Table 2.

Bandgap values of CuO nanoparticles.

Nanoparticles	${\mathbf{E}}_{\mathbf{g},\mathbf{s}\mathbf{u}\mathbf{s}\mathbf{p}\mathbf{e}\mathbf{n}\mathbf{s}\mathbf{i}\mathbf{o}\mathbf{n}}^{\mathbf{A}\mathbf{b}\mathbf{s}}$, eV	Excitation ${\lambda }_{\mathrm{g},\mathrm{s}\mathrm{o}\mathrm{l}\mathrm{i}\mathrm{d}}^{\mathrm{P}\mathrm{L}}$, nm	${\mathbf{E}}_{\mathbf{g},\mathbf{s}\mathbf{o}\mathbf{l}\mathbf{i}\mathbf{d}}^{\mathbf{P}\mathbf{L}}$, eV
CuO-ns	2.62 ± 0.01	266	2.62 ± 0.06
	4.91 ± 0.05		3.4 ± 0.1
CuO-np	2.47 ± 0.01	264	2.46 ± 0.05
	……		2.6 ± 0.1
	4.82 ± 0.06		3.4 ± 0.1