Investigation of Thermal Transport Properties of Multilayer Porous Silicon Based Hybrid Nanostructures by Photoacoustic Technique

The paper presents the results of an experimental study of photoacoustic transformation in nanostructured hybrid systems “multi-layered porous silicon (mlPSi) / liquid”. The mlPSi nanostructures were grown by programmable electrochemical etching of highly doped monocrystalline silicon. The informative photoacoustic response was formed by the photoacoustic cell with gas-microphone registration in a classical configuration. The approach based on modelling the temperature distribution inside the nanostructure allows us to evaluate the thermal conductivity of mlPSi before and after incorporating the liquid inside the porous network. As a result of our experimental investigations, the rise of the thermal conductivity (up to 1.5 times) of the hybrid system “mlPSi / liquid” compared to the initial system was found. The presented approach can be easily adapted to study other composite nanostructures with a solid-liquid interface. The results obtained for hybrid systems “mlPSi / liquid” provide new paths for its practical implementation in the field of sensors and thermal management devices.