Figure 7 | Scientific Reports

Figure 7

From: Fe(NO3)3-assisted large-scale synthesis of Si3N4 nanobelts from quartz and graphite by carbothermal reduction–nitridation and their photoluminescence properties

Figure 7

Proposed growth model of Si3N4 nanobelt.

Normal topical Si3N4 nanobelt: (a) Fe droplet left on the surfaces of graphite felt substrate. (b) Fe reacted with both SiO and N2 to form Fe-Si-N eutectic liquid droplets and triangular tip of Si3N4 nanobelt began to show up. (c) Continual SiO and N2 were transported to the reaction site to form the Si3N4 along the growth direction. Si3N4 nanobelt with straight trail: (d) Fe droplet with a patch of solid refractory. (e) Nanobelt grew from Fe-Si-N eutectic droplets but it was hindered at a certain growth point by the solid refractory. (f) The Si3N4 nanobelt with straight trail continued to grow (the inset is the vertical sketch).

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