Preparation and Growth Mechanism of Chrysanthemum-Like ZnO Nanowire Clusters

Abstract

With sodium hydroxide (NaOH), ammonia water (NH3 x H2O) and hexamethylenetetramine (HMT, C6H12N4) respectively as alkaline source material, a simple hydrothermal process was employed to prepare chrysanthemum-like ZnO nanowire clusters. The morphologies and crystalline structures of the as-prepared products were investigated by X-ray diffractometer (XRD), field emission environment scanning electron microscope (SEM), and high-resolution transmission electron microscopy (TEM). The experimental results indicate that the as-prepared products all have three-dimensional chrysanthemum-like structure in which the petal-like nanowires are ZnO single crystalline with hexagonal wurtzite structure, that the flower bud saturation degree F(d) is slightly different under different alkaline source materials, and that the proposed growth mechanism of chrysanthemum-like ZnO nanowire clusters is reasonable.

Hydrothermal synthesis and infrared emissivity property of flower-like SnO2 particles

“…3), and these nuclei may reunite to form the multi-twin central nuclei 19 under the synergistic interaction from Van der waals force, Coulomb force and cohesive driving force related to the alkali-salt ratio and absolute [OH − ]. When the value of alkali-salt ratio is 6:1, few excessive OH − ions is in hydrothermal system on basis of Fig.…”

“…However, the morphological indexes of sample 3 and 4, i.e. the slenderness ratio L d and the flower bud saturation degree F d , 19 Above all, the PAM is ionized to become the positive hydrophilic group (-CONH 2 ) and negative…”