Sodium dodecyl benzene sulfonate-assisted synthesis through a hydrothermal reaction

The effects of the anionic surfactant on the morphology, size and crystallization of NiSe precipitated from NiCl2·6H2O and SeCl4 in presence of hydrazine (N2H4·H2O) as reductant were investigated. The products have been successfully synthesized in presence of sodium dodecyl benzene sulfonate (SDBS) as surfactant via an improved hydrothermal route. A variety of synthesis parameters, such as reaction time and temperature, capping agent and amount of reducing agent have a significant effect on the particle size, phase purity and morphology of the obtained products. The sample size became bigger with decreasing reaction temperature and increasing reaction time. In the presence of 2 ml hydrazine, the samples were found to be the mixture of Ni3Se2 and NiSe. With increasing the reaction time and amount of hydrazine a pure phase of hexagonal NiSe was obtained. X-ray diffraction analysis (XRD), scanning electron microscope (SEM) and transmission electron microscopy (TEM) images indicate phase, particle size and morphology of the products. Chemical composition and purity of the products were characterized by X-ray energy dispersive spectroscopy (EDS). Photoluminescence (PL) was used to study the optical properties of NiSe samples.

Reaction of a SeCl4 aqueous solution with a NiCl2·6H2O aqueous solution in presence of sodium dodecyl benzene sulfonate (SDBS) as capping agent and hydrazine (N2H4·H2O) as reductant, produces nanosized nickel selenide through a hydrothermal method. The effect of temperature, reaction time and amounts of reductant on the morphology, particle sizes of NiSe nanostructures has been investigated.Figure optionsDownload as PowerPoint slideHighlights
► NiSe nanostructures were synthesized by hydrothermal method.
► A novel Se source was used to synthesize NiSe.
► SDBS as capping agent plays a crucial role on the morphology of products.
► A mixture of Ni3Se2 and NiSe was prepared in the presence of 2 ml hydrazine.
► A pure phase of NiSe was prepared in the presence of 4 or 6 ml hydrazine.