About Some Fundamental Aspects of the Growth Mechanism Vapor-Liquid-Solid Nanowires

Figure 14

Scheme of NW growth without the formation of a cone-shaped base (a) and SEM images of Si NWs grown on a Si (111) substrate with an Au catalyst and different morphologies [24] (b) without a cone-shaped base with a constant diameter, (c) with a cone-shaped pedestal at the base and a diameter increasing towards the apex, and (d) with a straight base and a diameter decreasing in height. Droplets (b) and (d) continuously received additional Au, which compensated for the narrowing of the stem at the base. Scale 100 nm.