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Articles by Enge Wang
Single-crystal rhombohedral boron nitride wafers for integrated sliding ferroelectric memory
Abstract Two-dimensional rhombohedral boron nitride (rBN) has emerged as a promising sliding ferroelectric material for high-density, fast-speed and non-volatile memories. However, the batch production of ferroelectric rBN wafers has remained a critical challenge due to the thermodynamic instability of the rhombohedral phase and the inherent difficulties in maintaining consistent growth kinetics.
Step geometry–guided growth of rhombohedral graphene
Editor’s summary Abstract Supplementary Materials References and Notes Information & Authors Metrics & Citations Check Access References Figures Tables Media Share Editor’s summary Phase-pure rhombohedral graphene, which has an ABC layer stacking, has been grown through step geometry–guided epitaxy. Zhao et al. used a copper-nickel–coated sapphire surface with a stepped geometry chosen so that interlayer slip and orientation angles of the graphene layers favored rhombohedral stacking.
Highly sensitive microphones based on large freestanding reduced graphene oxide membranes
Abstract Highly sensitive acoustic sensing devices are essential for human‒machine interfaces and modern advanced artificial intelligence (AI) technology. Two-dimensional (2D) materials exhibiting atomically thin thickness and superior mechanical properties are, in principle, ideal membranes for ultimate acoustic sensing. In this work, we present an ultrasensitive microphone using large freestanding reduced graphene oxide (rGO) membranes.
Attosecond three-stage formation and coherent exciton dynamics in a two-dimensional material under strong field
Abstract Excitons play a crucial role in optical properties of two-dimensional materials. While significant progress has been made in understanding exciton dynamics on femtosecond timescales, the microscopic details of the earliest stages of exciton formation and evolution remain elusive.
Nonlinear phase-matched van der Waals crystals integrated on optical fibres - Nature Materials
Abstract High optical nonlinearity can enable classical and quantum functionalities in all-fibre laser systems. However, despite long-standing efforts to exploit second-order optical nonlinearity in conventional all-fibre systems, nonlinear optical conversion efficiencies remain modest.
Molecularly resolved mapping of heterogeneous ice nucleation and crystallization pathways using in-situ cryo-TEM - Nature Communications
Abstract Crystallization plays a fundamental role in diverse fields such as glaciology, geology, biology, and materials science. Among various crystallizing systems, the formation of ice remains elusive, despite decades of intensive investigation.
Anomalous photovoltaics in Janus MoSSe monolayers - Nature Communications
Abstract The anomalous photovoltaic effect (APE) in polar crystals is a promising avenue for overcoming the energy conversion efficiency limits of conventional photoelectric devices utilizing p-n junction architectures. To facilitate effective photocarrier separation and enhance the APE, polar materials need to be thinned down to maximize the depolarization field. Here, we demonstrate Janus MoSSe monolayers (~0.67 nm thick) with strong spontaneous photocurrent generation.
Post-docking hydrophilic Ag-MOF-303 filled in TFC for nanofiltration of charged PhACs in water
Pharmaceutically active compounds (PhACs) represent a class of persistent pollutants that are challenging to degrade[1]. Current methods for PhACs removal, including advanced oxidation and adsorption, still face the challenge of generating secondary pollutants[2]. Nanofiltration, with its low molecular weight cutoff (100–1000 Da), is particularly well-suited for separating PhACs of similarly low molecular weights[3]. For example, Liang et al.
Mechanical exfoliation of non-layered metal oxides into ultrathin flakes - Nature Synthesis
Abstract The exfoliation of layered crystals can produce diverse two-dimensional (2D) materials and heterostructures. However, the micromechanical cleavage of non-stratified materials into 2D flakes remains challenging due to z-direction consecutive bonding. Here we report a mechanical exfoliation method for producing freestanding 2D metal oxide flakes.
Effect of ion-specific water structures at metal surfaces on hydrogen production - Nature Communications
Abstract Water structures at electrolyte/electrode interfaces play a crucial role in determining the selectivity and kinetics of electrochemical reactions. Despite extensive experimental and theoretical efforts, atomic-level details of ion-specific water structures on metal surfaces remain unclear.
Understanding epitaxial growth of two-dimensional materials and their homostructures - Nature Nanotechnology
Abstract The exceptional physical properties of two-dimensional (2D) van der Waals (vdW) materials have been extensively researched, driving advances in material synthesis. Epitaxial growth, a prominent synthesis strategy, enables the production of large-area, high-quality 2D films compatible with advanced integrated circuits. Typical 2D single crystals, such as graphene, transition metal dichalcogenides and hexagonal boron nitride, have been epitaxially grown at a wafer scale.
Interfacial epitaxy of multilayer rhombohedral transition-metal dichalcogenide single crystals
Editor’s summary Single crystals of rhombohedral transition metal dichalcogenides (3R-TMDs) have been produced through interfacial epitaxy. These crystals exhibit higher current density and carrier mobility than monolayer and hexagonal (2H) TMDs. Qin et al. continuously delivered metals and chalcogens to the interface between a single-crystal nickel substrate to grow a consistent 3R stacking sequence.
Strong chiroptical nonlinearity in coherently stacked boron nitride nanotubes - Nature Nanotechnology
Abstract Nanomaterials with a large chiroptical response and high structural stability are desirable for advanced miniaturized optical and optoelectronic applications. One-dimensional (1D) nanotubes are robust crystals with inherent and continuously tunable chiral geometries. However, their chiroptical response is typically weak and hard to control, due to the diverse structures of the coaxial tubes.
Bevel-edge epitaxy of ferroelectric rhombohedral boron nitride single crystal - Nature
Abstract Within the family of two-dimensional dielectrics, rhombohedral boron nitride (rBN) is considerably promising owing to having not only the superior properties of hexagonal boron nitride1,2,3,4—including low permittivity and dissipation, strong electrical insulation, good chemical stability, high thermal conductivity and atomic flatness without dangling bonds—but also useful optical nonlinearity and interfacial ferroelectricity originating from the broken in-plane and out-of-plane...
Tracking cubic ice at molecular resolution - Nature
Abstract Ice is present everywhere on Earth and has an essential role in several areas, such as cloud physics, climate change and cryopreservation. The role of ice is determined by its formation behaviour and associated structure. However, these are not fully understood1. In particular, there is a long-standing debate about whether water can freeze to form cubic ice—a currently undescribed phase in the phase space of ordinary hexagonal ice2,3,4,5,6.
Disorder-tuned conductivity in amorphous monolayer carbon - Nature
Author notes These authors contributed equally: Huifeng Tian, Yinhang Ma, Zhenjiang Li, Mouyang Cheng, Shoucong Ning Authors and Affiliations School of Materials Science and Engineering, Peking University, Beijing, China Huifeng Tian, Zhenjiang Li, Ruijie Li, PeiChi Liao, Shulei Yu, Shizhuo Liu, Yifei Li, Xinyu Huang, Zhixin Yao, Li Lin, Xiaoxu Zhao, Ting Lei, Yanfeng Zhang, Yanglong Hou & Lei Liu School of Physical Sciences, CAS Key Laboratory of Vacuum Physics, University of Chinese Academy...
Continuous epitaxy of single-crystal graphite films by isothermal carbon diffusion through nickel - Nature Nanotechnology
Author notes These authors contributed equally: Zhibin Zhang, Mingchao Ding, Ting Cheng.
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