Abstract
Monoclinic ZrO2 with a nanosheet structure has been successfully synthesized via the thermal transformation of NH4Zr2F9 using a high-temperature ionothermal synthesis. The samples were characterized by using X-ray diffraction, field emission scanning electron microscopy, transmission electron microscopy, atomic force microscopy, and conductivity measurements with a multiprobe. The result indicates that the as-prepared samples have a single crystal sheet structure with a thickness of 4 nm. To the best of our knowledge, a thin film of single crystal monoclinic ZrO2 has not been reported, even though ZrO2 is an important material. In the absence of the ionic liquid (butyl-2,3-dimethylimidazolium tetrafluoroborate), the thermal transformation of NH4Zr2F9 produced porosity within the two-dimensional structure, whereas in the presence of the ionic liquid, the homogeneous sheet structure was maintained without porosity. The decomposition temperature of the ionic liquid and transformation temperature of NH4Zr2F9 ...
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