This work aims at investigating the conversion of Cu₂O/Cu nanoparticles, prepared by green synthesis using artichoke extract, with ascorbic acid (AA) in one-bath process: a totally green method for production of pure Cu particles. Different pH values of the solution were studied to assess the conversion to Cu phase particles. It was found that by using the optimum synthesis conditions for the production of Cu₂O/Cu nanoparticles and adding at the end of the synthesis AA, the conversion of Cu₂O phase to pure Cu phase was possible when the pH of the solution was 8 or 10, but not when it was 12. The size of particles increased from nano to micron-sized after adding AA and multi-shaped particles with spherical, triangular, cubical and rod like shapes were formed, depending upon the pH of the synthesis solution. The electrical resistivity of the obtained pure Cu microparticles was studied after low-temperature sintering at different times and after preparing compact powder discs. After sintering for 30 min at 180 C, discs showed resistivity of 2.9 10^–3 Ωcm and after sintering for 60 min at 180 C the resistivity lowered to 5.1 10^–4 Ωcm. It can be concluded that the low resistivity of powder discs mainly depended on the size of Cu particles and sintering time, when using a fixed sintering temperature. The present synthesis of pure Cu phase microparticles is simple, convenient, environmentally friendly, cost-effective, it does not useinert gases, it is performed in aqueous media and the produced Cu particles are suitable for low electrical resistivity applications.

本工作旨在研究使用朝鲜蓟提取物通过绿色合成制备的 Cu ₂ O/Cu 纳米颗粒与抗坏血酸 (AA) 在一浴法中的转化：一种生产纯铜颗粒的完全绿色方法。研究了溶液的不同 pH 值以评估向 Cu 相颗粒的转化。研究发现，采用最佳合成条件制备Cu ₂ O/Cu纳米颗粒，并在合成结束时加入AA，Cu ₂当溶液的pH值为8或10时，O相可能变成纯Cu相，而当溶液pH值为12时，则不能。加入AA后，颗粒尺寸从纳米级增加到微米级，球形、三角形、形成立方体和棒状形状，这取决于合成溶液的 pH 值。对所得纯铜微粒在不同时间低温烧结后和制备致密粉末盘后的电阻率进行了研究。在 180 C 下烧结 30 分钟后，圆盘显示电阻率为 2.9 10 ^–3 Ωcm，在 180 C 下烧结 60 分钟后，电阻率降至 5.1 10 ^–4Ωcm。可以得出结论，当使用固定的烧结温度时，粉末圆盘的低电阻率主要取决于Cu颗粒的尺寸和烧结时间。目前纯铜相微粒的合成简单、方便、环保、经济，不使用惰性气体，在水介质中进行，制备的铜颗粒适用于低电阻率应用。