In this work, we experimentally demonstrate the synthesis of different bimetallic Ag–Cu nanostructures like core–shell, Janus particles. It is shown that different nanoparticle structures are associated with different reaction pathways. The pathway is manipulated by modifying the operating conditions (reactant sequence in this case) of the reactions. Ascorbic acid and cetyltrimethylammonium bromide (CTAB) is used as the reducing agent and the capping agent, respectively. Silver nitrate and copper nitrate are used as precursors. The reaction is carried out under microwave-assisted heating, which intensifies metal ion reduction. Two protocols are studied: (I) sequential and (II) simultaneous addition of precursors. By changing the sequence of the precursor addition, the morphology of the bimetallic nanoparticles was altered. Janus particles of size 25–30 nm were formed under the simultaneous addition and the sequential addition when the silver precursor is added first, followed by the copper precursor. When the sequence of precursor addition was reversed, i.e., copper precursor followed by silver, Cu core-Ag shell particles of size 65 nm were formed. We propose mechanisms that help understand the formation of these different structures. Resistance to oxidation studies showed that the particles with Cu core-Ag shell morphology were more resistant to oxidation than Janus particles.

在这项工作中，我们通过实验证明了不同双金属 Ag-Cu 纳米结构的合成，如核-壳、Janus 粒子。结果表明，不同的纳米颗粒结构与不同的反应途径有关。通过修改反应的操作条件（在这种情况下为反应物顺序）来操纵该途径。抗坏血酸和十六烷基三甲基溴化铵 (CTAB) 分别用作还原剂和封端剂。硝酸银和硝酸铜用作前体。该反应在微波辅助加热下进行，从而加强了金属离子的还原。研究了两种协议：（I）顺序和（II）同时添加前体。通过改变前体添加的顺序，双金属纳米粒子的形态发生了变化。当首先添加银前体，然后添加铜前体时，在同时添加和顺序添加下形成尺寸为 25-30 nm 的 Janus 颗粒。当前体添加顺序颠倒时，即铜前体后银，形成尺寸为65nm的Cu核-Ag壳颗粒。我们提出了有助于理解这些不同结构形成的机制。抗氧化性研究表明，具有 Cu 核-Ag 壳形态的颗粒比 Janus 颗粒更抗氧化。形成尺寸为65nm的Cu核-Ag壳颗粒。我们提出了有助于理解这些不同结构形成的机制。抗氧化性研究表明，具有 Cu 核-Ag 壳形态的颗粒比 Janus 颗粒更抗氧化。形成尺寸为65nm的Cu核-Ag壳颗粒。我们提出了有助于理解这些不同结构形成的机制。抗氧化性研究表明，具有 Cu 核-Ag 壳形态的颗粒比 Janus 颗粒更抗氧化。