Bimetallic nanoparticles (BNPs) have drawn significant attention due to their numerous applications. They demonstrate enhanced optical, electrical, thermal, and catalytic properties due to the synergistic effects of monometals present in them. In this work, CuAg and AuAg BNPs have been synthesized using a facile and economical chemical reduction method. Optical characterization was carried out using UV–visible spectroscopy, and effect of pH on optical absorbance was studied. For CuAg and AuAg BNPs, optimum pH was observed to be at 9.4 and 6.39, respectively. Morphological investigation confirms the average diameters of CuAg and AuAg BNPs were to be 65 nm and 30 nm, respectively. Photocatalytic property illustrates the reduction of 4-nitrophenol to 4-aminophenol with a 92% conversion percentage in the presence of CuAg BNPs in 4 min, and rate constant for the reaction was measured to be 8.98 × 10^–3 s⁻¹. But for the AuAg BNPs, the conversion percentage was 97% in 8 min and rate constant was found to be 7.95 × 10^–3 s⁻¹. Thermal conductivity and viscosity measurements of the nanofluids obtained with CuAg and AuAg BNPs have ascertained them to be efficient candidates for the heat transfer and catalytic applications.

Graphic abstract

中文翻译：

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用于催化和传热应用的 CuAg 和 AuAg 双金属纳米粒子

双金属纳米粒子（BNPs）因其众多的应用而引起了人们的极大关注。由于存在于其中的单金属的协同作用，它们表现出增强的光学、电学、热学和催化性能。在这项工作中，CuAg 和 AuAg BNP 已使用简便且经济的化学还原方法合成。使用紫外-可见光谱进行光学表征，并研究了 pH 值对吸光度的影响。对于 CuAg 和 AuAg BNP，观察到的最佳 pH 值分别为 9.4 和 6.39。形态学研究证实，CuAg 和 AuAg BNP 的平均直径分别为 65 nm 和 30 nm。光催化性能表明，在 CuAg BNP 存在下，4 分钟内 4-硝基苯酚以 92% 的转化率还原为 4-氨基苯酚，^–3 秒^-1。但是对于 AuAg BNP，8 分钟内的转化率为 97%，速率常数为 7.95 × 10 ^–3  s ^-1。用 CuAg 和 AuAg BNP 获得的纳米流体的热导率和粘度测量已确定它们是传热和催化应用的有效候选者。

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