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Synthesis and applications of one dimensional (1D) metal nanostructures have attracted much attention. However, one-step synthesis of bimetallic nanowires (NWs) has remained challenging. In this work, we developed a microorganism-mediated, hexadecyltrimethylammonium bromide (CTAB)-directed (MCD) approach to synthesize closely packed and long Au-Ag NWs with the assistance of a continuous injection pump. Characterization results confirmed that the branched Au-Ag alloy NWs was polycrystalline. And the Au-Ag NWs exhibited a strong absorbance at around 1950 nm in the near-infrared (NIR) region, which can find potential application in NIR absorption. In addition, the Au-Ag NWs showed excellent surface-enhanced Raman scattering (SERS) enhancement when 4-mercaptobenzoic acid (MBA) and rhodamine 6G (R6G) were used as probe molecules.

• With the decrease of length, NW samples become stronger except the sample with 4 nm length and force on Ag end. • NWs with load on Ag end outperform the same NWs with load on Au end in terms of yield stress and elongation. • The analysis from the radial distribution functions of the Ag segment of NWs is used to explain above phenomenon The tensile process of nanowires (NWs), in which one end of a NW is fixed, and the load is applied to the other end, is investigated via molecular dynamics (MD). Here, we pay attention to length-dependent mechanical properties of heterostructured Au-Ag NWs under the above tensile form. It was discovered that all the samples became stronger except for the shortest one with the length of 4 nm and the load on the Ag end with the decrease of length. Meanwhile, we found that all samples with the load on Ag ends outperformed the same NWs with the load on Au ends in terms of yield strengths and elongations. Meanwhile, the NWs with the load on Ag ends may exhibit a better performance in terms of conductivity. A reasonable analysis from the perspective of radial distribution function has been developed to explain above phenomena. [ABSTRACT FROM AUTHOR]

Synthesis and applications of one dimensional (1D) metal nanostructures have attracted much attention. However, one-step synthesis of bimetallic nanowires (NWs) has remained challenging. In this work, we developed a microorganism-mediated, hexadecyltrimethylammonium bromide (CTAB)-directed (MCD) approach to synthesize closely packed and long Au-Ag NWs with the assistance of a continuous injection pump. Characterization results confirmed that the branched Au-Ag alloy NWs was polycrystalline. And the Au-Ag NWs exhibited a strong absorbance at around 1950 nm in the near-infrared (NIR) region, which can find potential application in NIR absorption. In addition, the Au-Ag NWs showed excellent surface-enhanced Raman scattering (SERS) enhancement when 4-mercaptobenzoic acid (MBA) and rhodamine 6G (R6G) were used as probe molecules. [ABSTRACT FROM AUTHOR]