PROBLEM TO BE SOLVED: To provide a method capable of mass-producing copper selenium nanoparticles having a small half-value and half width of an absorption peak by strongly absorbing light having a wavelength in the near-infrared region. A method for producing copper selenium nanoparticles by a flow process, wherein a copper starting material and a ligand are combined to form a fluid copper precursor, and the selenium starting material is suspended in a liquid to flow. The step of forming a sex selenium precursor, the step of combining a fluid copper precursor and a fluid selenium precursor to form a fluid copper-selenium mixture, and passing the fluid copper-selenium mixture through at least one heating unit. The fluid copper-selenium mixture comprises a step of forming copper selenium nanoparticles and a step of isolating copper selenium nanoparticles in an oxygen-deficient environment, and the fluidized copper-selenium mixture contains copper selenium nanoparticles. The isolation step involves precipitating copper selenium nanoparticles by combining a solution containing copper selenium nanoparticles with a deoxidized high polar solvent, which is more polar than low polar solvents. .. [Selection diagram] Fig. 2
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