Antibacterial Activities of Silver Nanoplates Controlled by Pulsed Laser

Abstract

Silver nanoplates coated with gold, when subjected to pulsed laser irradiation, changed their shape from triangular to spherical structure along with the shift of their extinction spectra. Simple crystal structure of the silver nanoplates changed to multiple small crystal domains. The ratio of silver to gold on the surface also changed from 22:1 to 4.5:1 enabling more silver to be released. As a result, the antibacterial activity of gold-coated silver nanoplates was significantly increased after pulsed laser irradiation.