Synthesis Of Copper Sulfides By Polyol Based Solution Chemical Process

Among transition metal chalcogenides,copper sulfides are extremely attracting because they combine favorable optical properties with low toxicity,low cost and earth-abundance,which makes them appealing in diverse fields,including photocatalysis,solar cells,sensors,lithium ion batteries and supercapacitors.Recently,the localized surface plasmon resonance?LSPR?of copper sulfides in the near infrared region was paid a increased attention.In this paper,we developed a facile,green and ambient pressure triethylene glycol based hot injection to prepare copper sulfides with different phases and morphologies.These products were characterized by SEM,EDS,XRD and TEM to investigate the influence of experimental parameters,including reaction temperatures and sulfur sources and so on.In addition,The localized surface plasmon resonances?LSPR?related absorption of the typical synthesized products and their dependence on phase and morphology were investigated.The results showed that flower-like CuS hierarchical structures could be prepared by using sulfur powder as sulfur source and the precursor ratio S/Cu of 2 at injection and refluxing temperature of 220°C/200°C for refluxing time of 30min.Based on that,the adding of 0.01 mL TETA could lead to the formation of CuS nanoplates.When thiourea used as sulfur source,different phases and morphologies of copper sulfides could be obtained.The products of CuS-Cu₉S₅ mixture could be obtained at temperature of 240°C/220°C and below.Cu₉S₅ nanoparticles and Cu₇S₄nanoparticles could be synthesized at temperature of 240°C/220°C and 260°C/240°C with the ratio S/Cu of 2,respectively.Moreover,the typical samples of flower-like CuS hierarchical structures,CuS nanoplates,CuS-Cu₉S₅ mixtures,Cu₉S₅nanoparticles and Cu₇S₄ nanoparticles all exhibited broad absorption in the near infrared region.However,the samples of CuS compound showed stronger absorption,and the absorption of CuS nanoplates was stronger than that of flower-like CuS hierarchical structures,revealing the dependence of localized surface plasmon resonance?LSPR?related absorption on phases and morphologies of products.