1：Experimental Design and Method Selection

The study involved the preparation of fluorinated graphene (FG) and its exposure to NH3 to observe color changes. Density functional theory calculations were used to understand the interaction between FG and NH3.

2：Sample Selection and Data Sources

FG was prepared by annealing graphene and XeF2 in a Teflon container. NH3 detection was performed by placing FG in a quartz tube with a flow of a mixture of NH3 and Ar.

3：List of Experimental Equipment and Materials

Field emission scanning electron microscope (FE-SEM, ZEISS-ULTRA55, Germany), transmission electron microscope (TEM, Tecnai G2 F20, USA), atomic force microscope (AFM, Veeco dimension V, USA), spectrofluorophotometer (Shimadzu RF-5301PC), CHN-Rapid elemental analyzer (Heraeus, Germany), Fourier transform infrared spectroscopic (FTIR) measurements (Nexus870, NICOLET, USA), thermogravimetry/derivative thermogravimetry (TG/DTG) measurement (Pyris 1 DSC, USA), XPS spectra (PHI5000 VersaProbe, ULVAC-PHI, Japan).

4：Experimental Procedures and Operational Workflow

FG was exposed to NH3 at various concentrations, and the color change was observed. PL measurements were conducted to quantify the response. DFT calculations were performed to analyze the adsorption and charge transfer mechanisms.

5：Data Analysis Methods

PL intensity was used to calculate the relative response to NH3. DFT calculations provided insights into the adsorption energy and charge transfer between FG and NH3.