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

This dataset contains experimental and analytical data obtained from a mid-infrared (MIR) photothermal spectroscopic system constructed on the basis of atomic force microscopy (AFM). 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. The data include measurements of thermal conductivity variations across WS₂ layers (1–5 layers), which demonstrate enhanced phonon coupling effects and validate the feasibility of on-chip thermal conduction analysis via MIR photothermal techniques.This version of the dataset contains all the original measured data, including photothermal and Raman signals. The filenames within the dataset indicate the corresponding experimental conditions, such as excitation wavelength, laser power, and other relevant parameters.