UV Spectrum result in a wave length range of CU nano particles.
Cu nanoparticles shows UV-vis absorption spectrum exhibited an absorption band at 572-582 nm.
Check the following references
1)Synthesis of high-concentration Cu nanoparticles in aqueous CTAB solutions
http://www.sciencedirect.com/science/article/pii/S0021979704001432
2) Synthesis, Characterization, and Nonlinear Optical Properties of Copper Nanoparticles
http://pubs.acs.org/doi/abs/10.1021/la9605495
Also Cu nanoparticles shows UV-vis absorption spectrum exhibited an absorption band at 572-582 nm, 200-300 and around 400nm
Open-source UV-Vis Spectroscopy Library for Nanomaterials,
https://www.instanano.com/2021/01/uv-vis-open-source-reference-liberary.html
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