Correlating Temperature Change with Heat Conduction Process via Mid-Infrared Photothermal Method

The data were generated to study the correlation between temperature change and the heat conduction process in polystyrene microspheres (PSMS) and PSMS–WS₂–Au heterojunctions.We developed an MIR photothermal spectroscopic setup using an AFM platform.

A mid-IR laser served as the pump source, while a visible probe laser monitored the induced volume expansion of PSMS caused by vibrational relaxation. This configuration enabled the acquisition of high-precision IR absorption spectra.An integrated Raman spectrometer was employed to calibrate the linear dependence between PSMS particle temperature and IR pump power at its absorption energy. The results confirmed a linear relationship between the temperature of PSMS and the far-field pump intensity.Further, through AFM tip manipulation, PSMS–WS₂–Au thermal heterojunctions were fabricated.