Abstract
Abstract A facile and efficient combustion synthesis method is proposed to synthesize single-crystal silver nanoparticles (AgNPs) by using high chemical activity nano-aluminum powder as a reducing agent and silver oxide as an oxidant. The synthesized samples were characterized by means of scanning electron microscopy, transmission electron microscopy, X-ray diffraction, and ultraviolet–visible spectroscopy analysis. The results indicate that the as-prepared spherical AgNPs are of a single-crystal structure with an average size of about 40 nm. Moreover, the formation mechanism of AgNPs was also investigated by closed bomb test and high-speed video recording. It is observed that a large amount of energy which is released instantaneously makes the reaction occur at a rapid speed, so that the nucleation rate of AgNPs is greater than the growth rate. This study opens up a promising route for high-yield and high-quality AgNPs, as well as various other metal nanoparticles.
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