Abstract
This study explores the laser-induced hydrothermal synthesis of ZnO nanostructures, focusing on the influence of various growth parameters. Using a laser to locally heat the synthesis solution, we achieved controlled growth of ZnO nanostructures. We examined the effects of laser power, exposure time, reagent concentration, and the addition of polyethyleneimine (PEI) on the morphology and distribution of the nanostructures. Results indicate that higher laser powers and extended exposure times lead to increased nanostructure diameters and heights, though they also introduce growth instability. Lower reagent concentrations produce needle-like structures, while higher concentrations yield larger but irregular formations. The addition of PEI accelerates growth, resulting in longer nanorods with reduced height variation but causes a chaotic structural arrangement and the formation of parasitic nanostructures. These findings underscore the critical role of growth parameters in tailoring the properties of ZnO nanostructures for potential applications.