2.3.7. Particle morphology
Particle morphology was evaluated by field emission scanning
electron microscopy (FE-SEM) according to Mishra et al. (2014) and
slight modifications. The powder were mounted onto stubs with
double-sided adhesive tape, and the samples were coated with a
thin layer of gold under vacuum. Then, the samples were examined
on an FE scanning electron microscope (SU8020, HITACHI, Japan) at
5 kV and 5000-fold magnification. The taking microphotographs was carried out with a camera coupled to the microscopic (Cano-Chauca et al., 2005).