Abstract
We describe a straightforward technique to synthesize pure Mo nanowires (NWs) from Mo6SyIz (8,2 <y + z ≤ 10) NWs as precursor templates. The structural transformations occur when Mo6SyIz NWs are annealed in Ar/H2 mixture leading to the formation of pure Mo NWs with similar structures as initial morphologies. Detailed microscopic characterizations show that large diameters (>15 nm) Mo NWs are highly porous, while small diameters (<7 nm) are made of solid nanocrystalline grains. We find NW of diameter 4 nm can carry up to 30 μA current without suffering structural degradation. Moreover, NWs can be elastically deformed over several cycles without signs of plastic deformation.
Highlights
Synthesis and characterization of nanostructured materials have been a major area of research activities in the last two decades
Typical SEM images of three different morphologies of the as-synthesized Mo6SyIz (8,2 < y + z ≤ 10) NWs are shown in the left panel of Figure 2
The images show that the general morphology is not altered after the hydrogenation process; significant pore formation is already visible, especially for the large diameter NWs
Summary
Synthesis and characterization of nanostructured materials have been a major area of research activities in the last two decades. Nanowires (NWs), nanorods, and nanobelts constitute an important class of 1D nanostructures which provide models to study the relationship between electrical transport, optical, and other properties with dimensionality and size confinements. Investigation of these nanomaterials has attracted much attention due to their wide range of potential applications in areas such as nanoscale circuitry linkages, field electron emitters, nanosensors, and magnetic devices [1]. An important and promising method for preparing 1D nanomaterials is by using existing 1D nanostructures as templates via reactions such as metal to oxide with O2, oxide to metal with H2 [2], metal or oxide to sulfide with H2S, carbon nanotubes to carbide with a vapor of metal oxide or halide [3], and copper oxide to copper [4]. There are several ways in which Mo NWs have been grown
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