[Show abstract][Hide abstract] ABSTRACT: This paper describes the mineralization and morphosynthesis of CaCO3 on an Allium fistulosum L. bulb inner membrane by a double diffusion method and exhibits some ingenious structures of CaCO3 formed on both surfaces of the bulb membrane. Novel calcite ribbons with smooth surfaces and film coatings consisting of petal-like building blocks have been synthesized on the inner and outer surface of the bulb membrane when two surfaces faced CaCl2 solution, respectively. The presence of polyacrylic acid (PAA), a suitable pH value and the mixed solvent system are the key primary conditions for the formation of calcite ribbons. The surface of the bulb membrane acted as an insoluble matrix providing nucleation sites for CaCO3 crystals with different morphologies. The present double diffusion method involved using a plant system and its combination with a polyelectrolyte in a mixed solvent system provides a versatile, mild and flexible tool to control the size and shape of CaCO3 crystals, which may be extended for synthesis of other inorganic materials.
[Show abstract][Hide abstract] ABSTRACT: In-plane growth of Mg2SiO4 nanowires on Si substrates is achieved by using a vapor transport method with Au nanoparticles as catalyst. The self-assembly of the as-grown nanowires shows dependence on the substrate orientation, i.e., they are along one, two, and three particular directions on Si (110), (100), and (111) substrates, respectively. Detailed electron microscopy studies suggest that the Si substrates participate in the formation of Mg2SiO4, and the epitaxial growth of the nanowires is confined along the Si <110> directions. This synthesis route is quite reliable, and the dimensions of the Mg2SiO4 nanowires can be well controlled by the experiment parameters. Furthermore, using these nanowires, a lithography-free method is demonstrated to fabricate nanowalls on Si substrates by controlled chemical etching. The Au nanoparticle catalyzed in-plane epitaxial growth of the Mg2SiO4 nanowires hinges on the intimate interactions between substrates, nanoparticles, and nanowires, and our study may help to advance the developments of novel nanomaterials and functional nanodevices.
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