Figure 1From: Facile Fabrication of Ultrafine Copper Nanoparticles in Organic SolventLeft panel: UV–vis absorption spectra of (a) CuSO4EG solution, (b) pH 11solution, and (c) transitional colorless solution. Right panel: UV–vis absorption spectra of copper colloids A, B, and C, which are synthesized under different molecular ratios of PVP and CuSO4, viz., (a) 2:1, (b) 10:1, and (c) 20:1, respectivelyBack to article page