“…[22][23][24][25][26][27] Thanks to research efforts contributed by many groups, several synthetic approaches have been proposed and validated for the fabrication of metallic nanowires with reasonable yields (e.g., template assisted in-plane growth of nanowires, and electric eld assisted growth of nanowires, among others). [28][29][30][31] Compared to physical routes, wet-chemical synthesis exhibited tremendous advantages, such as being template-free, low cost, easy to scale up, and having mild reaction conditions, among others. [32][33][34][35][36][37][38][39] Take silver for example: as a pioneer in this eld, Xia and coworkers demonstrated that high-quality Ag nanowires could be obtained by dropwisely adding ethylene glycol solutions of AgNO 3 and poly(vinylpyrrolidone) (PVP) at an elevated temperature.…”