@article{Zhu2021, 
author = {Yangzhi Zhu and Sanggon Kim and Xuezhi Ma and Peter Byrley and Ning Yu and Qiushi Liu and Xiaoming Sun and Da Xu and Sangshan Peng and Martin C. Hartel and Shiming Zhang and Vadim Jucaud and Mehmet R. Dokmeci and Ali Khademhosseini and Ruoxue Yan},
title = {Ultrathin-shell epitaxial Ag@Au core-shell nanowires for high-performance and chemically-stable electronic, optical, and mechanical devices},
year = {2021},
journal = {Nano Research},
volume = {14},
number = {11},
pages = {4294-4303},
keywords = {epitaxial growth, core-shell nanowire, plasmonic waveguides, atomic force microscopy (AFM) probe, transparent electrode, wearable electronics},
url = {https://www.sciopen.com/article/10.1007/s12274-021-3718-z},
doi = {10.1007/s12274-021-3718-z},
abstract = {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 ℃ 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.}
}