Transient Thermal Characterization of Single Anatase TiO2 nanowire with secondary porous structure

Introduction Single anatase TiO2 nanowire is synthesized using electrospinning technique and is then bridged over a preprocessed 100 m-wide TEM grid for thermal characterization. Transient electrothermal method is applied with proper calibration process for determining major thermophysical properties. SEM diagnostics of the sample show that calcinations for crystal structure transition from amorphous to anatase has induced distinct porous surface structure. This porous structure implies interior porous structure and lower density. Also, due the reduced density and enhanced grain boundary scattering, phonon transport is hindered and therefore the thermal conductivity is measured to be lower than value of bulk counterpart. Furthermore, nonlinear effects are also examined and further analyzed to acquire more precise thermophysical properties.