An one-pot epitaxial growth method to synthesize cactus-like ZnO

In this work, we have developed a one-pot, morphology controlled epitaxial growth method to synthesize novel cactus-like ZnO in solution. Utilizing zinc acetate and hexamethylenetetramine as the precursors, ZnO nanorods synthesized in the first step remained in the solution, without any separation, served directly as the matrix for the epitaxial growth in the second step. Control experiments revealed that a proper mass of precursors added in the second step was crucial to form cactus-like ZnO. The as-synthesized ZnO was single crystalline and possessed three photoluminescence emissions centered at 390, 425 and 490 nm. Finally, a possible mechanism for the epitaxial growth ZnO was proposed and discussed.