METHOD FOR MEASURING THERMAL CONDUCTIVITY OF THIN FILM BASED ON FLUORESCENT MICRO-NANO-PARTICLES

摘要

A method for measuring thermal conductivity of a thin film based on fluorescent micro-nano-particles, comprising: providing fluorescent micro-nano-particles, heating the fluorescent micro-nano-particles, and determining a temperature coefficient by measuring the relationship between PL spectrum (photoluminescence spectra) characteristic peak displacement of the fluorescent micro-nano-particles and temperature change (S1); placing a thin film to be detected on a substrate, and placing a heat-absorbing resource and the fluorescent micro-nano-particles on the surface of the thin film to be detected (S2); irradiating the thin film to be detected with laser, and determining a relationship slope by measuring the relationship between the PL spectrum characteristic peak displacement of the fluorescent micro-nano-particles and the laser power change (S3); and measuring the thermal conductivity of the thin film by combining an optical power absorption coefficient of the heat-absorbing resource and shape characteristic parameters of the thin film to be detected (S4). The measuring method can realize nondestructive, convenient and reliable measurement of the thermal conductivity of the micro-nano-thin film.