Abstract
A new method was introduced for determination of absorptivity and subsequent determination of concentration and size of silver nanoparticles (AgNPs). Without using any complicated instrument, based on a kinetic reaction of AgNPs, a ratio curve is extracted and chemometrically fitted to obtain the absorptivity of the AgNPs. Afterwards, it can be possible to estimate size of the AgNPs based on the reported relations. The method can be simply used for any NPs provided that it can absorb in UV–Vis region of the electromagnetic spectrum and after employing in a kinetic reaction. The agreement between the calculated diameter of the AgNPs based on the absorptivity derived from the method and the transmission electron microscopy (TEM) imaging were excellent. It can be claimed that this is the most direct method to determine NPs absorptivity and concentration.
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