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One method that is used to grow nanowires nanotubes with solid cores is to initially deposit a small droplet of a liquid catalyst onto a flat surface The surface and catalyst are heated and

One method that is used to grow nanowires (nanotubes with solid cores) is to initially deposit a small droplet of a liquid catalyst onto a flat surface. The surface and catalyst are heated and simultaneously exposed to a higher-temperature, low-pressure gas that contains a mixture of chemical species from which the nanowire is to be formed. The catalytic liquid slowly absorbs the species from the gas through its top surface and converts these to a solid material that is deposited onto the underlying liquid-solid interface, resulting in construction of the nanowire. The liquid catalyst remains suspended at the tip of the nanowire. Consider the growth of a 15-nm-diameter silicon carbide nanowire onto a silicon carbide surface. The surface is maintained at a temperature of Ts = 2400 K, and the particular liquid catalyst that is used must be maintained in the range 2400 K ≤ Tc ≤  3000 K to perform its function. Determine the maximum length of a nanowire that may be grown for conditions characterized by h = 105 W/m∙ K and T - 8000 K. Assume properties of the nanowire are the same as for bulk silicon carbide.

 

 

 

 

Jun 28 2020 View more View Less

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