  Flower-like nanostructures formed by ZnO nanorods were synthesized and
deposited on seeded silicon and glass substrates by a hexamethylenetetramine
(HMTA) - assisted hydrothermal method at low temperature (90 oC) with
methenamine ((CH3)6N4), as surfactant and catalyst. The substrates were seeded
with ZnO nanoparticles. The structure and morphology of the nanostructures were
studied by means of x-ray diffraction (XRD), high resolution transmission
electron microscopy (HRTEM), and scanning electron microscopy (SEM) techniques.
Influence of the seed nanoparticle on the formation of the flower-like ZnO
nanostructures is demonstrated. The influence of the organic oxygenated chains
on the crystalline habit during the growth process is also observed.
