Interfacial Engineering of Dual‐Layer Au‐Shelled Ag Nanowires: Decoupling Chemical Stability From Ultrasensitive Surface‐Enhanced Raman Spectroscopy Activity
One‐dimensional (1D) silver nanowires are promising surface‐enhanced Raman spectroscopy (SERS) substrates, yet their plasmonic hotspots are spatially confined to sharp tips or junctions, leaving the extensive body optically inactive. Additionally, realizing high‐performance Ag‐based substrates faces a fundamental trade...