Samples

a (nm)

b (nm)

c (nm)

β (˚)

CuO-NPs annealed at 200˚C

0.466789

0.342411

0.511844

99.3485

CuO-NPs annealed at 400˚C

0.467401

0.342340

0.512304

99.3890

CuO-NPs annealed at 600˚C

0. 468323

0.342244

0.512795

99.5005

Standard tenorite (CuO)

0.468830

0.342290

0.513190

99.5100