Article
Materials Science, Multidisciplinary
Ki Hoon Shin, Ji Yong Bae, Su Yong Lee, Docheon Ahn, Jiung Cho, Jongwon Yoon, Woong-Ki Hong, Jung Inn Sohn
Summary: In this study, stress engineering on MIT in VO2 nanobeams is achieved through core-shell heterostructures, enabling uniform axial stress distribution and control of phase transition pathways. This research can lead to better engineering of phase transitions in strongly correlated materials, providing the beneficial effect of suppressing inhomogeneities during the MIT process.
APPLIED MATERIALS TODAY
(2021)
Article
Chemistry, Physical
Hsaio-Wen Chen, Chien- Li, Chun-Hao Ma, Ying-Hao Chu, Hsiang-Lin Liu
Summary: This paper investigates the influence of uniaxial mechanical strain on the optical properties of VO2/muscovite heterostructures. Results show linear shifts in peak positions of Raman-active phonon modes under applied strain, as well as significant changes in the metal-insulator transition temperature. The modulation of optical properties through strain engineering presents new opportunities for flexible and tunable photonic devices.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Materials Science, Ceramics
Fang Chen, Le Yuan, Xueyu Wu, Yuxi Huang, Yaqing Wang, Xiaolong Weng
Summary: An intelligent infrared camouflage material with adaptable infrared radiation characteristic to environmental temperature changes was developed in this study by preparing Mo-doped VO2 powder. The effects of Mo6+ doping concentration on the structure, morphology, composition, phase transition temperature, and infrared reflectivity of VO2 powder were analyzed. The results showed that Mo6+ doping effectively reduced the phase transition temperature and increased the change range of infrared emissivity before and after the metal-to-insulator transition of VO2.
CERAMICS INTERNATIONAL
(2023)
Article
Physics, Applied
Lun Zhong, Mengdie Li, Shuangjing Yan, Wenjing Jie
Summary: In this study, two-dimensional vanadium telluride (VTe2) nanosheets were prepared by chemical vapor deposition, showing metal-to-insulator transition (MIT) behavior and threshold switching (TS) characteristics. The synthesized VTe2 nanosheets exhibited good stability and reliability with up to 1000 continuous writing/erasing operations. Additionally, the TS behavior allowed the fabricated memristor to perform basic Boolean logic operations of OR, AND, and NOT. This research not only demonstrated the TS behavior of 2D VTe2 nanosheets due to the MIT phase transition but also showcased the potential applications of TS devices in Boolean logic operations.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Sivacarendran Balendhran, Mohammad Taha, Shifan Wang, Wei Yan, Naoki Higashitarumizu, Dingchen Wen, Nima Sefidmooye Azar, James Bullock, Paul Mulvaney, Ali Javey, Kenneth B. Crozier
Summary: Flexible optoelectronics is a rapidly growing field with a wide range of potential applications, but current devices have limitations in their spectral range. This study demonstrates flexible photodetectors using a VOx nanoparticle ink, with an extremely broad operating wavelength range of 0.4 to 20 μm. These devices show mechanical flexibility, wide spectral response, and ease of fabrication, making them highly desirable for various applications.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Multidisciplinary Sciences
Jiyu Xu, Daqiang Chen, Sheng Meng
Summary: Photoexcitation has been proven as an efficient way to trigger phase transitions in strongly correlated materials. However, the atomistic mechanisms behind the structural phase transitions (SPTs) and electronic insulator-metal transitions (IMTs) in VO2 have been controversial. This study clarifies some key controversies and provides insights into the underlying atomistic processes and decoupling nature of photoinduced SPT and IMT in nonequilibrium states.
Review
Chemistry, Multidisciplinary
Qianying Tang, Fang Zhong, Qing Li, Jialu Weng, Junzhe Li, Hangyu Lu, Haitao Wu, Shuning Liu, Jiacheng Wang, Ke Deng, Yunlong Xiao, Zhen Wang, Ting He
Summary: An infrared photodetector serves as a critical component in various fields such as national defense, military, communications, and astronomy. The emergence of 2D materials offers new possibilities for developing next-generation infrared detectors, but challenges such as thickness limitations and immature preparation techniques still exist.
Article
Physics, Applied
L. M. B. Vargas, K. Bolanos, M. J. da Silva, S. de Castro, M. L. Peres, M. P. F. de Godoy
Summary: We systematically investigated the morphology and magnetotransport properties of Zn1-xCdxO/CdO heterostructures by changing the x values between 0.50 and 0.95. The disorder degree was found to be correlated with the amplitude of the negative magnetoresistance and the dominant inelastic scattering mechanisms. All heterostructures showed a negative amplitude in magnetoresistance measurements, indicating the presence of weak localization effect at low temperatures. Using the three-dimensional weak localization theory (Kawabata 3D), we determined a relatively large phase coherence length (up to 135 nm at 4.2 K) for the Zn0.05Cd0.95O/CdO heterostructure.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Multidisciplinary Sciences
Jan O. Schunck, Florian Doering, Benedikt Roesner, Jens Buck, Robin Y. Engel, Piter S. Miedema, Sanjoy K. Mahatha, Moritz Hoesch, Adrian Petraru, Hermann Kohlstedt, Christian Schuessler-Langeheine, Kai Rossnagel, Christian David, Martin Beye
Summary: This study demonstrates the use of imaging soft X-ray absorption spectroscopy to investigate the insulator-metal transition in vanadium dioxide thin-film microstructures. The experimental results show that the transition temperature for the conversion from insulating to metallic vanadium dioxide is lower near the structure edges compared to the center. The technique provides a detailed understanding of the relationship between the electronic properties of quantum materials and their patterning at the micrometer scale.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
N. B. Devlin, T. Ferrus, C. H. W. Barnes
Summary: This study explores the emergence of spin-polarized flat bands at head-to-head domain walls in topological insulator heterostructures. By tuning the width of the domain wall, the functional form of bound states can be controlled. The number of layers in a multilayer sample affects the electronic dispersion, with odd-layer samples exhibiting particle-hole symmetry and linearly dispersing topologically nontrivial states around E=0, while even-layer samples lack such symmetry and result in a gapped system with spin-polarized flat bands.
Article
Materials Science, Multidisciplinary
Yanqing Zhang, Qian He, Weijin Chen, Zhiyuan Tang, Weiming Xiong, Yi Zhang, Linjie Liu, Xin Luo, Yue Zheng
Summary: This study explores the mechanical creation of intriguing heterophase domain patterns in vanadium dioxide using tip pressing forces, and demonstrates the influence of these patterns on electronic transport behavior. It also showcases potential device concepts based on the induced heterophase domain patterns.
Article
Materials Science, Multidisciplinary
Waldemar Gawron, Jan Sobieski, Tetiana Manyk, Malgorzata Kopytko, Pawel Madejczyk, Jaroslaw Rutkowski
Summary: This paper presents the current status of medium-wave infrared (MWIR) detectors at the Military University of Technology's Institute of Applied Physics and VIGO System S.A., highlighting the successful application of metal-organic chemical vapor deposition (MOCVD) technique for the growth of high-quality HgCdTe epilayers on low-cost GaAs wafers. The unique aspect of the technology lies in the lack of the necessity of time-consuming and troublesome ex situ annealing, providing new possibilities for uncooled infrared detectors.
Article
Chemistry, Multidisciplinary
Sergey Mutilin, Victor Ya Prinz, Lyubov Yakovkina, Anton K. Gutakovskii
Summary: This study developed a strategy for the formation of hybrid Si/VO2 nanostructures compatible with standard silicon technology, based on selective synthesis of VO2 crystals on 3D silicon structures. The method allows for precise arrays of VO2 nanorings on silicon cylinders, opening up possibilities for post-silicon optoelectronics and neuromorphic circuits.
Article
Materials Science, Multidisciplinary
N. Pournaghavi, M. F. Islam, Rajibul Islam, Carmine Autieri, Tomasz Dietl, C. M. Canali
Summary: Breaking time-reversal symmetry in three-dimensional topological insulator thin films can lead to different topological quantum phases, such as the Chern insulator (CI) phase and the axion insulator (AI) phase. Investigating a trilayer heterostructure composed of a Bi2Se3 (Bi2Te3) TI thin film sandwiched between two antiferromagnetic MnTe layers using first-principles density functional theory methods reveals the onset of these two topological phases. The study also discusses the possibility of inducing transitions between the CI and the AI phases through the spin-orbit torque caused by the spin Hall effect in an adjacent conducting layer.
Article
Chemistry, Physical
Dooyong Lee, Taewon Min, Jiwoong Kim, Sehwan Song, Jisung Lee, Haeyong Kang, Jouhahn Lee, Deok-Yong Cho, Jaekwang Lee, Jae Hyuck Jang, Sungkyun Park
Summary: The study found that octahedral symmetry in VO2 can control its IMT characteristics by changing orbital occupancy, and monoclinic VO2 with high octahedral symmetry exhibits bandwidth-controlled IMT characteristics.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Multidisciplinary Sciences
Jing Peng, Haofeng Sun, Kun Ni, Jiajing Wu, Xinyu Sun, Yueqi Su, Han Cheng, Yuhua Liu, Yuqiao Guo, Wentuan Bi, Yanwu Zhu, Changzheng Wu, Yi Xie
Summary: Acidic water electrolysis is important for renewable energy development, but there is a trade-off between high activity and long lifespan for oxygen evolution catalysts. We have demonstrated a new oxygen evolution model catalyst, hierarchical palladium (Pd), with superior performance compared to iridium- and ruthenium-based materials.
NATIONAL SCIENCE REVIEW
(2023)
Article
Chemistry, Multidisciplinary
Baohu Dai, Changzheng Wu, Yi Xie
Summary: The role of structure imperfections on the performance of electrochromic transition metal oxide (ETMO) was investigated. It was found that structure imperfections hinder the ion shuttling speed, resulting in a lower response rate. By dividing the ion accommodation sites into normal sites and abnormal sites, the reasons for non-linear coloration and rate capability loss were explained.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Biochemistry & Molecular Biology
Zhi Zhang, Yi Wang, Zelin Zhao, Weijing Song, Xiaoli Zhou, Zejun Li
Summary: Two-dimensional metal chalcogenides (2D-MCs) exhibit various phase transition behaviors, such as superconductivity, charge density wave (CDW), and magnetic transitions, which can be modulated through interlayer chemical modification. This method provides confined space, strong guest-host interactions, and local and reversible modulation without damaging the host lattice, leading to new phenomena and functionalities. In this review, recent advances in interlayer chemical modulation of 2D-MCs are discussed, including the effects of charge transfer, spin coupling, and lattice strain on phase transitions. The prospects and challenges of interlayer chemical modulation for future research are also pointed out.
Article
Nanoscience & Nanotechnology
Chunguang Zhu, Qian Gao, Chunxiao Wang, Linrui Shi, Sen Yin, Peiling Chen, Ting Guo, Zhenpeng Hu, Lei Ying
Summary: In this study, a novel multifunctional thiazole-fused quinoxalineimide semiconducting polymer (PQIA-BDTT) was developed, which exhibits NIR-II fluorescence and photothermal properties for photothermal therapy and tumor fluorescence imaging. The nanoparticles of PQIA-BDTT achieved high photothermal conversion efficiency and can be used for NIR-II fluorescence imaging at low laser fluence.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Jing Peng, Yueqi Su, Haifeng Lv, Jiajing Wu, Yuhua Liu, Minghao Wang, Jiyin Zhao, Yuqiao Guo, Xiaojun Wu, Changzheng Wu, Yi Xie
Summary: In this study, a new 2D ferromagnetic material, CuCrSe2 nanosheets with even-odd-layer-dependent ferromagnetism when laminated from an antiferromagnetic bulk, is reported. Monolayer and even-layer CuCrSe2 exhibit the anomalous Hall effect and a significantly enhanced magnetic ordering temperature, while the odd-layer samples exhibit the linear Hall effect. Theoretical calculations suggest that the layer-dependent magnetic coupling is attributable to the orbital shift of the Cr atoms in the CrSe2 layers due to the Cu-induced breaking of the centrosymmetry.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Qiyang Jiao, Xingwu Zhai, Zhixin Sun, Wenjie Wang, Shihao Liu, Hui Ding, Wangsheng Chu, Min Zhou, Changzheng Wu
Summary: This study develops an ultrafast, universal, and cost-effective superfilling method to construct a metal artificial interface decorated Zn anode in situ. Most zincophilic metals can be used to construct a homogenous interface without any restrictions on the size, morphology, or curvature of the substrates. The obtained Sn@Zn anode exhibits superior electrochemical performance and can operate for over 900 hours at different current densities. The easy fabrication and recyclability of the cells enable efficient design and exploration of Zn anodes for research, industrialization, and commercialization purposes.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Physical
Caiyan Zheng, Huili Wang, Dan Wu, Jian Xu, Zhenpeng Hu
Summary: Proper modeling is crucial for calculating surface properties of complex oxides, such as perovskite oxides. A passivation method was proposed to handle complex polar surfaces, using pseudo-atoms with fractional charges to balance non-zero net charges. The study on LaCoO3 surfaces with different terminations showed that (1 (1) over bar 02)-LaO, (1 (1) over bar 02)-CoO2, and (0001)-LaO3 terminations were stable surfaces in different chemical environments. The passivated terminations also showed consistent oxygen vacancy formation energies and electronic structure changes with experimental results.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Materials Science, Multidisciplinary
Qian Gao, Lifeng Ou, Zhenpeng Hu
Summary: A new carbon family is proposed through bottom-up design using polyhedral units as building blocks. 31 carbon allotropes are proposed and more than 20 structures have not been reported before. These structures have important applications in semiconductor devices, energy storage, batteries, catalysis, etc.
Article
Chemistry, Multidisciplinary
Tianpei Zhou, Yetao Xu, Yu Zhen, Kaijin Wu, Honghe Ding, Linjun Wang, Xiaolin Tai, Xueru Cai, Xun Zhang, Tianpu Xia, Junfa Zhu, Wangsheng Chu, Yong Ni, Yi Xie, Changzheng Wu
Summary: A layered inorganic silicate aerogel pillared with nanoclusters has been developed for high temperature thermal insulation. The well dispersed and strong coupled nanocluster pillars in the interlayers not only significantly decrease the solid thermal conductivity but also maintain the layered structure under high temperatures.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Yang Wang, Minghao Wang, Ting Chen, Weisheng Yu, Hongfei Liu, Han Cheng, Wentuan Bi, Min Zhou, Yi Xie, Changzheng Wu
Summary: In this study, a novel Fe-N(4) conjugated organic polymer (COP) electrocatalyst was developed, allowing for precise design of the Fe-N(4) structure and exhibiting better ORR performance. The COP showed a half-wave potential of 0.933 V and negligible activity decay after 40,000 cycles. When used as the cathode electrocatalyst in a hydroxide exchange membrane fuel cell, it achieved a peak power density of around 210 mW/cm².
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Review
Chemistry, Multidisciplinary
Zejun Li, Zhi Zhang, Xiaoli Zhou
Summary: This comprehensive review summarizes the recent achievements in chemical synthesis of VO2 and its MIT modulation, as well as discusses the newly appearing phenomena, mechanism of electronic correlation, and progresses related to MIT-driven applications.
Article
Materials Science, Multidisciplinary
Yuhua Liu, Jing Peng, Kai Zhang, Mei Sun, Ming Huang, Wenjie Wang, Yueqi Su, Xiaojun Wu, Yi Xie, Changzheng Wu
Summary: Layered materials with intercalated ions have diverse physical and chemical properties. To create exotic two-dimensional materials, doping and alteration of crystals by ionic guest species are commonly used. In this study, a new interlayered structure in Cu0.65NbS2 nanosheets was found to induce superconductivity, which is different from the normal-metal crystal.
SCIENCE CHINA-MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Wei Feng, Ping Yang, Bingkai Yuan, Zhenpeng Hu, Xiegang Zhu, Qunqing Hao, Yun Zhang, Qiang Zhang, Bo Wang, Shiyong Tan, Xinchun Lai, Qin Liu, Qiuyun Chen
Summary: By using scanning tunneling microscopy/spectroscopy (STM/STS), we observed the Kondo effect driven by 5 f electrons and subatomic features of single U atoms on graphene/6H-SiC(0001), Cu2N/Cu(100), and Bi(110). The asymmetric-dip spectral feature around the Fermi energy, as an indication of Kondo resonance in STM/STS, was observed in all three systems. The size of the screening cloud for single U atoms on Bi(110) was larger than that on the other two substrates, suggesting more itinerant behavior of the 5 f electrons on Bi(110). Additionally, distinct subatomic features were observed from the dI/dV maps of U atoms on different substrates, which were attributed to the orbital selective hybridizations between U atoms and the substrates.
Article
Chemistry, Multidisciplinary
Qingpeng Cheng, Xueli Yao, Lifeng Ou, Zhenpeng Hu, Lirong Zheng, Guanxing Li, Natalia Morlanes, Jose Luis Cerrillo, Pedro Castano, Xingang Li, Jorge Gascon, Yu Han
Summary: Researchers achieved high incorporation of nickel (Ni) catalysts into the framework of ZSM-5 zeolite using a ligand-protected synthesis method. The incorporated Ni species formed metal-oxygen pairs, promoting the dissociation of C-H bonds in methane. The catalyst exhibited higher activity and stability, inhibiting coke formation through the CHx oxidation pathway.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2023)
Article
Chemistry, Inorganic & Nuclear
Lifu Zhang, Lanlan Chen, Wanghui Zhao, Zhenpeng Hu, Jing Chen, Wenhua Zhang, Jinlong Yang
Summary: Selectivity toward ammonia is an important indicator for electrocatalysts in the electrochemical nitrogen reduction reaction (eNRR). This study focuses on improving selectivity through multiple adsorptions and unoccupied d-orbitals of the supported metal atom. The machine learning model successfully predicts the low limiting potential and high selectivity of the catalysts, which was further confirmed by experiments.
INORGANIC CHEMISTRY FRONTIERS
(2023)