NBD high temperature tube furnace is widely used in vapor–liquid–solid method (VLS) in laboratory of university and research institutions. In order to meet requirements of vapor–liquid–solid method (VLS). NBD developed single zone tube furnace, dual zone tube furnace, three zone tube furnace. NBD also can design tube furnace according to user’s special experiment process.
The vapor–liquid–solid method (VLS) is a mechanism for the growth of one-dimensional structures, such as nanowires, from chemical vapor deposition. The growth of a crystal through direct adsorption of a gas phase on to a solid surface is generally very slow. The VLS mechanism circumvents this by introducing a catalytic liquid alloy phase which can rapidly adsorb a vapor to supersaturation levels, and from which crystal growth can subsequently occur from nucleated seeds
at the liquid–solid interface. The physical characteristics of
nanowires grown in this manner depend, in a controllable way, upon the
size and physical properties of the liquid alloy.
The VLS mechanism is typically described in three stages:
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Preparation of a liquid alloy droplet upon the substrate from which a wire is to be grown.
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Introduction of the substance to be grown as a vapor, which adsorbs on to the liquid surface, and diffuses into the droplet.
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Supersaturation and nucleation at the liquid/solid interface leading to axial crystal growth.
VLS via Single Zone Tube Furnace
VLS via dual Zone Tube Furnace
