Hyoyoung Lee, N. Raveendran Shiju
Summary: The epoxidation of dicyclopentadiene (DCPD) was investigated on a series of TiO2 catalysts using hydrogen peroxide as an oxidant. DCPD derivatives find applications in various fields including polymers, pharmaceuticals, and pesticides. Ensuring selectivity for the desired product is crucial for these applications. Experimental and computational studies reveal the significant role of the crystalline phases of TiO2 on the formation of peroxo species and the selective epoxidation of the two different C=C double bonds in DCPD.
CHEMICAL COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Natarajan Sathiyamoorthy Venkataramanan, Ambigapathy Suvitha, Ryoji Sahara, Yoshiyuki Kawazoe
Summary: In this study, the formation of complexes between gemcitabine drug and host cucurbit[n]urils (Q[n]) was investigated using density functional theory (DFT). The most stable configuration was found to be a fully encapsulated complex. Thermodynamic parameters showed that the encapsulation process is spontaneous and driven by enthalpy. Molecular orbital analysis indicated that the encapsulation occurs through physical adsorption. Non-covalent interactions, including hydrogen bonding and C···F interactions, were responsible for stabilizing the complexes. The presence of steric repulsion and weak van der Waals interactions was observed.
STRUCTURAL CHEMISTRY
(2023)
Article
Chemistry, Multidisciplinary
Lingling Wang, Yang Liu, Hongdan Wang, Taehun Yang, Yongguang Luo, Seungeun Lee, Min Gyu Kim, Ta Thi Thuy Nga, Chung-Li Dong, Hyoyoung Lee
Summary: In this study, a vanadium single-atom-dimer (V-O-V) catalyst structure on N-doped carbon was proposed for the electrochemical nitrogen reduction reaction. The density functional theory calculation revealed a loop evolution of an intermediate structure in the V-O-V catalyst, which showed excellent electrochemical activity for nitrogen reduction.
Article
Chemistry, Physical
Mahnmin Choi, Meeree Kim, Yeunhee Lee, Taewan Kim, Jun Hyung Kim, Daekwon Shin, Jeong Won Kim, Yong-Hyun Kim, Sohee Jeong
Summary: The tunable band edge position of nonconductive colloidal quantum dot films is investigated using photo-electron spectroscopy and density functional theory calculations. The results show that the energy levels of nonconducting CQD films can be controlled by partially replacing the surface-bound ligand, providing a method for efficient optoelectronic device design.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Applied
Tung Thanh Ngo, Uyen Tu Thi Doan, Quyen Truc Thi Vo, Truong Lam Huynh, Nam Hoang Vu, Hanh Kieu Thi Ta, Le Thi Mai Hoa, Yoshiyuki Kawazoe, Phuong Tuyet Nguyen, Ngoc Kim Pham
Summary: In this study, a thin film of methylammonium lead iodide (MAPbI(3)) was used as a switching layer in metal/MAPbI(3)/FTO devices, with Ag and Cr used as active and inert top electrodes, respectively. The Ag/MAPbI(3)/FTO structure displayed digital bipolar resistive switching (RS) behavior, while the Cr/MAPbI(3)/FTO device displayed analog RS behavior. Density functional theory simulations indicated that the different behaviors may be due to the interaction between the iodine vacancy defect and the metal contact properties. The findings suggest that organic-inorganic hybrid perovskite has potential for data storage.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Biochemistry & Molecular Biology
Rodion V. Belosludov, Kirill V. Gets, Ravil K. Zhdanov, Yulia Y. Bozhko, Vladimir R. Belosludov, Li-Jen Chen, Yoshiyuki Kawazoe
Summary: Using molecular dynamics, the behavior of a metastable solution of methane + water was studied for different concentrations at low pressure. The formation of hydrate-like structures was observed at certain concentrations, suggesting a new mechanism of hydrogen-bond network reorganization that leads to hydrate growth. This study reveals the importance of supersaturation and cavity arrangement in the collective process of hydrate formation.
Article
Multidisciplinary Sciences
Yu Jin Jang, Kamal Kumar Paul, Jin Cheol Park, Meeree Kim, Minh Dao Tran, Hyun Yong Song, Seok Joon Yun, Hyoyoung Lee, Temujin Enkhbat, JunHo Kim, Young Hee Lee, Ji-Hee Kim
Summary: Organic systems can convert a initially excited singlet spin state into two triplet spin states, which allows for efficient conversion of triplet excitons into charge carriers. By using a molybdenum ditelluride (MoTe2)/pentacene heterostructure, we demonstrate efficient triplet transfer from pentacene to MoTe2, leading to a nearly four times increase in carrier density. This study also shows doubled carriers in MoTe2 via inverse Auger process and doubled carriers via triplet extraction from pentacene, indicating enhanced photovoltaic conversion efficiency beyond the Shockley-Queisser (S-Q) limit in organic/inorganic heterostructures.
Article
Chemistry, Multidisciplinary
Sunghu Kim, Seongmin Park, Meeree Kim, Sohee Jeong
Summary: Single-crystalline indium phosphide (InP) tetrapods were synthesized and proved to be a useful platform for studying multiple exciton behaviors. ZnCl2 precursor was used to enhance the optical performance of InP tetrapods, but no distinct enhancement in photoluminescence was observed. However, further shell growth on InP-ZnCl2 successfully preserved tetrapodal geometry and showed higher photoluminescence than tetrapodal InP/ZnSe. The crystal structure of InP-ZnCl2 was retained even with various Zn feed ratios.
BULLETIN OF THE KOREAN CHEMICAL SOCIETY
(2023)
Article
Nanoscience & Nanotechnology
Rence Painappallil Reji, Sarath Kumar Chedharla Balaji, Yuvaraj Sivalingam, Yoshiyuki Kawazoe, Surya Velappa Jayaraman
Summary: This study investigates the sensing capability of Sc2CO2 MXene nanosheets for volatile organic compounds (VOCs) in exhaled breath, which could potentially serve as biomarkers for physiological disorders. The results show that Sc2CO2 has a higher interaction with 2-propanol, ethanol, and acetonitrile. The chemiresistive sensor behavior reveals that Sc2CO2 is highly sensitive to acetonitrile, while the change in work function of Sc2CO2 nanosheets indicates sensitivity to toluene and isoprene. This research suggests that Sc2CO2 MXene nanosheets can be used as dual-mode sensors for the detection of VOC biomarkers in exhaled breath.
ACS APPLIED NANO MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Jiahui Liu, Shuo Wang, Yoshiyuki Kawazoe, Qiang Sun
Summary: In this study, a new spinel chloride (Na2Y2/3Cl4) was investigated as a solid electrolyte for all-solid-state sodium-ion batteries. The spinel Na2Y2/3Cl4 exhibited high ionic conductivity and excellent electrochemical stability. Moreover, it has a wide electrochemical window and good interfacial stability, making it a promising candidate for improving the energy density of ASIBs.
ACS MATERIALS LETTERS
(2023)
Review
Chemistry, Multidisciplinary
Mengfang Liang, Xiaodong Shao, Hyoyoung Lee
Summary: Ammonia plays a vital role in fertilizer production, hydrogen storage, and alternative fuels. Conventional methods for ammonia production are energy-intensive and harmful to the environment. The development of environmentally friendly and low-energy consumption strategies for electrocatalytic N2 reduction reaction (ENRR) in mild conditions is of great importance. Recently, dual single-atom catalysts (DSACs) have emerged as a promising solution for the activation of molecular N2, providing diverse active sites and synergistic interactions between adjacent atoms. This review summarizes the latest advances in metal DSACs for electrochemical ENRR, including their variety, coordination, support, N2 adsorption and activity mechanisms, as well as the characterization of NRR and electrochemical cell configuration. The challenges and prospects in this rapidly evolving field are also addressed.
CHEMISTRY-A EUROPEAN JOURNAL
(2023)
Article
Chemistry, Multidisciplinary
Byungwook Ahn, Yoonsok Kim, Meeree Kim, Hyang Mi Yu, Jaehun Ahn, Eunji Sim, Hyunjin Ji, Hamza Zad Gul, Keun Soo Kim, Kyuwook Ihm, Hyoyoung Lee, Eun Kyu Kim, Seong Chu Lim
Summary: Transition metal dichalcogenides (TMDs) have unique electrical properties, but their performance is affected by defect sites. This study introduces a single treatment method to remove defects in multilayer MoS2 FET, resulting in enhanced carrier mobility.
Review
Chemistry, Multidisciplinary
Jungsue Choi, Sohyeon Seo, Minsu Kim, Yeonsu Han, Xiaodong Shao, Hyoyoung Lee
Summary: Atomic-scale electrocatalysts for water splitting require adjustments of the supporting structures to anchor and disperse metal single atoms, and their structural properties play a critical role in creating different environments for electrocatalytic activity. The coordination environment to the single-atom active site from the supporting material energetically stabilizes the rate-determining step or intermediate state for hydrogen or oxygen evolution reactions. Increasing the loading amount of metal single atoms maximizes the efficiency and reduces the cost of the electrocatalyst in large-scale practical use. Dual-atom electrocatalysts with different single-atom active sites react with more water molecules and lower the adsorption energy of water by utilizing the difference in electronegativity between the two metal atoms. Single-atom dimers induce asymmetric active sites that promote the degradation of H2O to H-2 or O-2 evolution.
Article
Chemistry, Multidisciplinary
Chenxin Zhang, Jie Sun, Yiheng Shen, Cunzhi Zhang, Qian Wang, Akira Yoshikawa, Yoshiyuki Kawazoe, Puru Jena
Summary: Twisting in layered materials can effectively tune the interactions between particles or quasi-particles. In this study, the response of phonon coherence in bilayer penta-NiN2 to twisting is investigated, using the unified theory of phonon transport and high order lattice anharmonicity, as well as the self-consistent phonon theory. The results show that twisting reduces the lattice thermal conductivity by 80.6% and increases the contribution of phonon coherence by an order of magnitude. This work provides fundamental insights into the phonon interaction in twisted pentagonal sheets.
Article
Nanoscience & Nanotechnology
Kim My Tran, Junoh Shim, Hyung-Kun Lee, Sohyeon Seo, Surajit Haldar, Hyoyoung Lee
Summary: An ultrasensitive CO gas sensor operating at room temperature using fluorine-graphdiyne (F-GDY) has been developed. The sensor utilizes light to increase electron levels in F-GDY, resulting in enhanced CO sensitivity. The study demonstrates that F-GDY is highly sensitive to electron-deficient CO gases.
ACS APPLIED MATERIALS & INTERFACES
(2023)