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\subsection{VLS methods}  One of the most common synthesis methods used to create nanowires is VLS synthesis, a method that is proven to be both simple and efficient in not only the growth of singular nanowires, but also large arrays of nanowires.\cite{Suo_2014} VLS depends on a unique chemical reaction between the two feed gases that introduce gallium and nitrogen (usually ammonia) into the reaction chamber. At the same time, an nonreactive carrier gas, such as nitrogen or argon,and a small amount of hydrogen gas,  is pumped into the reaction chamber. chamber along with a small amount of hydrogen gas.  Once at a nucleation point designated by a metal powder catalyst, the gallium-containing vapor forms a liquid layer of gallium and partially oxidizes into Ga2O3. The equilibrium between liquid gallium and Ga2O3 is controlled by the presence of the hydrogen gas, as it is able to reduce the Ga2O3 back into liquid gallium. At the same time, the liquid gallium layer also cracks the ammonia gas to produce more hydrogen, which allows the nitrogen to react with the liquid gallium and form GaN nanowires.\cite{Chen_2000} In 2000, Chen et al. report a method they utilized to create a large mass of nanowires by using an iridium powder catalyst to accelerate the reaction between gallium and ammonia gas. A liquid droplet containing iridium, gallium, and nitrogen served as the nucleation point for the nanowires. These sites were produced while the reaction chamber was heated, and the nanowires grew outwards as the liquid droplet remained on top of the nanowire itself. Although initially growing independently from one another, the nanowires became entangled into a large mesh as they grew longer.