Abstract
A green hydrothermal method was proposed for the controllable synthesis of ZnO 2 nanocrystals and ZnO nanorods, using the common and cost-effective 2ZnCO 3·3Zn(OH) 2 powder and 30 mass% H 2O 2 aqueous solution as the raw materials. The characterization results from X-ray diffraction, high resolution transmission electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy indicated that the products synthesized at 100–120 °C for 6 h or at 170 °C for 0 h were cubic phase ZnO 2 nanocrystals; while those synthesized at 170 °C for 3–6 h were hexagonal phase ZnO nanorods. The UV–vis absorption spectra showed that the as-synthesized ZnO 2 nanocrystals and ZnO nanorods had optical band gaps of about 4.1 and 3.3 eV, respectively.
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