Abstract
In this study, a novel superstructure of hexagonal rose-like ammonioalunite was produced by hydrothermal synthesis in acidic condition. Urea was a precipitant in the system. The sharp peaks in the XRD pattern and the clear electron diffraction spots in selected-area electron diffraction (SAED) pattern indicated that ammonioalunite was highly crystallized. SEM images proved that the average diameter of the prepared ammonioalunite is ∼8 μm with a thickness of ∼6 μm. This highly ordered 3D superstructure can expand the scope of potential applications of ammonioalunite in the areas of ceramics, catalysis, electronics, and optoelectronics. The possible mechanism is that the rose-like ammonioalunite was obtained by self-assembling from nanosheets with spiral growth.
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