Protein-sheathed SWNT as a versatile scaffold for nanoparticle assembly and superstructured nanowires

• 来源期刊: 中国科学:化学（英文版）
• 年，卷（期）: 2018,（9）
• 页码范围: 1128-1133
• 页数: 6页
• 语种: 英文

摘要

One dimensional (1 D) nanostructures have many possible applications in electronic,optical,and sensing devices associated with their nanosized lateral dimensions.In this regard,a general and bottom-up strategy to synthesize 1D nanoparticle arrays and conductive nanowires with a facile structural/compositional control is highly desired.We herein report a protein-sheathed single walled carbon nanotube (SWNT) that satisfies the criteria for an ideal template to assemble micron-long gold nanoparticle (AuNP) linear arrays with high structural rigidity.The resulting AuNP array has minimized inter-particle gaps,which is especially useful to template the overgrowth of Ag,Pd,and Pd/Ag metals into continuous nanowires (Au@M,M=Ag,Pd,Ag/Pd).Our method successfully overcomes the incompatibility between carbon and metal materials,and the resulting superstructured metal nanowires have a tunable diameter below 100 nm and a shape closely replicating a SWNT.The Ag nanowires are composed of coalesced Au@Ag coreshell nanoparticles,while the Pd and Pd/Ag nanowires are made of very fine Pd nanocrystallites around the AuNP cores.These unique structural features are pivotal to various applications including surface enhanced Raman scattering (SERS),electrocatalysis,and gas sensors.