Bio-based synthesis of oxidation resistant copper nanowires using an aqueous plant extract

Highly Electroconductive Nanopapers Based on Nanocellulose and Copper Nanowires: A New Generation of Flexible and Sustainable Electrical Materials

“…The digital photographs of the obtained NFC/CuNWs nanopapers (Figure 1B) reveal a homogeneous appearance, suggesting a good dispersion of the CuNWs within the nanocellulose fibrils. The pristine NFC nanopaper presents a white color, while the nanopapers show the characteristic red brick color of CuNWs, 37 with the color darkening as the amount of CuNWs increases. Furthermore, the incorporation of CuNWs significantly reduces the translucency as the nanomaterials start to become fully opaque for CuNW mass fractions above 5 wt % (Figure 1B), as clearly supported by the corresponding transmittance spectra (Figure 2).…”

“…26,30−32 In recent years, copper nanostructures have been considered a good alternative to silver counterparts in several applications because this element is almost 1000 times more abundant than silver, 100 times less expensive, less vulnerable to the electromigration effect when used in microelectronics, and only 6% less electrically conductive. 33,34 The increasing interest in copper nanostructures has also boosted the development of scalable and straightforward synthetic procedures, 35,36 new biobased approaches, 37 and simple purification methodologies. 38,39 Although copper nanostructures can be oxidized by air, several studies demonstrated that specific morphologies, such as Cu nanowires, present higher stability under normal air conditions, 40,41 and that this resistance can be improved, for example by coating the nanowires with PEDOT:PSS 42 or phenylenediamine isomers.…”

“…Conductive nanomaterials based on nanocellulose and metallic nanofillers are among the most promising ones due to the high conductivity of metal nanostructures, with most studies focusing on the use of silver nanostructures, either nanowires (NWs) − or spherical nanoparticles. ,− In recent years, copper nanostructures have been considered a good alternative to silver counterparts in several applications because this element is almost 1000 times more abundant than silver, 100 times less expensive, less vulnerable to the electromigration effect when used in microelectronics, and only 6% less electrically conductive. , The increasing interest in copper nanostructures has also boosted the development of scalable and straightforward synthetic procedures, , new biobased approaches, and simple purification methodologies. , …”

Oleic acid/oleylamine ligand pair: a versatile combination in the synthesis of colloidal nanoparticles

“…These bio-based Cu NWs were resistant to oxidation when stored in ethanol and even after exposure to air. 315 Furthermore, Rossi et al explored the synthesis of Cu NPs via the thermal decomposition of copper( ii ) acetate in diphenyl ether with OAc/OAm in the presence or absence of 1,2-octanediol. Consequently, air-stable Cu(0) NPs were formed.…”

Plant-Extract-Mediated Synthesis of Metal Nanoparticles

“…Meanwhile, it was found that the CuNPs could generate free radicals to catalyze the degradation of two drugs, 5-fluorouracil and lovastatin. Pinto et al [78] used different concentrations of aqueous extracts of Eucalyptus globulus bark to reduce copper chloride dihydrate in oleamide, oleic acid, and ethanol systems, respectively, for 2 h at 120°C to produce CuNPs. Meanwhile, the phytoactive components of the extracts were attached to CuNPs, rendering CuNPs with better antioxidant and conductive effects.…”