Chemically initiated liquid-like behavior and fabrication of periodic wavy Cu/CuAu nanocables with enhanced catalytic properties
Chemically initiated liquid-like behavior and fabrication of periodic wavy Cu/CuAu nanocables with enhanced catalytic properties
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化学引发的类液体行为以及具有增强催化性能的周期性波状 Cu/CuAu 纳米电缆的制造
DOI：
10.1039/c8nr01174e
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发表时间：
2018
期刊：
影响因子：
6.7
通讯作者：
Xie Zhaoxiong
中科院分区：
文献类型：
--
作者：
Jiang Zhiyuan;Jiang Qiaorong;Huang Rao;Sun Mingjun;Wang Kaili;Kuang Qin;Zhu Zi-Zhong;Xie Zhaoxiong
固体晶体材料的原子排列有长程顺序，而液体的原子排列有短程顺序，它们之间的转变通常是由热和/或压力引起的。在此，我们报告了这一发现，化学过程可能起着与热类似的作用，并在远低于其熔点的温度下引发晶体纳米材料的类液体行为。当直晶Cu/CuAu纳米电缆在室温条件下分散于80℃的有机胺中时，表面Cu原子的连续氧化和Cu原子从核心向表面的扩散会破坏原子的远距离有序排列，导致各向异性晶体转变为各向同性的类液体状态。这导致纳米电缆在瑞利不稳定性之后由直线形态演变为周期性波浪结构。在NaBH4催化对硝基苯酚还原为对氨基苯酚的过程中，周期波状Cu@CuAu纳米线的催化活性明显优于直线状Cu@CuAu纳米线。我们的研究结果不仅提供了在纳米尺度上固体晶体和类液体状态之间转变的新见解，而且还促进了合成功能纳米材料的新策略的发展。
Solid crystalline materials have long range order in their atomic arrangement while liquids have short range order, and the transition between them is usually caused by heat and/or pressure. Herein, we report the finding that chemical processes may play a similar role as heat and initiate liquid-like behavior of crystalline nanomaterials at a temperature far below their melting points. When the straight Cu/CuAu crystalline nanocables are dispersed in organic amine at 80 °C under ambient conditions, the continuous oxidation of Cu atoms on the surface and diffusion of Cu atoms from the core to the surface would break up the long-range ordered arrangement of atoms and lead to the transformation of an anisotropic crystal into an isotropic liquid-like state, which resulted in the evolution of the straight morphology of the nanocables into periodic wavy structures following the Rayleigh instability. It was also demonstrated that periodic wavy Cu@CuAu nanocables exhibit much better catalytic activity than straight Cu@CuAu nanocables towards the reduction of p-nitrophenol into p-aminophenol by NaBH4. Our results not only provide new insights into the transition between a solid crystal and a liquid-like state at the nanoscale, but also facilitate the development of new strategies for the synthesis of functional nanomaterials.