Table 1
List of final ZnO samples (C1-C4) obtained at different NaOH concentrations.
| Sample | Precursor concentration | Molar | Reaction temperature | Heating time | |
|---|---|---|---|---|---|
| Zinc acetate | NaOH | ratio | |||
| C1 | 0.1M | 0.1M | 1:1 | 90 °C | 2h |
| C2 | 0.1M | 0.2M | 1:2 | 90 °C | 2h |
| C3 | 0.1M | 0.3M | 1:3 | 90 °C | 2h |
| C4 | 0.1M | 0.4M | 1:4 | 90 °C | 2h |
(a) XRD pattern of as-prepared ZnO samples prepared at different NaOH concentrations (the inset shows variation of peak width and position of (1 0 1) peak with respect to NaOH concentration), (b) Uniform Deformation Model (UDM) of as-prepared ZnO nanoparticles using Williamson-Hall analysis (Tables show linear fit equation of the corresponding sample), (c) variation of crystallite size of as-prepared ZnO nanoparticles with respect to molar ratio.
SEM images showing morphology of the ZnO samples prepared at different temperatures: (a) C1,(b) C2, (c) C3, and (d) C4.
Photoluminescence spectra of as-prepared ZnO nanoparticles excited at 320 nm exciton absorption wavelength.
Raman spectra of as-prepared ZnO nanoparticles (the inset shows the Raman shifts for stan-dard ZnO).
Table 2
Calculated values of average crystallite size and strain for the as-prepared ZnO nanoparticles by UDM (W-H plot) and Scherrer formula.
| Sample | Average crystallite size | Strain (є) | |
|---|---|---|---|
| UDM (W-H plot) Scherrer formula | |||
| C1 | 55 nm | 40 nm | 2.133 × 10—3 |
| C2 | 51 nm | 38 nm | 2.163 × 10—3 |
| C3 | 40 nm | 30 nm | 2.743 × 10—3 |
| C4 | 31 nm | 23 nm | 3.597 × 10—3 |