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CVD growth of 2D materials
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Publications (85)
Epitaxial growth of 2D transition metal dichalcogenides (TMDCs) on sapphire substrates has been recognized as a pivotal method for producing wafer‐scale single‐crystal films. Both step‐edges and symmetry of substrate surfaces have been proposed as controlling factors. However, the underlying fundamental still remains elusive. In this work, through...
Ultrathin PtSe2 ribbons can host spin‐polarized edge states and distinct edge electrocatalytic activity, emerging as a promising candidate for versatile applications in various fields. However, the direct synthesis is still challenging and the growth mechanism is still unclear. Herein, the arrayed growth of ultrathin PtSe2 ribbons on bunched vicina...
2D semiconducting transition metal dichalcogenides (TMDs) are emerging as promising candidates in the pursuit of advancing semiconductor technology. One major challenge for integrating 2D TMD materials into practical applications is developing an epitaxial technique with robust reproducibility for single‐oriented growth and thus single‐crystal grow...
Functional magnetic loofah (FMC) was prepared by a chemical graft of magnetic nanoparticles MnFe2O4 onto the loofah (ML) after being pretreated and carbonized by NaOH, and its adsorption properties as adsorbent for uranium-containing wastewater were studied. The results show that the equilibrium adsorption capacity of FMC for uranyl ions is 270.95...
2D semiconducting transition‐metal dichalcogenides (TMDs) have attracted considerable attention as channel materials for next‐generation transistors. To meet the industry needs, large‐scale production of single‐crystal monolayer TMDs in highly reproducible and energy‐efficient manner is critically significant. Herein, it is reported that the high‐r...
A new composite material, diethylenetriamine-functionalized thiosulfate intercalated zinc-nickel-aluminum hydrotalcite (DETA-ZnNiAl-S2O3²⁻-LDHs), was synthesized by introducing S2O3²⁻ between ZnNiAl-LDHs layers and grafting diethylenetriamine for functionalization modification. The morphological structure and physicochemical properties of samples w...
Epitaxial growth of wafer-scale monolayer semiconducting transition metal dichalcogenide single crystals is essential for advancing their applications in next-generation transistors and highly integrated circuits. Several efforts have been made for the growth of monolayer MoS2 single crystals on high-symmetry Au(111) and sapphire substrates, while...
The efficient adsorption of radioactive elements from nuclear wastewater is an important research topic in the environmental field. The unique three-dimensional porous structure of aerogels has great potential in the field of adsorption. Phosphoric-modified aloe vera/chitosan aerogel (CS/AL-AP) was prepared from chitosan, phosphoric acid, and aloe...
The reflectivities of monolayer two-dimensional crystals, immersed in polydimethylsiloxane, have been measured at a wavelength of 532 nm. The polydimethylsiloxane does not alter the physical properties of the atomic crystals. The only difference with respect to the study of a free-standing sample is that the two-dimensional crystals are embedded in...
A new type of zeolite X with high purity and crystallinity was prepared from waste basalt powder by alkaline hydrothermal fusion and its adsorption performance as an adsorbent on uranium-containing wastewater was investigated. The results show that the equilibrium adsorption capacity of zeolite X for uranyl ions is 228.4 mg g−1. The adsorption proc...
Self-intercalation of native metal atoms in two-dimensional (2D) transition metal dichalcogenides has received rapidly increasing interest, due to the generation of intriguing structures and exotic physical properties, however, only reported in limited materials systems. An emerging type-II Dirac semimetal, NiTe2, has inspired great attention at th...
Two-dimensional (2D) semiconductors, especially transition metal dichalcogenides (TMDs), have been envisioned as promising candidates in extending Moore’s law. To achieve this, the controllable growth of wafer-scale TMDs single crystals or periodic single-crystal patterns are fundamental issues. Herein, we present a universal route for synthesizing...
Three‐dimensional (3D) architecratured transition metal dichalcogenides (TMDCs) constructed by atomically thin layers are appealing building blocks in various applications, such as catalysts, energy storage and conversions, sensors, etc. However, direct growth of 3D TMDCs architectures with high crystal quality and well‐controlled size/thickness re...
Moiré superlattices formed by the stacking of two-dimensional (2D) transition metal dichalcogenide lattices on substrate lattices have been reported to imply a crucial effect on the electronic properties of 2D materials (e.g., band gap, doping level) and their physical properties. Herein, we report the direct observation of various striped moiré su...
Two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDCs), most with a formula of MX2 (M = Mo, W; X = S, Se, etc.), have emerged as ultrathin channel materials in next-generation electronics, due to their atomic thickness, tunable bandgap, and relatively high carrier mobility, etc. To propel their practical applications in integr...
Ternary zinc-nickel-aluminum hydrotalcites (ZnNiAl-LDHs) were prepared by hydrothermal synthesis. The structure and morphology of the materials were characterized using X-ray diffraction (XRD), fourier transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), nitrogen adsorption–desorption (BET) and other test techniques. ZnNiAl-...
The out-of-plane optical constants of monolayer two-dimensional materials have proven to be experimentally elusive. Owing to their reduced dimensionality, optical measurements have limited sensitivity to these properties which are hidden by the optical response of the substrate. Therefore, there remains an absence of scientific consensus on how to...
Using the waste basalt powder, ferric chloride (FeCl3·6H2O), ferrous sulfate (FeSO4·7H2O), 3-aminotrimethoxysilane (3-TMSPT) and Chitosan (CTS) as raw materials, through hydrothermal synthesis, in-situ synthesis, cross-linking and grafting methods, the amino-modified chitosan/magnetic zeolite composite (NH2-CTS/MZ) was prepared. The samples were ch...
Utilising the general waste such as non-burning brick as raw materials to prepare low-cost zeolite is in line with the green chemical industry and can achieve the purpose of treating waste with waste. Here we use the abandoned non-burning brick powder as raw material, the sulfhydryl functionalized magnetic zeolite composites (MZ-SH) were prepared b...
Among two-dimensional (2D) layered materials, metallic transition metal dichalcogenides (MTMDCs) are emerging as promising candidates in many application aspects (e.g., electronics, spintronics, and energy related fields, etc.) in view of their ultrahigh electronic conductivities, newfangled room-temperature ferromagnetism (e.g., VSe2, VTe2), and e...
Recently, two-dimensional (2D) transition metal dichalcogenides (TMDCs) have emerged as promising materials for energy-related applications, owing to their fascinating properties such as abundant catalytic active sites, large specific surface area, and low cost. To promote these applications, the scalable preparation of 2D TMDCs is an essential iss...
Environmentally adaptive power generation is attractive for the development of next-generation energy sources. Here we develop a heterogeneous moisture-enabled electric generator (HMEG) based on a bilayer of polyelectrolyte films. Through the spontaneous adsorption of water molecules in air and induced diffusion of oppositely charged ions, one sing...
In order to make full use of waste as raw materials to prepare low-cost zeolite, develop green chemical industry and achieve the purpose of treating waste with waste. High-purity zeolite X was prepared by the alkaline fusion hydrothermal method (AFH) using waste basalt powder as raw material, and was used as an adsorbent to investigate the adsorpti...
Soda‐lime glass presents a smooth “liquid‐phase” surface at high temperature (≈900 °C), which is helpful for the fast growth of large‐size monolaye MoSe2 single crystals. The unique “beam‐bridge” assisted metal‐precursor feeding strategy contributes to sufficient, homogeneous release of Mo‐based precursor, thereby leading to the ultrafast growth (≈...
2D semiconducting transition metal dichalcogenides (TMDCs) have emerged as essential building blocks for engineering next‐generation integrated electronics. To achieve this, the controllable synthesis of monolayer TMDCs with high crystal quality, low cost, and high yield is crucial, while it remains challenging. Herein, the direct synthesis of larg...
Molybdenum disulfide (MoS2) films have been widely used in many optical devices owing to their excellent optical properties. In this paper, inch-scale MoS2 films were grown on sapphire substrates through chemical vapor deposition (CVD) and transferred to SiO2/Si substrates. Analysis of Raman spectroscopy shows the transfer process releases uniaxial...
Starch not only has the advantage of inexpensive and biodegradable compared to other adsorbed materials but also contains a large amount of chemically modified hydroxyl groups. Using starch as the raw material, an amino-functionalized starch-based adsorbent was prepared by a three-step reaction of esterification-crosslinking- aminolysis. The sample...
In this Letter, we report an optically stimulated synaptic transistor based on ${{\rm MoS}_2}/{\rm quantum}$ M o S 2 / q u a n t u m dots mixed-dimensional (MD) heterostructure, where the channel conductance shows a non-linear response to the optical stimuli. Paired-pulse facilitation is realized with the index above 200%, and the optical synaptic...
Plasticity modulation, which enables the biological synapses to express rich functionality in a tunable way, is an important technique to comprehensively emulate the synaptic functions for artificial neuromorphic computing systems. However, the reliable modulation on the synaptic plasticity has not been well realized at the device level due to the...
The out-of-plane optical constants of two-dimensional materials have proven to be experimentally elusive. Owing to the reduced dimensionality of a monolayer, optical measurements have limited sensitivity to these properties, which are hidden by the optical response of the substrate. Therefore, there remains an absence of scientific consensus on how...
Optical memory unit with the ability to detect and store optical signals is increasingly becoming a crucial part of advanced data communication and image sensing technology. Despite great efforts devoted to develop high-performance optical memory devices based on two-dimensional (2D) material, the photoelectric conversion is still limited to defect...
Two-dimensional (2D) metallic transition-metal dichalcogenides (MTMDCs) are considered as ideal electrode materials for enhancing the device performances of 2D semiconducting transition-metal dichalcogenides, due to their similar atomic structures and complementary electronic properties. Vanadium ditelluride (VTe2) behaves as a fascinating material...
Two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs) are promising platforms for developing next-generation electronic and optoelectronic devices due to their unique properties. To achieve this, the growth of large single-crystal TMDs is a critical issue. Unravelling the factors affecting the nucleation and domain orientation...
Magnetic carbon aerogels were prepared from inexpensive and readily available winter melon to adsorb U(VI). The morphology, structure, magnetism, characteristic functional groups and chemical bonds of magnetic carbon aerogels were characterized by TEM, SEM, XRD, BET, VSM, FT-IR, XPS. Under the condition of 303 K and pH 6, magnetic carbon aerogel re...
Two-dimensional (2D) transition metal dichalcogenides (TMDCs) have emerged as perfect platforms for developing applications in nano-electronics, catalysis, energy storage and environmental-related fields due to their superior properties. However, the low-cost, batch production of high-quality 2D TMDCs remains a huge challenge with the existing synt...
Two-dimensional (2D) metallic transition metal dichalcogenides (MTMDCs) supply a versatile platform for investigating newfangled physical issues and developing potential applications in electronics/spintronics/electrocatalysis. Among these, NiTe2 (a type-II Dirac semimetal) possesses a Dirac point near its Fermi level. However, as-prepared 2D MTMDC...
Chemical vapor deposition (CVD) route has emerged as an effective method for the successful syntheses of two-dimensional (2D) materials with satisfactory crystal quality, especially for the syntheses of wafer-scale, thickness uniform or large domain size single-crystal transition metal Chalcogenides (TMCs). To achieve this, the salt-assisted CVD st...
Although metal-organic frameworks (MOFs) show numerous advantages over other crystalline materials, their industrial relevances have been impeded owing to their many drawbacks such as environmental impacts and economic costs of their synthesis. A green preparation pathway could greatly reduce the environmental costs, energy, and the need for toxic...
2D layered materials, such as graphene, transition metal dichalcogenides, and hexagonal boron nitride (h‐BN), cover a broadband in the electromagnetic spectrum with wavelengths ranging from hundred nanometers to millimeters. Their applications in photonic and optoelectronic nano‐devices have been demonstrated frequently, while they still need to be...
Two-dimensional (2D) semiconducting transition metal dichalcogenides (TMDs) have emerged as attractive platforms in next-generation nanoelectronics and optoelectronics for reducing device sizes down to ten nanometer scale. To achieve this, the controlled synthesis of wafer-scale single-crystal TMDs with high crystallinity has been a continuous purs...
A series of environmental and energy issues, such as global warming, water pollution, acid rain, and energy shortage, have to be settled urgently. Metal–organic frameworks (MOFs) are compounds consisting of metal ions or clusters coordinated to organic ligands, which show great promise for alleviating or mitigating these challenges owing to their o...
Owing to its anisotropic optical and electrical properties, rhenium diselenide (ReSe2) has garnered considerable attention recently as a candidate material for polarization-sensitive photodetectors. However, the direct and controllable synthesis of large-sized ReSe2 with a uniform thickness is still a great challenge. Herein, we have refined the sy...
In the development of metal–organic frameworks (MOFs), expansion of pore size and exploration of facile preparation conditions are considered as two major goals that are rarely realized together. This study develops a facile method for the room-temperature synthesis of hierarchically porous MIL-100(Fe) under HF-free conditions using a mixed-ligand...
Vertical heterostructures formed by stacks of two-dimensional (2D) layered materials with disparate electronic properties have attracted tremendous attention for their versatile applications. The targeted fabrication of such vertical stacks with clean interfaces and a specific stacking sequence remains challenging. Herein, we design a two-step chem...
Traditional hydrothermal method (TH) and alkali fusion-assisted hydrothermal method (AFH) were evaluated for the preparation of zeolites from waste basalt powder by using NaOH as the activation reagent in this study. The synthesized products were characterized by BET, XRD, FTIR and SEM. The effects of acid treatment, alkali/basalt ratio, calcinatio...
Metal–organic frameworks (MOFs) are promising adsorbents for extraction of uranium(VI) due to their high surface area and abundant active site. However, the smaller pore size (< 2 nm) and harsh synthesis conditions (e.g., high temperature and pressure) severely hinder MOFs practical applications in some cases. Herein, we developed a simple and faci...
A novel assembly method was used to prepare the sulfhydryl functionalized magnetic SBA-15 (SH-M-SBA-15). The physicochemical properties of SH-M-SBA-15 were characterized by TEM, XRD, EDS, FT-IR, BET, and VSM. Batch adsorption experiments were conducted to investigate the influence of initial uranium concentration, dosage of adsorbent, pH values, co...
An ultrathin layer of hydrophilic titanium dioxide (TiO2) is coated on the gas diffusion layer (GDL) to enhance the performance of a proton exchange membrane fuel cell (PEMFC) at low relative humidity (RH) and high cell temperature. Both of the modified and unmodified GDLs are characterized using contact angles, and the cell performance is evaluate...
Two-dimensional (2D) metallic transition metal dichalcogenides (MTMDCs) have attracted tremendous interest due to their intriguing physical properties and broad application potential. However, batch production of high-quality 2D MTMDCs based on existing synthesis on 2D surfaces remains a huge challenge. Herein, a universal synthetic route for the s...
Palladium diselenide (PdSe2) is an emerging 2D layered material with anisotropic optical/electrical properties, extra‐high carrier mobility, excellent air stability, etc. So far, ultrathin PdSe2 is mainly achieved via mechanical exfoliation from its bulk counterpart, and the direct synthesis is still challenging. Herein, the synthesis of ultrathin...
FeS@Fe3O4 magnetic nanoparticles were prepared by ultrasonic-assisted method and characterized by TEM, FTIR, XRD, SEM, EDS, BET and VSM. The factors affecting the adsorption properties of uranyl ions by FeS@Fe3O4 were studied. Results show that the FeS@Fe3O4 nanoparticles have core–shell structure and superparamagnetism. Under the optimized conditi...
Among two-dimensional (2D) transition metal dichalcogenides (TMDCs), platinum diselenide (PtSe2) stands at a distinct place due to its fancy transition from type-II Dirac semimetal to semiconductor with thickness variation from bulk to monolayer (1 ML), and the related versatile applications especially in mid-infrared detectors. However, achieving...
Using pomelo peels pulp (PPP) as raw material, a new chemically modified PPP was prepared by the process of fermentation, cooking, freeze-drying, and so on. The adsorbent has been characterized by EDS, IR, BET and SEM. The factors of different adsorption conditions such as pH value, adsorption temperature, mass of adsorbent, adsorption time and ini...
Two-dimensional (2D) metallic transition metal dichalcogenides (MTMDCs), the complement of 2D semiconducting TMDCs, have attracted extensive attentions in recent years because of their versatile properties such as superconductivity, charge density wave, and magnetism. To promote the investigations of their fantastic properties and broad application...
Atomically thin transition metal dichalcogenides (TMDCs) have received substantial interests due to their unique thickness-dependent optical and electronic properties, and related applications in optoelectronics. However, the large-scale, thickness tunable growth of such materials are still challenging. Herein, we report a fast growth of thickness...
Two-dimensional (2D) metal-semiconductor transition-metal dichalcogenides (TMDCs) vertical heterostructures play a crucial role in device engineering and contact tuning fields, while their direct integration still being challenging. Herein, a robust epitaxial growth method is designed to construct multiple lattice-matched 2D metal-semiconductor TMD...
The thiol-functional hydrotalcite (Mg/Al-LDO-SH) composite materials were prepared and characterized by EDS, SEM, FT-IR and XRD. The variables influencing the adsorption capacity were investigated. Results show that 3-MPTMS got success in material surface modification. The best optimization condition for adsorption experiment was at time 150 min, p...
Photodetectors based on monolayer molybdenum disulfide (MoS2) have been demonstrated to exhibit good photodetecting capabilities. However, the relatively large bandgap of monolayer MoS2 has inhibited its application in near‐infrared (NIR) photodetectors. Here, the narrow‐bandgap organic semiconductor poly(diketopyrrolopyrrole‐terthiophene) (PDPP3T)...
Monolayer molybdenum sulfide (MoS2), a typical semiconducting transition metal dichalcogenide, has emerged as a perfect platform for next-generation electronics and optoelectronics due to its sizeable band gap and strong light-matter interactions. Nevertheless, the controlled growth of a monolayer MoS2 single-crystal with a large-domain size and hi...
Vertical heterostructures based on two-dimensional (2D) materials have attracted widespread interest for their numerous applications in electronic and optoelectronic devices. Herein, we report the direct construction of an abnormal graphene/ReSe2 stack on Au foils by a two-step chemical vapor deposition (CVD) strategy. During the second growth stag...
Rhenium diselenide (ReSe2) is a unique transition metal dichalcogenides (TMDCs) possessing distorted 1T structure with a triclinic symmetry, strong in-plane anisotropy and promising applications in optoelectronics and energy-related fields. So far, the structural and physical properties of ReSe2 are mainly uncovered by transmission electron microsc...
The realization of low energy-consumption lasers based on atomically thin two-dimensional (2D) transition metal dichalcogenides (TMDCs) are crucial for the development of optical communications, flexible displays, and lasers on the chip level. However, among the as-demonstrated TMDC-based lasers so far, the gain materials are mainly achieved by a m...
The nondestructive and clean transfer of 2D‐layered materials from growth onto target substrates is a key step in their practical applications. Some nonetching transfer methods are developed to avoid contaminations from chemical etchants, while the influences of other transfer media, such as the commonly used water, are rarely explored. Herein, a o...
Rhenium diselenide (ReSe2), which bears in-plane anisotropic optical and electrical properties, is of considerable interest for its excellent applications in novel devices, such as polarization-sensitive photodetectors and integrated polarization-controllers. However, great challenges to date in the controllable synthesis of high-quality ReSe2 have...
Rhenium diselenide (ReSe2) has recently garnered great research interest due to its distorted 1T structure, anisotropic physical properties, and applications in polarization-sensitive photodetectors. However, ReSe2 synthesized by chemical vapor deposition (CVD) is usually a multilayer/polycrystalline material containing numerous grain boundaries, t...
Mixed-dimensional van der Walls heterostructures between one dimensional (1D) perovskite nanowires and two dimensional (2D) transition metal dichalcogenides (TMDCs) hold great potentials for novel optoelectronics and light harvesting applications. However, the ultrafast carrier dynamics between the 1D perovskite and 2D TMDCs is currently not well u...
Monolayer transition metal dichalcogenides (TMDs) have become essential two-dimensional materials for their perspectives in engineering next-generation electronics. For related applications, the controlled growth of large-area uniform monolayer TMDs is crucial, while it remains challenging. Herein, we report the direct synthesis of 6-inch uniform m...
Manipulating strong light-matter interaction in semiconductor microcavities is crucial for developing high-performance exciton polariton devices with great potentials in next-generation all-solid state quantum technologies. In this work, we report surface plasmon enhanced strong exciton-photon interaction in CH3NH3PbBr3 perovskite nanowires. Charac...
Manipulating strong light-matter interaction in semiconductor microcavities is crucial for developing high-performance exciton polariton devices with great potentials in next-generation all-solid state quantum technologies. In this work, we report surface plasmon enhanced strong exciton-photon interaction in CH3NH3PbBr3 perovskite nanowires. Charac...
Van der Waals heterojunctions of 2D layered semiconductors and nonlayered technological important II–V semiconductors provide unprecedented opportunities to engineer exciton and carrier dynamics in 2D optoelectronic devices. However, fabrication of such artificial heterojunctions with type-II band alignment structure and realization of interlayer e...
In article number 1702359, Yanfeng Zhang and co-workers report a van der Waals epitaxy route for the chemical vapor deposition growth of few-layer metallic 1T-phase VSe2 crystals on mica substrates, and uncover its extra-high electrical conductivity and thickness-dependent charge-density wave transitions. This work sheds light on the synthesis and...
Controlled synthesis of structurally anisotropic rhenium diselenide (ReSe2) with macroscopically uniform and strictly monolayer thickness as well as tunable domain shape/size is of great interest for electronics-, optoelectronics-, and electrocatalysis-related applications. Herein, we describe the controlled synthesis of uniform monolayer ReSe2 fla...
D metallic transition-metal dichalcogenides (MTMDs) have recently emerged as a new class of materials for the engineering of novel electronic phases, 2D superconductors, magnets, as well as novel electronic applications. However, the mechanical exfoliation route is predominantly used to obtain such metallic 2D flakes, but the batch production remai...
Van der Waals heterostructures have attracted attention worldwide owing to their novel properties and diverse potential applications. Particularly, vertically stacked MX2/graphene (MX2/Gr, M=Mo, W; X=S, Se, etc.) and MX2/MX2 heterostructures have demonstrated their superiority in electronics, optoelectronics and some energy-related applications. In...
Stacked transition-metal dichalcogenides on hexagonal boron nitride (h-BN) are platforms for high-performance electronic devices. However, such vertical stacks are usually constructed by the layer-by-layer polymer-assisted transfer of mechanically exfoliated layers. This inevitably causes interfacial contamination and device performance degradation...
