Site-selective deposition of UV- and visible-light-emitting ZnO crystals was successfully achieved in an aqueous
solution at low temperature. Molecular recognition was effectively utilized for patterning of ZnO crystals on self-assembled monolayers.
Crystalline ZnO was further controlled to have different morphologies such as cylindrical hexagonal rods, ellipses, or multineedle
shapes by changing the solution conditions to improve the photoluminescence properties. All of the morphologies emitted strong
photoluminescence in UV and visible regions with different emission spectra. The novel process shows the high potential of solution
processes for fabricating nano/microdevices constructed from crystalline materials for visible-light-emitting devices.
A hydrotalcite-like film has been successfully deposited on an Al-bearing glass substrate based on an interface reaction between an Al layer and a zinc aqueous solution. The film selectively grew on the Al surface but not on the glass surface. The film on Al was composed of layered nanosheets of a hydrotalcite-like compound containing Al and Zn. Comparably, deposits on the plastic surface and precipitates in solution were wurzite-type ZnO with various morphologies depending upon the preparation conditions. At low supersaturation degrees, single crystals and superstructures of Zn-Al hydrotalcite were also obtained. This porous hydrotalcite film has a potential application as catalyst supports, environmental materials, or matrixes for hydrotalcite-based nanocomposite films. Using Al as a reaction interface makes it easy to coat porous hydrotalcites on a series of matrix materials varying in shapes and properties, which is important for achieving practical applications. In addition, the method developed should be widely applicable to other systems for the preparation of porous or oriented hydrotalcite-like thin films by an appropriate combination of divalent/trivalent solution-substrate systems.
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