In this article, we report a novel but simple method for the phase transformation of ZnO sub(2) to flower-like ZnO microstructures hydrothermally at 90 degree C with and without the assistance of hexadecylamine as surfactant. The generation of zincate ion ZnO \documentclass{article}\usepackage{amssymb}\begin{document}\pagest y le{empty}$2-}_{2}$\end{document}Imageomitted as a growth unit from the reaction between ZnO sub(2) and peroxide ion O \documentclass{article}\usepackage{amssymb}\begin{document}\pagest y le{empty}$2-}_{2}$\end{document}Imageomitted in situ plays a key role in the phase transformation of ZnO sub(2) to ZnO. The morphology, structure, and composition of the products have been investigated by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Powder X-ray diffraction (PXRD) and energy dispersive X-ray analysis (EDX). It has been demonstrated that the as-fabricated ZnO flowers are composed of self-assembled brooms and rods in the presence and absence of hexadecylamine respectively. On the basis of experimental results, a possible reaction mechanism and the growth processes involved in the formation of flower-like ZnO microstructures are discussed. In this article, we report a novel but simple method for the phase transformation of ZnO sub(2) to flower-like ZnO microstructures hydrothermally at 90 degree C with and without the assistance of hexadecylamine as surfactant. The generation of zincate ion ZnO \documentclass{article}\usepackage{amssymb}\begin{document}\pagest y le{empty}$2-}_{2}$\end{document}Imageomitted as a growth unit from the reaction between ZnO sub(2) and peroxide ion O \documentclass{article}\usepackage{amssymb}\begin{document}\pagest y le{empty}$2-}_{2}$\end{document}Imageomitted in situ plays a key role in the phase transformation ...