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In this study, cobalt disulfide (CoS 2 ) nanoparticles have been successfully synthesized through a simple and facile solvothermal method. The experiments were carried out based on the thermodynamic calculations using FactSage software. The black nano-sized CoS 2 powder has been produced in an autoclave reactor. The reaction parameters, such as the ratio of primary salts, effect of solvents, temperature and surfactant were optimized to obtain fine and uniform nanoparticles. The band gap energy of the samples was measured with butler relations. The results proved the production of highly pure CoS 2 nanoparticles with a semi-spherical morphology. [ABSTRACT FROM AUTHOR]

Highlights: [•] Taguchi confirmed the optimum conditions of S/Co ratio 8 and reaction temperature 70°C. [•] Modeling by ANFIS showed the interaction between temperature of reaction and S/Co ratio. [•] To minimize band-gap energy, temperature and precursor ratio are effective parameters. [ABSTRACT FROM AUTHOR]