Synthesis Of Copper Sulfide Nanocrystals Research Articles

Morphology and composition-controllable synthesis of copper sulfide nanocrystals for electrochemical reduction of CO2 to HCOOH

Electrochemical conversion of CO2 into value-added chemicals such as formic acid (HCOOH) has gained tremendous interests. Sulfide-derived copper has been shown recently to be selective for HCOOH production. However, the rich composition and morphology variation of copper sulfides on their electrochemical CO2 reduction have yet to be investigated. Herein, we report a simple ethylene glycol solvothermal route to synthesize copper sulfides nanocrystals, with their morphology and composition varied by tuning the Cu/S feed ratio and reaction temperatures. When being applied to the electrochemical reduction of CO2 to HCOOH, CuS nanoflowers exhibited high Faradic efficiency (~52%) due to its high S content and specific morphology, compared to their more Cu-rich counterparts.

Colloidal copper sulfide nanocrystals: Electrochemical, electrical and morphological properties

ABSTRACTThe highlight of this work is the synthesis of copper sulfide nanocrystals by a simple one-pot colloidal process, and the study of its electrochemical, electrical and morphological properties. Nanocrystals of Cu1.8S of about 15-30 nm were obtained at a temperature of 240°C under an argon atmosphere. The colloidal solution of the nanocrystals was analyzed by cyclic voltammetry. Agreeing to the values of EOx and ERedvs. SCE, and the average of three samples the HOMO and LUMO levels are 6.16 and 4.27 eV, respectively, the calculated HOMO – LUMO (Eg) is 1.89 eV. The Eg value, differs of that value obtained from Kubelka-Munk equation (1.7 eV). The photocurrent vs. time results showed that the Cu1.8S/Cu junction is photosensitive and could be used as absorbing material. The morphology and the topography of the film were analyzed by SEM and AFM techniques. Irregular agglomeration of nanocrystals was observed and a roughness of about 194 nm.

Single precursor synthesis of copper sulfide nanocrystals using aerosol spray pyrolysis

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Low-temperature synthesis of copper sulfide nano-crystals of novel morphologies by hydrothermal process

Different morphological images of copper sulfide nano-crystals, e.g., butterfly-like, twin-hexagonal star-like, triangle polyhedral-like and nut-like, have been successfully synthesized by different hydrothermal processes without surfactant assistance. The reactions were carried through Cu(ac) 2 complexed by citric acid with thiourea for 24 h at an appropriate temperature. The experimental results revealed that temperature, molar ratio, concentration of the precursor and solvent had effects on the morphology and composition of copper sulfide nano-crystals.

Shape-controlled synthesis of copper sulfide nanocrystals via a soft solution route

Copper sulfide (CuS) nanocrystals with special morphologies, such as flower- and trepang-like morphology have been successfully synthesized via a simple and convenient solution route at low temperature from shuttle-like CuO crystals. The morphology of the products can be easily controlled by choosing appropriate solvent as the reaction medium. Studies found that the copper source and reaction time also have important influence on the morphology of the final products.