796815.fig.004a
(a)
796815.fig.004b
(b)
796815.fig.004c
(c)
796815.fig.004d
(d)
Figure 4: Growth control of the product morphology. SEM images of the products at different experiment parameters. (a-b) without the addition of sulfur powder, (c-d) the addition of ammonia water instead of sulfur powders.