Effect of NaOH concentration on optical properties of zinc oxide nanoparticles

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

Average diameter of as-prepared ZnO nanoparticles obtained from field emission scanning electron microscope images_

Sample	Molar ratio	Average particle size
C1	1:1	60 nm
C2	1:2	58 nm
C3	1:3	52 nm
C4	1:4	50 nm

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