Synthesis Routes And Applications Exploring Of Two-Dimensional Antimonene

Experimental research of the group-VI elemental two-dimensional antimonene,compared to the DFT simulation research of its structure and properties,still need further investigation,including fabrication of mono-layered antimonene,massive preparation and more application explorations.Except for the realization of small-domain antimonene via the utilization of molecular beam epitaxy system,to obtain large-scale antimonene nanosheets is still of urgency.And,further study of the properties and applications of antimonene film.Another topic of antimonene research is to solve massive preparation of antimonene nanosheets while massive preparation of also of great importance for many application research,including Li/Na ion batteries,catalysis and composite materials.This thesis begins the introductions of the study of antimonene from the the preparation of antimonene.And,beneficial attempts were made for its application in transparent conductive films and optical limiting field.The whole thesis is divided into the following three parts:1.Van der Waals epitaxy of antimonene nanosheetsVapor deposition epitaxy system owns distinct advantages in costs,film quality and lateral sizes.In this section,after comparing the antimony epitaxy effect of sapphire,pre-oxidized silicon wafer and mica substrate,mica was selected for van der Waals growth of antimonene and micrometer-scaled few-layer antimonene were successfully prepared.The products were further confirmed to be?phase structure by Raman spectrometer and HRTEM.The epitaxial mechanism of antimonene vapor adsorption nucleation and migration on mica surface was proposed.By comparing the Raman spectra,AFM and EDS spectra of antimonene after storage for one month,it is confirmed that antimonene has good environmental stability.The thickness dependent Raman spectra obtained by the measurement and the variation law of E_gand A_1gvibration peaks with the thickness was summarized,which laid a good foundation for the convenient characterization of antimonene.Finally,the transparent conductive thin film samples of oligoantimonene were prepared by utilizing the good electrical conductivity and excellent optical transmittance of antimonene in the visible light range of 400 nm-700 nm,together with good flexibility of mica.2.Bottom-up synthesis of antimoneneIn many research fields of two-dimensional materials,such as electrocatalysis,lithium/sodium batteries and composites,massive production of materials is an indispensable prerequisite.The characteristics of low conversion rate,high solvent toxicity and large interlayer force during luqid exfoliation of antimonene made trouble.Aimed at these problems,this section successfully prepared antimonene by the bottom-up synthesis reaction of aluminum powder and antimony trichloride hydrolysate in the water/ethanol system.The synthesis temperature can dramatically affect the morphology of the products.The low-temperature synthesis results in the antimony nanoparticles and coral-like products,while higher reaction temperature is beneficial for the synthesis of nanosheets.By further adjusting the experimental parameters,gram-scale antimonene nanosheet assemblies can be easily prepared and the product quality is not significantly degraded.Therefore,this method effectively ensures the mass preparation of high-quality three-dimensional antimonene nanosheet assemblies.3.Optical Limiting performance research of antimoneneThe interaction between two-dimensional materials and laser has always been an important research topic.The first-principles calculation shows that the optical absorption rate of monolayer antimonene with wide band gap is very low in the visible region,so,there is the possibility of two-photon absorption.Simulation and experimental results show multilayer antimonene has metallic properties and its interaction with laser needs further study.In this study,the optical and surface properties of antimony nanostructures obtained by hydrothermal synthesis were firstly studied.The OA and CA Z-scan tests of as-prepared antimoy showed that the antimonene dispersion had good optical limiting performance and could be used as a laser protective material.At the same time,the scattering signal test shows that the antimonene dispersion has a good nonlinear scattering effect on the laser.A sharp valley and a wide peak were obtained by peak fitting of the Z-scan curve of the hole opening,indicating that the saturation absorption effect between antimonene and laser may be caused by surface oxidation.