In this study, nano Cu₂O-Cu/alginate was synthesised by the chemical reduction of tetra-amminecopper (II) ion complexes soluble using hydrazine as a reducing agent and alginate as a stabiliser. The influence of various copper ion concentrations on particle size and morphology of produced nano Cu₂O-Cu/alginate was investigated. The transmission electron microscopy (TEM) analysis and X-ray diffraction (XRD) measurement revealed that the synthesised nano Cu₂O-Cu/alginate was mostly composed of Cu₂O-Cu in the form of a Cu₂O@Cu core–shell structure with particle sizes of 4.2, 5.3, and 8.4 nm for 60, 80, and 100 mM of copper ion initial concentrations, respectively. The obtained nano Cu₂O-Cu/alginate exhibited high antibacterial activity against Xanthomonas oryzae pv. Oryzae (Xanthomonas OO). The results showed that the nano Cu₂O-Cu/alginate containing 30 mg.l⁻¹ of copper ions completely inhibited the growth of Xanthomonas OO bacteria, which are responsible for the rice leaf blight disease. Nano Cu₂O-Cu/alginate materials can be used as a fungicide to replace toxic agro-chemicals and potentially applied to the development of sustainable agricultural production.

在本研究中，以肼为还原剂，海藻酸盐为稳定剂，通过化学还原可溶的四氨铜 (II) 离子络合物，合成了纳米 Cu ₂ O-Cu/海藻酸盐。研究了各种铜离子浓度对制备的纳米Cu ₂ O-Cu/藻酸盐的粒径和形貌的影响。透射电子显微镜 (TEM) 分析和 X 射线衍射 (XRD) 测量表明合成的纳米 Cu ₂ O-Cu/藻酸盐主要由 Cu ₂ O-Cu 组成，以 Cu ₂ O@Cu 核的形式存在 –对于 60、80 和 100 mM 的铜离子初始浓度，壳结构的粒径分别为 4.2、5.3 和 8.4 nm。得到的纳米Cu ₂O-Cu/藻酸盐对米黄单胞菌pv.表现出高抗菌活性。水稻（黄单胞菌 OO）。结果表明，含有30 mg.l ^-1铜离子的纳米Cu ₂ O-Cu/藻酸盐完全抑制了黄单胞菌OO细菌的生长，该细菌是造成水稻叶枯病的原因。纳米Cu ₂ O-Cu/藻酸盐材料可作为杀菌剂替代有毒的农用化学品，并有可能应用于可持续农业生产的发展。