Two-dimensional crystals have emerged as a class of materials that may impact future electronic technologies. Experimentally identifying and characterizing new functional two-dimensional materials is challenging, but also potentially rewarding. Here, we fabricate field-effect transistors based on few-layer black phosphorus crystals with thickness down to a few nanometres. Reliable transistor performance is achieved at room temperature in samples thinner than 7.5 nm, with drain current modulation on the order of 10(5) and well-developed current saturation in the I-V characteristics. The charge-carrier mobility is found to be thickness-dependent, with the highest values up to ∼ 1,000 cm(2) V(-1) s(-1) obtained for a thickness of ∼ 10 nm. Our results demonstrate the potential of black phosphorus thin crystals as a new two-dimensional material for applications in nanoelectronic devices.

http://absimage.aps.org/image/MAR14/MWS_MAR14-2013-005031.pdf

Black Phosphorus Field-effect Transistors

Two-dimensional (2D) molybdenum disulfide (MoS2)–based materials are of great interest because of their capacity to efficiently absorb electromagnetic spectrum in the visible region. Starting from the structural and electronic properties, this review discusses the synthesis strategies of 2D MoS2. The major photocatalytic applications of 2D MoS2 such as hydrogen evolution, pollutant degradation, self-cleaning, photoelectrochemical water splitting, and microbial disinfection are summarized. The mechanistic understanding of various photocatalytic applications of 2D MoS2 is summarized through schematic diagrams. In addition, this review outlines the methodologies for improving the 2D MoS2 photocatalysts and recapitulates the research directions in this area of semiconductor photocatalysis.

2D MoS2: structure, mechanisms, and photocatalytic applications

The influence of transition metal (TM) atoms (Au, Ag) doping on the structure parameters and electronic properties of MoS2 monolayer was studied based on DFT calculations. In order to realize the adsorption mechanism, the adsorption structures, adsorption energy, charge transfer, density of states (DOS), and electron density difference of water (H2O) molecule absorbed on two kinds of doped-MoS2 monolayer were analyzed. The results show that the electronic properties of TM (Au, Ag) doped-MoS2 monolayer have significantly changes and the chemical activity is obviously enhanced compared with the MoS2 monolayer. Moreover, Au or Ag doped-MoS2 monolayer both exhibits excellent adsorption capacity to H2O molecule and the processes of absorption both are chemical.

Adsorption of H2O molecule on TM (Au, Ag) doped-MoS2 monolayer: A first-principles study

In this comprehensive investigation, we undertook an ab initio exploration of the pressure-dependent structural, elastic and thermodynamic attributes of lithium-based halide perovskite compounds, namely CaLiCl3, CaLiBr3 and CaLiI3. Our analytical approach encompassed a diverse set of parameters, and the main conclusions and implications of our study are summarized as follows: (i) Calculated values of formation enthalpy and cohesion energy were determined for these perovskite compounds. Our results notably affirm the structural and thermodynamic stability of these materials in their cubic lattice configuration. (ii) Our optimized network parameters, derived from ab initio calculations, demonstrated commendable congruence with previously established theoretical predictions. This agreement strengthens the credibility of our conclusions. (iii) Using strain-constraint methodology, we successfully estimated the single-crystal elastic constants (Cij) of these compounds. This data served as the basis for further analysis. (iv) Using the obtained Cij values, we calculated a complete suite of elastic moduli for CaLiX3 (X = Cl, Br and I) in polycrystalline aggregates. This encompassed bulk modulus, Young's modulus, shear modulus, Lame coefficients, Poisson's ratio and Debye temperature, thus providing valuable information on the mechanical behavior of materials. (v) Using Debye's quasi-harmonic approach, we systematically investigated the temperature dependencies of several essential thermodynamic properties. These include the lattice parameter, thermal expansion coefficient, bulk modulus, Debye temperature, and isochoric and isobaric heat capacities. These analyzes covered a wide temperature range while maintaining fixed selected pressures. Overall, our study aims to provide the scientific community with a robust and comprehensive dataset regarding the structural, elastic, and thermodynamic attributes of CaLiX3 perovskite compounds. 

Ab initio predictions of pressure-dependent structural, elastic, and thermodynamic properties of CaLiX3 (X = Cl, Br, and I) halide perovskites

The MoS2 nanostructures have been synthesized with the variation of Mo/S molar ratios of 1:2, 1:3, 1:4, 1:5, and 1:6 using a simple hydrothermal method. The (002) peak at 2θ ∼ 14° in the X-ray diffraction (XRD) pattern confirms the hexagonal phase of the synthesized MoS2 nanostructures, which agrees well with Raman and high-resolution transmission electron microscopy study. Furthermore, field emission scanning electron microscopy analysis reveals that the synthesized MoS2 with Mo/S molar ratios of 1:5 and 1:6 exhibits a nanoflower-like structure, significantly enhancing the photocatalytic activity. The methylene blue (MB) and phenolphthalein dye degradation efficiencies and rate constants of MoS2 are enhanced with the rise of Mo/S molar ratio under sunlight illumination. Specifically, MoS2 nanoflowers with a 1:5 molar ratio showed the maximum MB dye degradation efficiency of 98% and a rate constant of 0.132 cm–1 in 25 min of sunlight illumination. In addition, a maximum photocurrent density of 22 mA/cm2 has been achieved at −0.6 V vs Ag/AgCl for a 1:5 molar ratio sample. Moreover, the lowest charge-transfer resistance, highest carrier density, and carrier mobility enhance the photocatalytic activity of the 1:5 molar ratio sample with better separation of charge carriers and reduced carrier recombination rate. Hence, the synthesized MoS2 nanostructures with a 1:5 molar ratio of Mo/S are the optimized sample with enhanced photocatalytic and photoelectrochemical performances. The electronic and photocatalytic properties of MoS2 have been investigated theoretically with the variation of the layer number. 

Synthesis of MoS2 Nanoflowers for Photocatalytic Degradation of Organic Dyes

Effect of molecular weight of polyethylene glycol on the sheet-thickness and photocatalytic performance of MoS2 nanoparticles

Exploration of Na2.9V1.9Ti0.1(PO4)3@C as novel cathode material for aqueous zinc-ion batteries

The NASICON-structure Na3V2(PO4)3 is attracted lots of attention due to its three-dimensional ion diffusion channels, high discharging platform and small volume deformation, which has become the most potential cathode material candidates for aqueous zinc-ion batteries. Nevertheless, we found that [email protected] undergoes a structural phase change which is converted to composite (V2O5, NaV3(PO4)3, Zn3V4(PO4)6) after 50 cycles in this study. Here, we exploited the in-situ generation of composite by cycling the [email protected] batteries at 60 °C for only 1 cycle ([email protected] °C) to promote the performance of cathode material for aqueous zinc-ion batteries. The [email protected] ℃ display a high capacity of 164 mA h g−1 at 100 mA g−1 and excellent rate performance (155 mA h g−1 at 1000 mA g−1) are realized. This is the first reported in-situ generation of composite as a cathode material for aqueous zinc-ion batteries so far. This work breaks the original conventional thinking to present new insight to developing cathode materials for zinc energy storage. 

New Insight of In-situ Generation of Composite Cathode by Converting Na3V2(PO4)3@C to Improve Aqueous Zinc-ion Batteries’ Performance

Perovskite SrVO3 as novel cathode materials for high-rate aqueous zinc-ion batteries

Perovskite Srvo 3  As Novel Cathode Materials for High-Rate Aqueous Zinc-Ion Batteries

Handle everyday research tasks with reliable, citation-backed results

Your personal Research Agent to handle research tasks with citation-backed results

Popular Tasks used by Researchers

How can I help with your research?

Meet SciSpace

Get more enhanced response by uploading the PDFs you want me to reference.

No relevant PDFs in your library

SciSpace is the AI research assistant for academics. Run systematic literature reviews on 280M+ papers, and write papers with cited sources. Trusted by 1M+ students, PhDs & researchers.

SciSpace | AI for Research

Analyze PDFs

Code & Manuscripts

Funding & Grants

Literature & Patents

Medical & Clinical Data

Systematic Review

Visualize & Present

Web & Data

Build a Google Scholar-like website for your research.

Build a website

Create charts and images for your research

Create a Chart

Write a paper for submission to a journal

Draft a manuscript

Patent Search

Design eye-catching scientific posters in minutes.

Scientific Poster Generation

Systematic Literature Review

One task is running at the moment. Your messages will be shown right after.

Drag and drop or click here to browse

Loved by <highlight>1 million+</highlight> researchers

Extract a list of specific topics and their sources from unstructured text

Topics

Compare and analyze relevant papers that matches with your search

Papers

Get insights from PDFs and bookmarked papers from your library

My library

Recent searches

Try searching for:

Catch AI-generated content in scholarly and non-scholarly content

{ai} Detector

Ai Writer

Get PDF Summaries, highlighted text explanations 

Chat with PDF

Effortlessly create in-text citations and bibliographies in APA and 2,500 other formats

Citation generator

Get explanations, summaries, and answers on academic papers

Ease up your research workflow with {scispace}'s cohort of exciting AI tools

Elevate your academic writing skills and convey your ideas the way you want

Paraphraser

Explore our range of reading and writing tools

Your file is being prepared and should be ready in a few minutes. If it's a large file, it might take a bit longer. You can close this window, and we'll email you the file when it's done.

You have reached a maximum limit of <strong>{limit}</strong> columns in the table. Remove at least <strong>1</strong> column to add or create another one.

Pingping Lei

Author Tools

Chat about Author

Papers

Effect of molecular weight of polyethylene glycol on the sheet-thickness and photocatalytic performance of MoS2 nanoparticles

Exploration of Na2.9V1.9Ti0.1(PO4)3@C as novel cathode material for aqueous zinc-ion batteries

New Insight of In-situ Generation of Composite Cathode by Converting Na3V2(PO4)3@C to Improve Aqueous Zinc-ion Batteries’ Performance

Perovskite SrVO3 as novel cathode materials for high-rate aqueous zinc-ion batteries

Perovskite Srvo 3 As Novel Cathode Materials for High-Rate Aqueous Zinc-Ion Batteries