The combination of gold and copper is a good way to pull down the cost of gold and ameliorate the instability of copper. Through shape control, the synergy of these two metals can be better exploited. Here, we report an aqueous phase route to the synthesis of pentacle gold-copper alloy nanocrystals with fivefold twinning, the size of which can be tuned in the range from 45 to 200 nm. The growth is found to start from a decahedral core, followed by protrusion of branches along twinning planes. Pentacle products display strong localized surface plasmon resonance peaks in the near-infrared region. Under irradiation by an 808-nm laser, 70-nm pentacle nanocrystals exhibit a notable photothermal effect to kill 4T1 murine breast tumours established on BALB/c mice. In addition, 70-nm pentacle nanocrystals show better catalytic activity than conventional citrate-coated 5-nm Au nanoparticles towards the reduction of p-nitrophenol to p-aminophenol by sodium borohydride.

中文翻译：

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五角形金铜合金纳米晶体的简便合成及其等离子体和催化性能。

金铜结合是拉低金价、改善铜价不稳定性的好方法。通过形状控制，可以更好地发挥这两种金属的协同作用。在这里，我们报告了一种合成五重孪晶金铜合金纳米晶体的水相途径，其尺寸可以在 45 到 200 nm 的范围内调节。发现生长从十面体核心开始，然后沿着孪生平面突出分支。Pentacle 产品在近红外区域显示出强烈的局部表面等离子体共振峰。在 808 nm 激光照射下，70 nm 五角形纳米晶体表现出显着的光热效应，可杀死在 BALB/c 小鼠上建立的 4T1 鼠乳腺肿瘤。此外，