Figure 2_XPS_Raw data

This dataset contains the raw X-ray Photoelectron Spectroscopy (XPS) data acquired for the study “Improving Pyrogallol–Polyethyleneimine Flame-Resistant Coatings on Tree Bark via Low-Dose Phytic Acid.” The data include full survey and high-resolution spectra (C 1s, N 1s, O 1s, and P 2p regions) collected from uncoated wood, PG–PEI-coated, and PA–PG–PEI-coated samples (0.1, 0.3, and 0.5 wt% PA), both before and after combustion. All measurements were performed using a Nexsa G2 XPS System (Thermo Fisher Scientific, USA) with Al Kα radiation (1486.6 eV) under ultra-high vacuum conditions. The dataset supports elemental quantification, peak deconvolution, and surface chemical state analysis reported in the main manuscript.