Preparing Copper Nanoparticles and Flexible Copper Conductive Sheets

Abstract

Nanotechnology is used in a wide range of fields, including medicine, cosmetics, and new material development, and is one of the most popular technologies in the field of flexible electronic products. For the present work, the chemical reduction method with environmentally friendly reducing agents was used to synthesize copper nanoparticles (CuNPs) with good dispersibility. The CuNPs were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), and ultraviolet–visible spectrophotometry (UV–vis). After the CuNPs were formed, the solvent, polymers, and additives were added to form copper ink. Finally, the prepared copper inks were applied to flexible polyethylene terephthalate (PET) substrate under low sintering temperature and the effects of sintering time and different concentrations of sintering agent on resistivity were investigated. The results show that the copper nanoparticles synthesized by secondary reduction were smaller, more uniform, and better dispersed than those formed by primary reduction. Ethylene glycol has reducing effects under high temperatures; therefore, the CuNPs formed using the mixed solvent were small and well dispersed. The copper ink was applied on the PET substrate, treated with a formic acid aqueous solution, and sintered at 130 °C for 60 min, and its resistivity was about 1.67 × 10−3 Ω cm. The proposed synthesizing method is expected to have potential applications in the flexible electronic products field.

Green Synthesis of Gold and Copper Nanoparticles by Lannea discolor: Characterization and Antibacterial Activity

“…As such, during both synthesis and drying, the CuNPs undergo sintering, and the well-connected features are observed in Figure 4B. Sintering techniques have been standardized to produce chemically synthesized CuNPs for copper inks used in conductivity [31,32]. Yet, no work has been reported employing a sintering temperature as low as 60 • C for CuNPs from Lannea discolor extracts.…”

“…Yet, no work has been reported employing a sintering temperature as low as 60 • C for CuNPs from Lannea discolor extracts. The literature reports that the optical and electronic properties of NPs depend on morphology [32,33], granting CuNPs potential in these applications.…”

Green Synthesis, Characterization and Antibacterial Activity of Gold and Copper Nanoparticles from Lannea discolor (Sond.) Engl

“…As such, during both synthesis and drying, the CuNPs undergo sintering, and the well-connected features are observed in Figure 4B. Sintering techniques have been standardised to produce chemically synthesised CuNPs for copper inks used in conductivity [31,32], yet no work has been reported employed sintering temperature as low as 60 •C for CuNPs from Lannea discolor extracts. Literature reports that the optical and electronic properties of NPs depend on morphology [32,33], rendering CuNPs as potentials in these types of applications.…”

Burdock-Derived Composites Based on Biogenic Gold, Silver Chloride and Zinc Oxide Particles as Green Multifunctional Platforms for Biomedical Applications and Environmental Protection

“…MNPs (Ag [ 4 ], Cu [ 5 ], Au [ 6 ], Pt [ 7 ], Zn [ 8 ]) have received increasing attention in various fields such as electronics [ 8 , 9 , 10 , 11 ], optics [ 12 ] and biomedicine [ 6 , 13 ], due to their properties, e.g., the very large specific surfaces of MNPs that determine their catalytic properties [ 14 ]. This has led to the active use of MNPs as catalysts for a variety of industrial processes, e.g., environmental cleaning [ 15 , 16 ].…”