Abstract
This paper focuses on the synthesis of shaped copper-silver nanoparticles (CuAg NPs) via microwave irradiation (MW). CuAg NPs were formed by reacting aqueous copper(II) nitrate hemi(pentahydrate) (Cu(NO3)2.2.5H2O), silver nitrate (AgNO3) and sodium acrylate (C3H3NaO2) at room temperature (RT) and hydrothermal temperature (HT). Shape formation was influenced by the HT and the sequence of reducing the precursors. By reducing Cu(NO3)2.2.5H2O and AgNO3 with C3H3NaO2 at different temperatures and manipulating the reduction sequence, variable sizes and shapes of CuAg core-shell NPs were formed. When Ag+ ions were reduced on preformed Cu NPs at RT, spherical NPs that featured (111) faucets were produced. The MW synthesis produced octahedra and rods NPs depending on whether Cu2+ and Ag+ ions were co-reduced or Ag+ ions were reduced on preformed Cu NPs. The morphology was examined by high transmission electron microscopy (HRTEM). The NP compositions were examined via scanning transmission electron microscopy - energy dispersive spectroscopy (STEM-EDS) and X-ray photoelectron spectroscopy (XPS).
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