  Successive ionic layer adsorption and reaction (SILAR) method is based on the
adsorption and reaction of the ions in the cationic solution and the ionic
solution, respectively. This method is simple, inexpensive, large-scale
deposition, effective way for deposition on 3D substrates, low-temperature
process and represents an easy way for the preparation of doped, composite and
heterojunction materials. To take advantage of this method and the ZnO
nanostructures, various parameters have been optimized. Undoped and Aluminum
(Al) doped ZnO nanostructures were prepared by the SILAR technique. The
characterization of the nanostructures prepared was carried out using X-ray
diffraction (XRD), scanning elektron microscopy (SEM), energy dispersive
spectroscopy (EDS), X ray photoemission spectroscopy (XPS), UV Vis spectrometry
and nonlinear optical analysis (NLO). The structural, compositional and optical
properties confirm the introduction of Al3+ ions into the ZnO matrix. As a
result, an enhancement of the crystallinity, enhancement of the light
absorption and a change in the morphology of the nanostructures were observed.
The laser stimulated nonlinear optical effects of the second and third harmonic
generation were done using a fundamental laser beam. The laser stimulated NLO
values obtained are at least 10% higher than the doped ZnO nanomaterials
synthesized by other methods using the same set up.
