Synthesis And Characterization Of Tin Sulfide And Lead Sulfide Nanomaterials

Preparation of chalcogenides micro/nanomaterials with novelstructures and exploring their growth mechanism, then realization thecontrol of size, dimension and phase, which is significant for people todesign and synthesis functional materials in accordance with their wishes.IV–VI metal chalcogenides are important narrow band gapsemiconductor materials, which was widely used in photovoltaicsequipment and infrared detectors because of their excellent luminescenceproperties, nonlinear optical properties, quantum size confinement effectsand other physical chemistry property. The article choose therepresentative IV–VI metal chalcogenides as the research object,prepared micro/nanocrystals with different morphology and explore theirformation mechanism and properties. The main contents are summarizedas follows.1. Tin sulfide （SnS） nanoflowers were synthesized in EthyleneGlycol solvent using SnCl₂.2H₂O and TAA as raw materials, PVP assurfactant, what’s more, the formation process and the application wasalso investigate. The obtained products were characterized by XRD, SEM,TEM, HRTEM and N₂gas adsorption-desorption isotherm. Theinvestigation shown that the prepared SnS nanoflowers exhibit excellentelectrochemical properties when used as anode materials in lithium ionbatteries; furthermore, the prepared product shown high photocatalyticactivity for the decomposition of Rhodamine B under visible-light.2. Lead sulfide （PbS） nanosheets were synthesized via ahydrothermal route using Pb（NO₃）₂and L-cysteine as starting materialswith a small amount of ethylenediamine as additive. Time-dependentexperiments were carried out to understand the evolution process and thegrowth mechanism of the PbS sheets. Moreover, the experimental resultsalso showed that the amount of ethylenediamine has a significantinfluence on the morphology of the product. 3. Tin disulfide hexagonal nanosheets were synthesized through ahydrothermal route by the reaction between SnCl₂.4H₂O and CS₂insodium hydroxide alkaline solution. The influence of experimentalparameters （including reaction temperature, the amount of sodiumhydroxide and carbon disulfide） in determining the morphologies andphase of final products were also discussed. The SnS₂hexagonalnanosheets were characterized by XRD, FESEM, TEM and HRTEM etc.The current-voltage test showing that the prepared SnS₂productsexhibited excellent optical conductivity, which means it has potentialapplications in light-controlled devices; photocatalytic test indicate thatthe prepared product showing high photocatalytic activity for thedecomposition of methylene blue under UV-vis irradiation.