Table 2.

Qualitative summary for the observed shapes based on the SEM images from the NH₄CN polymers synthetized at 170 °C (please see the images collected in the supplementary information). – = not detected; + = detected but very minority and poorly representative; ++ and +++ = observed; ++++ = main shape observed.

Reaction Time (min)
Shape of Particles	5	18	36	52	58	67	72	90	105	120
Long isolated nanofibers	+	+	+	+	+	+++	+	+	+	+
Short nanofibers networks	−	−	++++	++++	−	−	−	−	−	−
Spherical/oval nanoparticles	+++	++	−	++	+	−	++	+++	+	++
Irregular and planar stacking	++	−	+	−	−	+	−	−	−
Rice-shape like nanoparticles	+++	+++	+	−	++++	++++	+++	+++	++++	++++