Liquid-Modulated Photothermal Phenomena in Porous Silicon Nanostructures Studied by μ-Raman Spectroscopy
Oksana G. Makukha, Ivan Lysenko, Ali Belarouci
Abstract
In the present study, the effect of liquid filling of the nanopore network on thermal transport in porous Si layers was investigated by μ-Raman spectroscopy. The values of thermal conductivity of porous Si and porous Si-hexadecane composites were estimated by fitting the experimentally measured photoinduced temperature rise with finite element method simulations. As a result, filling the pores with hexadecane led to (i) an increase in the thermal conductivity of the porous Si-hexadecane composite in a wide range of porosity levels (40-80%) and (ii) a suppression of the characteristic laser-induced phase transition of Si from cubic to hexagonal form.
Topics & Concepts
Photothermal therapyPorous siliconRaman spectroscopyMaterials scienceSiliconNanostructureNanotechnologySpectroscopyPorosityPhotothermal spectroscopyChemical engineeringOptoelectronicsOpticsComposite materialPhysicsQuantum mechanicsEngineeringNanowire Synthesis and ApplicationsSilicon Nanostructures and PhotoluminescenceThermal properties of materials