1. Facile synthesis of low dimensional CuO nanostructures and their gas sensing applications
- Author
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N. Gopalakrishnan and S. Bhuvaneshwari
- Subjects
Diffraction ,Nanostructure ,Materials science ,Band gap ,Analytical chemistry ,Nanotechnology ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,medicine.disease ,01 natural sciences ,Hydrothermal circulation ,0104 chemical sciences ,chemistry.chemical_compound ,Ammonia ,chemistry ,medicine ,General Materials Science ,Nanorod ,Methanol ,0210 nano-technology ,Vapours - Abstract
A simple and cost effective hydrothermal method has been employed to synthesis morphology controlled pure and Cr doped (4 and 8 at. %) CuO nanostructures. Crystalline purity and structure of the nanostructures were validated by X-ray diffraction and Retvield analyses. Field emission scanning electron microscopy revealed the evolution of rod-like, sheet-like and boat-like morphologies for pure, 4 and 8 at. % Cr doped CuO nanostructures respectively. The optical band gap estimated using the K-M function plot from diffused reflectance spectroscopy showed a shift in band gap from 1.68 to 1.90 eV with respect to Cr concentration. The synthesized CuO nanostructures were investigated for the efficient room temperature gas sensing of ammonia, ethanol and methanol vapours under different concentrations (100-600 ppm). The 8 at. % Cr doped CuO nano-boats showed enhanced gas sensitivity than other CuO nanostructures owing to their typical morphology, larger surface area and related properties. more...
- Published
- 2016
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