Microstructure of high c-axis oriented stand-alone ZnO self-assembled film.
Stand-alone ZnO films were fabricated at air-liquid interfaces. The Microstructures of the films were observed precisely using a transmission electron microscope (TEM) in this study. They were assemblies of nano-sheets having uniform film thickness. The nano-sheets grew down toward the bottom of solutions by the supply of Zn ions from the solutions. X-ray diffraction patterns indicated high c-axis orientation of the films perpendicular to the air-liquid interface. An area of the nano-sheets was magnified for further observation. Electron diffraction patterns and lattice images indicated that the nano-sheets consisted of ZnO crystals. A slight amount of co-precipitated zinc carbonate hydroxide (Zn5(CO3)2(OH)6) was also observed. Their morphologies were drastically changed by electron beam irradiation because of dehydration and crystallization to ZnO.
National Institute of Advanced Industrial Science and Technology, 2266-98 Anagahora, Shimoshidami, Moriyama-ku, Nagoya 463-8560, Japan.
Yoshitake
Y
Masuda
Kazumi
K
Kato