Article
Chemistry, Multidisciplinary
Ki-Hyun Cho, Prashant K. Jain
Summary: Nanostructuring is a powerful tool for tuning electronic properties and enhancing transport. By utilizing one-dimensional nanostructures, we have demonstrated superionic conduction with record-high ionic conductivity in solid electrolytes fabricated from nanowires of copper selenide.
Article
Multidisciplinary Sciences
Shuo Lou, Bosai Lyu, Jiajun Chen, Lu Qiu, Saiqun Ma, Peiyue Shen, Zhichun Zhang, Yufeng Xie, Qi Liang, Kenji Watanabe, Takashi Taniguchi, Feng Ding, Zhiwen Shi
Summary: Graphene nanoribbons (GNRs) and carbon nanotubes (CNTs) are one-dimensional graphitic materials with promising applications in nanoelectronics. A generic method for the synthesis of both GNRs and CNTs, as well as their heterojunctions, has been developed using catalyzed chemical vapor deposition (CVD) on atomically flat hexagonal boron nitride (h-BN) substrates. The relative ratio of GNRs and CNTs can be controlled by adjusting the growth temperature or feeding gas pressures. Additionally, GNR/CNT intramolecular junctions were achieved by changing the H-2 partial pressure during the growth process.
SCIENTIFIC REPORTS
(2023)
Article
Chemistry, Physical
Tiago de Sousa Araujo Cassiano, Pedro Henrique de Oliveira Neto, Geraldo Magela Silva
Summary: This paper proposes a simplified model to simulate charge transport in cove-type heterojunctions by considering nanoribbons as one-dimensional polymers. The results indicate that the electron-phonon constant and sites' masses can vary depending on the nanoribbon structure. This approach provides a clearer picture to investigate the effects of junction formation on charge transport.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Multidisciplinary
Chenmu Zhang, Ruoyu Wang, Himani Mishra, Yuanyue Liu
Summary: Researchers have discovered new 2D semiconductors with significantly higher carrier mobility than current ones, even surpassing bulk silicon, through computational screening and accurate calculation using a novel first-principles method. The exceptional mobilities can be explained by several physical features, including a new feature called carrier-lattice distance, which correlates well with mobility and is easy to calculate.
PHYSICAL REVIEW LETTERS
(2023)
Article
Physics, Multidisciplinary
Xueying Wang, Hong-Yan Shih, Nigel Goldenfeld
Summary: In this study, a spatially extended stochastic minimal model is proposed to describe the energy budget in transitional flows, taking into account the influence of flow geometry. The model successfully replicates the decay, splitting, and growth processes of localized turbulent patches in transitional flows as the Reynolds number increases. The model is also extended to quasi-one-dimensional Taylor-Couette flow, reproducing the directed percolation pattern observed in space and time.
PHYSICAL REVIEW LETTERS
(2022)
Article
Materials Science, Multidisciplinary
Polina Matveeva, Tyler Hewitt, Donghao Liu, Kethan Reddy, Dmitri Gutman, Sam T. Carr
Summary: The authors construct microscopic models of one-dimensional noninteracting topological insulators in all chiral universality classes. They find that the Z topological index in individual chains is defined only up to a sign, and the freedom to choose the sign of the chiral symmetry operator on each chain independently allows for two distinct possible chiral symmetry operators. The authors also study the properties of edge states in the constructed models, discuss the role of particle-hole symmetry in protecting edge states, and generalize the results to the case of an arbitrary number of coupled chains.
Article
Chemistry, Physical
Mirko Poljak, Mislav Matic
Summary: The study reveals that metallization decreases transmission and conductance, and can either enlarge or diminish the transport gap depending on GNR dimensions. Additionally, 1D edge contacts and size engineering can be utilized to tune the R-C in GNRs to values lower than graphene.
Article
Chemistry, Multidisciplinary
Hao-Fei Ni, Lou-Kai Ye, Peng-Cheng Zhuge, Bo-Lan Hu, Jia-Rui Lou, Chang-Yuan Su, Zhi-Xu Zhang, Li-Yan Xie, Da-Wei Fu, Yi Zhang
Summary: This study reports a new nickel-based organic-inorganic halide perovskite ferroelectric with high spontaneous polarization and Curie temperature. The unique structure contributes to the diversity of organic-inorganic halide perovskite structures and will further promote research on nickel-based organic-inorganic halide perovskite ferroelectrics.
Article
Materials Science, Multidisciplinary
Suraj S. Hegde, Inti Sodemann Villadiego
Summary: We investigate spin- and valley-symmetry-broken fractional quantum Hall phases and predict a sequence of transitions from a sublattice polarized state to a valley coherent Kekule charge density wave state and further to an antiferromagnetic phase. For filling fractions such as nu = +/- 1/3, we predict a transition from a Laughlin-type state to a two-component Halperin-type state both with a charge density wave order. Moreover, for nu = +/- 1/3,+/- 2/3, we predict a canted Kekule density phase where the spinors of integer and fractionally occupied components have different orientations in the valley Bloch sphere.
Article
Multidisciplinary Sciences
Junwei Li, Yanhao Lin, Thomas Meier, Zhipan Liu, Wei Yang, Ho-kwang Mao, Shengcai Zhu, Qingyang Hu
Summary: This study investigates the incorporation of water in stishovite using a high-dimensional neuronetwork potential and machine learning algorithm. The researchers found that stishovite and water prefer to form medium- to long-range ordered superstructures with one-dimensional water channels. By synthesizing hydrous stishovite crystals, they confirmed the ordering of OH- groups in the water channels through spectroscopy and observed fluid-like behavior of H atoms upon heating, leading to an exotic 1D superionic state.
Article
Chemistry, Multidisciplinary
Fang-Fang Di, Hang Peng, Hua Zhang, Xue-Qin Huang, Wu-Jia Chen, Yu-Ling Liu, Yuan-Yuan Tang
Summary: Monofluorine substitution serves as a simple and universal method to enhance the performance of high-Tc phase transition materials. The experimental results on (FTEA)PbBr3 validate the effects of fluoridation on boosting Tc, dielectric properties, and luminescent properties.
MATERIALS CHEMISTRY FRONTIERS
(2021)
Article
Optics
Zhihao Xu, Shu Chen
Summary: This study investigates the dynamical evolution of a PT symmetric extension of the Aubry-Andre model, which shows the coincidence of a localization-delocalization transition point with a PT symmetry breaking point. The behavior of wave packet spreading differs between the PT symmetry unbroken regime and the PT symmetry broken regime. Distinctive features of the Loschmidt echo with the postquench parameter being localized in different PT symmetric regimes are discussed.
Article
Materials Science, Multidisciplinary
A. Rodriguez, K. Papatryfonos, E. R. Cardozo de Oliveira, N. D. Lanzillotti-Kimura
Summary: This study proposes a design strategy to generate and manipulate topological nanophononic interface states within high-order bandgaps of GaAs/AlAs multilayered structures. By adjusting the thickness ratio of the unit cells in these superlattices, interface states can be engineered in different bandgaps, enabling the development of versatile topological devices spanning a wide frequency range.
Article
Physics, Fluids & Plasmas
Ziba Saleki, A. J. Majarshin, Yan-An Luo, De-Long Zhang
Summary: The study investigates the optical properties and spectral statistics of light in one-dimensional photonic crystals in different classes using the transfer matrix method and random matrix theory. Results show that the characteristics of chaotic and regular optical systems can be determined using random matrix theory, and regularity patterns have been found in both (AB)N and (AGBG)N classes.
Article
Chemistry, Inorganic & Nuclear
Kejian Qu, Zachary W. Riedel, Irian Sanchez-Ramirez, Simon Bettler, Junseok Oh, Emily N. Waite, Toby J. Woods, Nadya Mason, Peter Abbamonte, Fernando de Juan, Maia G. Vergniory, Daniel P. Shoemaker
Summary: The structure of quasi-one-dimensional material (Nb4Se15I2)I2, consisting of needle shaped single crystals, was determined by single-crystal X-ray diffraction. The structure features 1D (Nb4Se15I2)n chains along the [101] direction, with two directly bonded I- ions per formula unit to Nb5+, and two loosely coordinated I- ions intercalated between the chains. The compound is chiral, with stacks of chains in opposing directions along the b axis, belonging to space group P21/c. It is a well-characterized semiconductor with a direct band gap of around 0.6 eV, confirmed by density functional theory calculations. Resistivity measurements show an activation energy of around 0.1 eV, and no structural phase transformation was observed from room temperature to 8.2 K, unlike related compounds (NbSe4)nI (n = 2, 3, or 3.33).
INORGANIC CHEMISTRY
(2023)
Article
Materials Science, Multidisciplinary
Ping Kwong Cheng, Safayet Ahmed, Junpeng Qiao, Lok Wing Wong, Chun Fai Yuen, Ahmed Mortuza Saleque, Md Nahian Al Subri Ivan, Sumaiya Umme Hani, Mohammad Ismail Hossain, Jiong Zhao, Qiao Wen, Yuen Hong Tsang
Summary: Two-dimensional transition metal dichalcogenide (TMD) PdTe2 exhibits excellent nonlinear optical properties and can be widely used in applications such as superconductors, phototransistors, and millimeter-wave receivers. Broadband PdTe2-based saturable absorbers (SA) prepared by aerosol jet printing (AJP) enable the generation of broadband ultrafast laser pulses in the near-to-mid-infrared regime, demonstrating the potential of PdTe2 as an ideal material for ultrafast photonics devices.
APPLIED MATERIALS TODAY
(2022)
Article
Chemistry, Multidisciplinary
Haijun Liu, Quoc Huy Thi, Ping Man, Xin Chen, Tianren Chen, Lok Wing Wong, Shan Jiang, Lingli Huang, Tiefeng Yang, Ka Ho Leung, Tsz Tung Leung, Shan Gao, Honglin Chen, Chun-Sing Lee, Min Kan, Jiong Zhao, Qingming Deng, Thuc Hue Ly
Summary: This study introduces novel ice-aided transfer and ice-stamp transfer methods, which achieve ultrahigh quality and exceptional cleanliness in transferring 2D materials. In addition, ice can also be used for cleaning the surfaces of 2D materials. These new techniques enable unprecedented ultraclean 2D materials surfaces and performances, contributing to upcoming technological revolutions associated with 2D materials.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Dengrong Sun, Lok Wing Wong, Hok Yin Wong, Ka Hei Lai, Lin Ye, Xinyao Xv, Thuc Hue Ly, Qingming Deng, Jiong Zhao
Summary: The atomic structure of multivariate metal-organic frameworks (MTV-MOFs) was visualized using the iDPC-STEM technique, guiding the design of bulk MOFs for efficient oxygen evolution reaction (OER). Incorporating Fe3+ or 2-aminoterephthalate (ATA) into Ni-BDC weakened the coordination bonds, allowing for selective cleavage via mild heat treatment to generate coordinatively unsaturated metal sites, conductive Ni@C, and hierarchical porous structure. The defective MOFs exhibited excellent OER activity, with current densities of 10 and 100 mA cm(-2) achieved at small overpotentials of 286 mV and 365 mV, respectively, surpassing commercial RuO2 catalyst and most bulk MOFs.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Nanoscience & Nanotechnology
Hok Yin Wong, Lok Wing Wong, Chi Sing Tsang, Zhangyuan Yan, Xuming Zhang, Jiong Zhao, Thuc Hue Ly
Summary: Atmospheric water harvesting (AWH) is a possible solution for the water crisis and the key process has been applied in commercial dehumidifiers. A superhydrophobic surface technique, induced by coalescence-induced jumping, is proposed to enhance the AWH process. In this study, a simple and low-cost approach for superhydrophobic surface engineering through alkaline oxidation of copper is reported, which provides medium-sized microflower structures that act as nucleation sites and promoters for the AWH process. Machine learning computer vision techniques are also applied to optimize the AWH structure for droplet dynamic analysis on a micrometer scale. Overall, the alkaline surface oxidation and medium-scale microstructures offer great opportunities for superhydrophobic surfaces in AWH applications.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Physics, Applied
Yuqian Zhao, Feng Guo, Sin-Yi Pang, Weng Fu Io, Lok-Wing Wong, Jiong Zhao, Jianhua Hao
Summary: The anisotropic Raman response of ultrathin black phosphorus (BP) transferred to an oxide dielectric substrate is investigated by utilizing a piezoelectric actuator to perform biaxial strain engineering. The strained Raman response is related to the variations of bond angle and bond length in BP, and biaxial strain modulation can change the anisotropic dispersion of BP.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Physical
Xiaoqin Feng, Jingchun Su, Chenglei Yan, Guibin Chen, Qingming Deng
Summary: Based on density functional theory (DFT) calculations, we found that Sc-SP single atom catalyst exhibits the highest catalytic activity for CO oxidation, and its catalytic behavior is independent of different macrocyclic ligands. This provides a new strategy for designing efficient single atom catalysts.
APPLIED SURFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Quoc Huy Thi, Ping Man, Haijun Liu, Lingli Huang, Xin Chen, Chun-Sing Lee, Jiong Zhao, Qingming Deng, Saba Saeed, Thuc Hue Ly
Summary: Low temperature and high humidity conditions degrade the performance of solid-state lubricants by enhancing interlayer friction due to the presence of liquid water layer attached to the van der Waals (vdW) atomic layers. However, this study reveals unexpected ultralow friction between 2D ice and 2D molybdenum disulfides (MoS2) using low temperature in situ atomic force microscopy (AFM) and friction force microscopy (FFM). The friction of MoS2 and 2D ice is reduced by more than 30% compared to bare MoS2 and rigid surface.
Review
Chemistry, Multidisciplinary
Ping Man, Lingli Huang, Jiong Zhao, Thuc Hue Ly
Summary: Two-dimensional (2D) ferroics, including ferroelectric, ferromagnetic, and ferroelastic materials, have gained significant attention due to their unique physical properties and potential applications. Recent theoretical predictions have identified various 2D ferroic phases, including multiferroics and newly discovered ferrovalleytronics/ferrotoroidics, even at the atomic scale. These predictions have been experimentally confirmed, and the manipulation of ferroic phases in 2D materials through stacking, doping, and defects has also been demonstrated. The remarkable ferroic ordering in 2D materials holds great promise for high-density memory devices, energy conversion devices, and sensing applications. This comprehensive review explores the recent advances in 2D ferroic phases, focusing on the chemistry and structural origins of these properties, as well as discussing their potential applications in information storage, optoelectronics, and sensing. Furthermore, future pathways for research and development in 2D ferroics are envisioned, aiming to provide a comprehensive understanding of this field and facilitate further exploration of new materials and physical phenomena that will have a significant impact on future functional materials and devices.
Article
Chemistry, Multidisciplinary
Xu Wen Zhao, Hon Fai Wong, Yu Kuai Liu, Sheung Mei Ng, Min Gan, Lok Wing Wong, Jiong Zhao, Zongrong Wang, Wang Fai Cheng, Chuanwei Huang, Linfeng Fei, Chee Leung Mak, Chi Wah Leung
Summary: This study demonstrates the regulation of negative exchange bias in ferromagnetic/antiferromagnetic manganite bilayers using the field-effect device geometry with a ferroelectric copolymer as a gating layer. The low-voltage pulse modulation of exchange bias is achieved by creating/annihilating oxygen vacancies in the antiferromagnetic layer. This research highlights the potential for low-voltage pulse control of physical properties in antiferromagnetic perovskite oxide insulators.
ADVANCED MATERIALS INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Yanyu Lin, Zhangyuan Yan, Chi Shing Tsang, Lok Wing Wong, Xiaodong Zheng, Fangyuan Zheng, Jiong Zhao, Ke Chen
Summary: Recent advancements in TEM have enabled the study of atomic structures at unprecedented small scales. However, accurately detecting atomic positions from TEM images remains challenging, especially in the presence of background noise or contamination. To overcome this, AtomID-Net, a deep neural network model, is introduced for atomic detection from low-SNR experimental images in STEM. The model, trained on real images, achieves robust and efficient detection even in the presence of noise and contamination, outperforming existing peak-finding algorithms.
Article
Multidisciplinary Sciences
Weng Fu Io, Sin -Yi Pang, Lok Wing Wong, Yuqian Zhao, Ran Ding, Jianfeng Mao, Yifei Zhao, Feng Guo, Shuoguo Yuan, Jiong Zhao, Jiabao Yi, Jianhua Hao
Summary: Robust out-of-plane ferroelectricity is observed in 2D vdW CuCrP2S6, providing important insights into its nature and potential for advanced device applications.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Physical
Haiyan Jin, Lok Wing Wong, Ka Hei Lai, Xiaodong Zheng, Shu Ping Lau, Qingming Deng, Jiong Zhao
Summary: A simple fabrication method for vacancy-rich IrCo alloy catalysts has been developed by post-annealing single atom dispersed precursors. The resulting catalyst exhibits enhanced activity and stability compared to traditional methods.