Spatially Sequential Growth of Various WSi₂ Networked Nanostructures and Mechanisms

Abstract

Various WSi 2 nanostructures including networked nanorods (NNWs), networked nanoribbons (NNRs), and nanosheets (NSs) were sequentially (spatial) synthesized in a controlled manner via a single-step chemical vapor deposition method. Their morphology, structure, and composition were characterized by scanning and transmission electron microscopes and X-ray diffraction. The nanostructures are 6−10 nm in thickness and several micrometers in length. The results reveal that the formation of WSi 2 nanostructures is governed by a vapor solid mechanism and the concentration of reactive species plays a crucial role in controlling the formation of the various morphologies of the synthesized nanostructures. The time-dependent growth study shows that the nanostructures feature two-dimensional growth of WSi 2 , resulting in nanonets and nanosheets. Cyclic voltammetry measurements of these nanostructures demonstrate the chemical capacitance characteristics of WSi 2 nanosheets and nanoribbons. Not only has this study paved a new route for preparing various nanostructures, but also these nanostructures are of great interest for nanodevices and electrochemical applications.

Structural Changes in Tungsten and Tantalum Wires in Catalytic Chemical Vapor Deposition Using 1,3-Disilacyclobutane

“…23 Similarly, metal silicides have attracted applications in microelectronics and electrochemical nanodevices. [24][25][26] Hence, what was once considered the "filament aging" process could be utilized to fabricate useful crystalline materials.…”

“…Tungsten monocarbide (WC) has found many industrial applications as heterogeneous catalysts , and promising anode materials for direct methanol fuel cell (DMFC) . Similarly, metal silicides have attracted applications in microelectronics and electrochemical nanodevices. − Hence, what was once considered the “filament aging” process could be utilized to fabricate useful crystalline materials.…”

Ballistic Deposition of Nanoclusters

“…Other applications of nanostructures, using Tungsten Silicides, show promise for use in super capacitors. 3 . Another application is in thermoelectric materials.…”