Zhakypov Alibek S, Nemkayeva Renata R, Yerlanuly Yerassyl, Tulegenova Malika A, Kurbanov Beibarys Y, Aitzhanov Madi B, Markhabayeva Aiymkul A, Gabdullin Maratbek T
Kazakh-British Technical University, 59 Tole Bi, 050000, Almaty, Kazakhstan.
Al-Farabi Kazakh National University, 71 Al-Farabi Av., 050040, Almaty, Kazakhstan.
Sci Rep. 2023 Sep 21;13(1):15714. doi: 10.1038/s41598-023-41631-2.
This work presents a one-step controlled method for the synthesis of copper oxide nanoparticles using an arc discharge in deionized water without subsequent thermal annealing. The synthesis conditions were varied by changing the arc discharge current from 2 to 4 A. Scanning electron microscopy images of samples synthesized at discharge current of 2 A revealed the formation of tenorite (CuO) nanopetals with an average length of 550 nm and a width of 100 nm, which had a large surface area. Arc discharge synthesis at 3 and 4 A current modes provides the formation of a combination of CuO nanopetals with spherical cuprite (CuO) nanoparticles with sizes ranging from 30 to 80 nm. The crystalline phase and elemental composition of the synthesized particles were identified by X-ray diffraction analysis, Raman spectroscopy and Energy dispersive analysis. As the arc discharge current was raised from 2 to 4 A, two notable changes occurred in the synthesized particles: the Cu/O ratio increased, and the particle sizes decreased. At 4 A, the synthesized particles were from 30 to 80 nm in size and had a spherical shape, indicating an increase in the amount of cuprite (CuO) phase. The optical band gap of the aqueous solutions of copper oxide particles also increased from 2 to 2.34 eV with increasing synthesis current from 2 to 4 A, respectively. This suggests that the proposed synthesis method can be used to tune the band gap of the final material by controlling the Cu/O ratio through the current of arc discharge. Overall, this work demonstrates a novel approach to the synthesis of copper oxide nanoparticles with controllable CuO/CuO/Cu ratios, which has the potential to be useful in a variety of applications, particularly due to the significant enhancement of photocatalytic abilities and widen the working spectral range.
这项工作提出了一种一步控制法，用于在去离子水中通过电弧放电合成氧化铜纳米颗粒，无需后续热退火。通过将电弧放电电流从2 A改变到4 A来改变合成条件。在2 A放电电流下合成的样品的扫描电子显微镜图像显示，形成了平均长度为550 nm、宽度为100 nm的黑铜矿（CuO）纳米花瓣，其具有较大的表面积。在3 A和4 A电流模式下的电弧放电合成提供了CuO纳米花瓣与尺寸范围为30至80 nm的球形赤铜矿（Cu₂O）纳米颗粒的组合。通过X射线衍射分析、拉曼光谱和能量色散分析确定了合成颗粒的晶相和元素组成。随着电弧放电电流从2 A提高到4 A，合成颗粒发生了两个显著变化：Cu/O比增加，颗粒尺寸减小。在4 A时，合成颗粒的尺寸为30至80 nm，呈球形，表明赤铜矿（Cu₂O）相的量增加。随着合成电流从2 A增加到4 A，氧化铜颗粒水溶液的光学带隙也从2 eV增加到2.34 eV。这表明所提出的合成方法可用于通过电弧放电电流控制Cu/O比来调节最终材料的带隙。总体而言，这项工作展示了一种合成具有可控CuO/Cu₂O/Cu比的氧化铜纳米颗粒的新方法，该方法在各种应用中具有潜在用途，特别是由于光催化能力的显著增强和工作光谱范围的拓宽。
