Segmented metal–metal heterostructure nanorods/nanowires are very promising for development in photoelectric devices, wearable electronics, biomedicine, and energy storage due to unique surface and interface and adjustable electronic and optical properties. Regretfully, most of the segmented heterojunctions are presently synthesized in organic solvent, and its electronic dynamics is still rarely studied and poorly understood. Here, we reported a pressure-assisted one-step aqueous-phase strategy to successfully synthesize segmented Ag–Au–Ag heterojunction nanorods (HJNRs), the aspect ratios and heterojunction contents of which can be well controlled by varying pressure value. The heterojunction-induced femtosecond-to-nanosecond dynamics in 1D direction of the Ag–Au–Ag HJNRs were for the first time acquired and presented a unique regularity tendency (e.g., electron–phonon scattering time). The unprecedented aqueous-phase strategy opens up horizons of synthesis of other segmented metal–metal HJNRs, and the fascinating Ag–Au–Ag HJNRs are hopeful for the development of a new class devices in photothermal and photoelectronic fields.

中文翻译：

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分段的Ag-Au-Ag异质结纳米棒：压力辅助水相合成和飞秒至纳秒级动力学设计

分段金属-金属异质结构纳米棒/纳米线因其独特的表面和界面以及可调节的电子和光学特性，在光电设备，可穿戴电子设备，生物医学和能量存储领域的发展非常有希望。遗憾的是，目前大多数分段的异质结是在有机溶剂中合成的，其电子动力学仍然很少研究并且了解甚少。在这里，我们报道了一种压力辅助的一步水相策略，可以成功地合成分段的Ag–Au–Ag异质结纳米棒（HJNR），可以通过改变压力值很好地控制其长宽比和异质结含量。Ag-Au-Ag HJNRs在一维方向上由异质结引起的飞秒到纳秒动力学是首次获得，并表现出独特的规律性趋势（例如，电子-声子散射时间）。前所未有的水相策略为其他分段金属-金属HJNR的合成开辟了前景，引人入胜的Ag-Au-Ag HJNRs有望为光热和光电子领域中新型器件的开发带来希望。