Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5348944 | Applied Surface Science | 2015 | 38 Pages |
Abstract
The present study reports the effects of NaOH concentrations in hydrothermally grown ZnO nanostructures on structural, optical and ferroelectric properties at different selected NaOH molar concentrations (3-7Â M). X-ray diffraction, Raman and photoluminescence analysis confirms the formation of pure phase of ZnO. FESEM images show that the average grain size of ZnO nanostructures increases from 61 to 95Â nm as molar concentration increases from 3 to 7Â M, respectively. Transmission electron microscope analysis also reveals that an average grain size of ZnO nanostructures increases from 34 to 55Â nm as molarity increases from 3 to 7Â M concentrations. A significant reduction in the optical band gap is observed from 4.41 to 3.96Â eV by increasing molar concentration from 3 to 7Â M, respectively. The decrease in the band gap with molar concentration could be due to the increase of density of localize state in the conduction band. Furthermore, ferroelectricity is observed in ZnO nanostructures at room temperature which is interesting and adds an additional dimension to its applications.
Related Topics
Physical Sciences and Engineering
Chemistry
Physical and Theoretical Chemistry
Authors
Prakash Chand, Anurag Gaur, Ashavani Kumar, Umesh Kumar Gaur,