Figure 4 | Scientific Reports

Figure 4

From: A mild aqueous synthesis of ligand-free copper nanoparticles for low temperature sintering nanopastes with nickel salt assistance

Figure 4

Results of (a) FE-SEM observations and (b) XRD measurements of solid particles formed by various ratios of [reducing agents]/[CuO]. Hydrazine, sodium borohydride (NaBH4), and ascorbic acid (AA) were chosen as the reducing agents. (i) [N2H4]/[CuO]: 1.0; (ii) [N2H4]/[CuO]: 2.0; (iii) [N2H4]/[CuO]: 8.0; (iv) [N2H4]/[CuO]: 16; (v) [NaBH4]/[CuO]: 4.0; (vi) [AA]/[CuO]: 4.0;. The scale bar shown in (a)-(vi) is common for all images in (a).

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