Green Synthesis of Copper Nanoparticles Using Flower Extracts: A Promising Route for Enhanced Microelectronics Packaging

Abstract

This works aims to prepare a highly dispersible, high electrical and thermally conductive, low cost copper nanoparticles, with an average particle size of 30–40[Formula: see text]nm, by reducing an aqueous solution of copper(II) solution through bio-route using leaves of senna auriculata (Cassia Auriculata flowers). The resultant copper nanoparticles (CuNPs) possess a reduction in melting point which can be suitably used as a conductive copper nanoink material for printed circuitry boards and also as a low-cost replacement for silver and gold nanoinks in inkjet printing of conductive patterns. The green-synthesized CuNPs are characterized using FT-IR, UV-Visible, and photoluminescence studies and scanning electron microscopic (SEM) and X-ray diffraction studies. All the obtained results confirmed the presence of copper nanoparticles in the sample. The prepared CuNPs is expected to provide promising advances as nanopastes for sustainable fabrication of copper electrodes and die attachment materials for the production of next-generation power semiconductors.