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In this work, a facile grinding method for preparation of supramolecular square nanoplates formed by β-cyclodextrin and gallium acetylacetonate was developed. The nanoplates exhibited a highly monodispersed distribution nature at room temperature, and were self-assembled to form supramolecular layer nanosheets at 353 K. Heating to higher temperatures such as 673 K led to the decomposition of the layer nanosheets into γ-Ga2O3 layer nanosheets. The γ-Ga2O3 nanosheets (thickness of about 15 nm) with a very high specific surface area (93.9 m2 g−1) show an improved solar-blind detection performance (e.g., light–dark ratio, 1.64 × 104) compared to devices based on 3D structured γ-Ga2O3. We believe that the grinding-heating-strategy provides a convenient and efficient route to synthesize high-quality supramolecular nanocrystals and inorganic nanomaterials.

In this work, we successfully synthesized ZnGa2O4 microflowers self-assembled by hexagonal single-crystalline nanopetals in a water/ethanol solution through a novel solvothermal route. The self-assembled ZnGa2O4 microflower crystal exhibits improved solar-blind deep ultraviolet detection performance such as short response time, large light to dark current ratio, high photocurrent stability, and good wavelength selectivity under zero bias voltage, with the aid of the formation of heterojunctions with polyvinyl butyral. Our result is not only the best for self-powered solar-blind photodetect devices to date, but also the first report describing the effect of polymer concentrations on photoresponses.