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Figure 1

From: Ambient Aqueous-Phase Synthesis of Copper Nanoparticles and Nanopastes with Low-Temperature Sintering and Ultra-High Bonding Abilities

Figure 1

Crystal structure analysis and morphological observation of copper NPs. (a) XRD patterns of the copper NPs obtained with different molar ratios of [NTA H 2Na]/[Cu(OH)2]: (i) Cu1: 0; (ii) Cu2: 1.69; (iii) Cu3: 2.0; and (iv) Cu4: 2.4. All reactions were carried out at 25 °C for 1 h. (b) SEM images of the copper NPs formed by the changing the molar ratio of [NTA H 2Na]/[Cu(OH)2]: (i) Cu1: 0; (ii) Cu2: 1.69; (iii) Cu3: 2.0; and (iv) Cu4: 2.4. The scale bar shown in (iv) is the same for (i)–(iii). Insets in (iii) and (iv) are the 2-fold magnified images.

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