Crystalline Bi 2 S 3 nanorods, nanotapes, and nanocrystals were obtained from the solvent thermalysis of bismuth trisxanthate precursors and related bismuth dithiocarbamate species in ethylene glycol at 197 °C. Precursors with different structural motifs were designed to produce compounds with different thermal decomposition temparatures, i.e., the dimeric motif of Bi(S 2 COR) 3 when R ) methyl and ethyl was found to have a lower decomposition temperature compared to precursors adopting the polymeric structure, so that solvothermalysis of the former gave rise to short nanocrystals; while in the case of the latter, long nanofibers were produced instead. Chemical vapor deposition on silicon substrates yielded well-defined nanorods of various lengths and diameters for almost all precursors. Internal microstructure of the nanorods was studied by high-resolution transmission electron microscopy.
Uniformly distributed ZnO nanorods with diameter 80–120nm and 2μm long have been grown at low temperatures on gallium nitride (GaN) by using the inexpensive aqueous solution method. The formation of the ZnO nanorods and the growth parameters are controlled by reactant concentration, temperature and pH. No catalyst is required. The x-ray diffraction (XRD) and transmission electron microscopy (TEM) studies show that the ZnO nanorods are single crystals and they grow along the c axis of the crystal plane. The room temperature photoluminescence (PL) measurements have shown ultraviolet peaks at 388nm with high intensity, which are comparable to those found in high quality ZnO films. The mechanism of the nanorod growth in the aqueous solution is also proposed.
We demonstrate a simple method to direct the self-assembly of ZnO nanorods on flat and curved surfaces in
hydrothermal synthesis by precoating the substrate with a thin film of aluminum (Al). The Al was transformed
in the alkali hydrothermal environment into hydrotalcite-like zinc aluminum carbonate sheets, which provide
a lattice-matched substrate for the self-assembly of ZnO nanorods. Selective growth of ZnO nanorods on the
Al-patterned substrate as well as the high-density coating of carbon nanotubes by ZnO nanorods along the
tangential and radial walls has been demonstrated using hydrothermal synthesis. The interfacial chemistry
involved in the growth of ZnO and hydrotalcite-like zinc aluminum carbonate sheets is also discussed.
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