In this study, the electric spark discharge method was used to prepare a cuprous iodide nanocolloid (CuINC); specifically, an electrical discharge machine was used to prepare a CuINC under five sets of pulse width modulation (Ton–Toff) parameters, and ultraviolet–visible spectrophotometry and a zetasizer were used to evaluate the most suitable parameter set. Copper wires were used as electrodes (copper content = 99.7%, diameter = 1 mm), and deionized water mixed with iodine was used as the dielectric fluid. The analysis results indicated that the CuINC prepared under Ton–Toff = 10–10 µs had absorbance of 1.8 and a zeta potential of − 31.9 mV. The resultant CuINC had the highest concentration and suspension stability; this indicated that Ton–Toff = 10–10 µs is the most suitable parameter combination for preparing a CuINC. X-ray diffraction revealed a complete CuI crystal structure. Transmission electron microscopy images showed that most of the CuI nanoparticles were smaller than 5 nm and that the nanoparticles were evenly dispersed. The electric-discharge-based production process employed in this study is rapid and simple, and the end products have favorable suspension power. The method is a safe, environmentally friendly, and rapid method of preparing CuINCs.

本研究采用电火花放电法制备了碘化亚铜纳米胶体（CuINC）；具体而言，使用放电机在五组脉宽调制 (Ton-Toff) 参数下制备 CuINC，并使用紫外-可见分光光度法和 zetasizer 评估最合适的参数组。铜线用作电极（铜含量 = 99.7%，直径 = 1 mm），混合碘的去离子水用作介电流体。分析结果表明，在 Ton–Toff = 10–10 µs 下制备的 CuINC 的吸光度为 1.8，zeta 电位为 - 31.9 mV。所得CuINC具有最高的浓度和悬浮稳定性；这表明 Ton–Toff = 10–10 µs 是最适合制备 CuINC 的参数组合。X 射线衍射揭示了完整的 CuI 晶体结构。透射电子显微镜图像显示，大多数 CuI 纳米颗粒小于 5 nm，并且纳米颗粒分散均匀。本研究采用的基于放电的生产工艺快速简单，最终产品具有良好的悬浮能力。该方法是一种安全、环保、快速的CuINCs制备方法。