Thermal stable, one-dimensional hexagonal-phase vanadium sulfide nanowires and methods for preparing the same
AssigneeCity University of Hong Kong
InventorsHua Zhang, Yi Ren
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Abstract
The present invention provides a general salt-assisted chemical vapor deposition (SA-CVD) synthetic method for the high-yield preparation of 1D hexagonal-phase MxV6S8(M=K, Rb, Cs) and KxV6SySe8-y nanowires. The resulting nanowires exhibit typical metallic properties, which can be used as a good van der Waals contact for achieving high-performance fermi level pinning free transistors. The present synthesis method allows a more systematic investigation of the intrinsic properties of hexagonal-phase V6S8 structures.
Claims18
A thermal stable, one dimensional hexagonal-phase MxVySz nanowire, wherein
- M=K, Rb, Cs;
- x=0.2 or 1.12;
- y=6;
- z=8,
- wherein the thermal stable, one dimensional hexagonal-phase MxVySz nanowire, has c-axis-aligned hexagonal channels, and wherein the thermal stable, one dimensional hexagonal-phase MxVySz nanowire exhibits an unchanged Raman spectrum in a temperature range of 30 to 300° C.
A thermal stable, one dimensional hexagonal-phase KxV6SySes8-y nanowire, wherein
- x=0.68 or 1.34;
- y=7.02 or 6.79,
- wherein the thermal stable, one dimensional hexagonal-phase MxVySz nanowire has c-axis-aligned hexagonal channels, and wherein the thermal stable, one dimensional hexagonal-phase KxV6SySe8-y nanowire exhibits an unchanged Raman spectrum in a temperature range of 30 to 300° C.
A salt-assisted method for synthesizing one-dimensional hexagonal-phase vanadium sulfide nanowires on a substrate, comprising the steps of:
- preparing a substrate;
- providing a precursor by mixing vanadium (V) and sulfur(S) compounds;
- introducing a metal salt to the precursor via a chemical vapor deposition (SA-CVD) method to obtained a mixture;
- transferring the mixture to a quartz boat and covering two pieces of fresh-cleaved fluorophlogopite mica substrates on top of loaded mixture;
- transferring the quartz boat to the center of a quartz tube, and then introducing Ar and H2 to provide an optimal synthesis atmosphere;
- heating the quartz tube and then cooling the quartz boat down to room temperature;
- and
- growing the one dimensional hexagonal-phase MxV6S8 nanowires and KxV6SyS8-y nanowires on the substrate.
Dependencies are inferred from the claim text.