| Abstract
| - Ultralong Cd(OH)2 nanowires were fabricated by a hydrothermal method from Cd(CH3COO)2·2H2O (0.01 mol/L)and C6H12N4 (0.015 mol/L) aqueous solution at 95 °C for 16 h without using any templates and were characterizedby scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM), selectedarea electron diffraction (SAED), and high-resolution transmission electron microscopy (HRTEM). The length of thenanowires reached several micrometers, giving an aspect ratio of a few thousands. The formation mechanism of thenanowires is attributed to the oriented attachment of small particles. The growth method for the 1D nanostructurepresented here offers an excellent tool for the design of other advanced materials with anisotropic properties. TheCd(OH)2 nanowires efficiently captured negatively charged dye, and the adsorbed dye molecules can be released afterthe addition of EDTA. The Cd(OH)2 nanowires as template compounds were further transformed into CdO semiconductornanomaterials with similar morphology by calcination under 350 °C in air for 3 h.
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