A changed state of silver nanoparticles upon the adsorption of acrylic acid and low-temperature treatment

Plasma-resonance absorption spectra of silver hydrosol were recorded and analyzed to estimate the influences of acrylic acid (AA) as an additive and subsequent low-temperature treatment (LTT) of the sol at 77 K on the state of silver nanoparticles. It was found that AA adsorbs in two forms with different orientations of its molecules. Low-temperature treatment resulted in aggregation of particles because of their more defective surfaces, which is characterized by the damping factor of plasmon vibrations. In the adsorption of AA, the damping factor also increases, but the cryoaggregation of particles decreases. © 2008 MAIK Nauka