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

作　　者：Jinjing Wu Yang Yang Zhaoxiang Deng 

机构地区：[1]Department of Chemistry, University of Science and Technology of China

出　　处：《Science China Chemistry》2018年第9期1128-1133,共6页中国科学（化学英文版）

基　　金：supported by the National Science Fund for Distinguished Young Scholars (21425521);the National Natural Science Foundation of China (21521001);the National Key Research and Development Program of China (2016YFA0201300);the Collaborative Innovation Center of Suzhou Nano Science and Technology

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 1 D 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(Au NP) linear arrays with high structural rigidity. The resulting Au NP 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 Au NP cores. These unique structural features are pivotal to various applications including surface enhanced Raman scattering(SERS), electrocatalysis, and gas sensors.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 1 D 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（Au NP） linear arrays with high structural rigidity. The resulting Au NP 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 Au NP cores. These unique structural features are pivotal to various applications including surface enhanced Raman scattering（SERS）, electrocatalysis, and gas sensors.

关 键 词：SWNT protein nanoparticle self-assembly NANOWIRE 

分 类 号：TB383.1[一般工业技术—材料科学与工程]