Nanosecond pulsed laser heating of colloidal copper nanoparticles in water

摘要

In this study, localized heating of homogenous spherical copper nanoparticles surrounded by water on exposure to short laser pulses is investigated. We are intended to estimate the maximum temperatures of nanoparticles by calculating the absorption efficiency and absorbed energy with some radii in the range 1-50 nm at the laser wavelengths of 248 and 633 nm using Mie theory. The dependency of the melting temperature of nanoparticles upon the particle size is also considered. Our calculations show the appropriate laser wavelength and nanoparticle size which are preferred for large area heating, localized heating without thermal damage or completely localized destroying of small amount of species and polymeric materials modification. The significant temperature rising and the heat transfer to the immediate vicinity is of exceptional interest in selective cell targeting, diagnosis and therapeutic applications, surface modification, and particle removing below damage threshold energy of surrounding media.