AuAg Nanosheets\nAssembled from Ultrathin AuAg Nanowires

Abstract

Assembly\nof noble metal nanocrystals into free-standing two-dimensional\n(2D) nanostructures with a regular shape is still a challenge. Here\nwe report the preparation of a novel 2D AuAg nanosheet with length\nof 1.50 ± 0.30 μm, width of 510 ± 160 nm, and thickness\nof ∼100 nm via the assembly of ultrathin AuAg nanowires in\nthe presence of the triblock copolymer Pluronic P123. The self-assembly\nof P123 and the fusion behavior of the nanowires during the assembly\nprocess are the key reasons for the formation of AuAg nanosheets in\nP123. Furthermore, the obtained AuAg nanosheet@​P123 is used\nas the active material in a memory device that exhibits the write-once-read-many-times\nmemory behavior.