. By introducing
ammonium chloride as electrolyte and varying the volume ratios of hydrazine hydrate to ethylenediamine,
shape evolution of hexagonal NiSe crystals from small hexagonal microdisks to hexagonal
microdisks in larger width, microspheres, hexagonal prisms and hexagonal bitowers is successfully
achieved. X-ray powder diffraction, field emission scanning electron microscopy, energy dispersion
spectrometer, transmission electron microscopy and selected area electron diffraction are performed
for the analyses of the products.