Ultrathin-shell epitaxial Ag@Au core-shell nanowires for high-performance and chemically-stable electronic, optical, and mechanical devices
Ultrathin-shell epitaxial Ag@Au core-shell nanowires for high-performance and chemically-stable electronic, optical, and mechanical devices
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DOI：
10.1007/s12274-021-3718-z
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发表时间：
2021-08-07
期刊：
影响因子：
9.9
通讯作者：
Yan, Ruoxue
中科院分区：
文献类型：
--
作者：
Zhu, Yangzhi;Kim, Sanggon;Yan, Ruoxue
银纳米线 (AgNW) 由于其独特的等离子体、机械和电子特性，在可穿戴电子产品、柔性太阳能电池、化学和生物传感器、光子/等离子体电路和扫描探针显微镜 (SPM) 中具有广阔的应用前景。然而，基于AgNW的器件的寿命、可靠性和工作条件因其化学稳定性差而受到严重限制，从而限制了其商业潜力。因此，在银纳米线上创建可靠的氧化屏障至关重要，为各种光学、电气和机械设备提供长期化学稳定性，同时保持其高性能。在这里，我们报告了一种在 AgNW 上生长超薄外延金涂层的室温溶液相方法，以有效保护 Ag 表面免受环境氧化。 Ag@Au核壳纳米线（Ag@Au NWs）在空气中保持稳定超过六个月，在升高的温度和湿度（80摄氏度和100％湿度）下保持稳定十二周，在生理缓冲溶液中保持三周，并且可以在氧化溶液（2％H2O2）的过夜处理中保持稳定。 Ag@Au核壳纳米线在各种电子、光学和机械设备中表现出与原始AgNW相当的性能，例如透明网状电极、表面增强拉曼光谱（SERS）基板、等离子体波导、等离子体纳米聚焦探针和高纵横比、高分辨率原子力显微镜（AFM）探针。这些 Au@Ag 核壳纳米线为化学稳定的基于 AgNW 的器件提供了通用解决方案，且不影响材料特性或器件性能。
Silver nanowires (AgNWs) hold great promise for applications in wearable electronics, flexible solar cells, chemical and biological sensors, photonic/plasmonic circuits, and scanning probe microscopy (SPM) due to their unique plasmonic, mechanical, and electronic properties. However, the lifetime, reliability, and operating conditions of AgNW-based devices are significantly restricted by their poor chemical stability, limiting their commercial potentials. Therefore, it is crucial to create a reliable oxidation barrier on AgNWs that provides long-term chemical stability to various optical, electrical, and mechanical devices while maintaining their high performance. Here we report a room-temperature solution-phase approach to grow an ultra-thin, epitaxial gold coating on AgNWs to effectively shield the Ag surface from environmental oxidation. The Ag@Au core-shell nanowires (Ag@Au NWs) remain stable in air for over six months, under elevated temperature and humidity (80 degrees C and 100% humidity) for twelve weeks, in physiological buffer solutions for three weeks, and can survive overnight treatment of an oxidative solution (2% H2O2). The Ag@Au core-shell NWs demonstrated comparable performance as pristine AgNWs in various electronic, optical, and mechanical devices, such as transparent mesh electrodes, surface-enhanced Raman spectroscopy (SERS) substrates, plasmonic waveguides, plasmonic nanofocusing probes, and high-aspect-ratio, high-resolution atomic force microscopy (AFM) probes. These Au@Ag core-shell NWs offer a universal solution towards chemically-stable AgNW-based devices without compromising material property or device performance.