1：Experimental Design and Method Selection:

MWCNTs were synthesized by aerosol-assisted chemical vapor deposition (A-CVD) method and iodinated under increased pressure (~20 bar) at 400°C.

2：Sample Selection and Data Sources:

Pristine MWCNTs were synthesized and then iodinated. Characterization was performed using X-ray diffraction (XRD), Raman and Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) coupled with energy dispersive X-ray spectroscopy (EDX), UV-VIS absorption, and photoluminescence (PL) spectroscopy.

3：List of Experimental Equipment and Materials:

Equipment included a Carle Zeiss device (Sigma VP) for SEM, Peltier cooled dry EDS system (Thermo Scientific Noran System 7) for EDX, Nanofinder 30 Confocal Laser Microspectrometer for Raman spectroscopy, Bruker 5000 diffractometer for XRD, Nicolet IS 10 FTIR spectrometer, Cary 60i UV-Visible spectrophotometer, and an IK series He–Cd laser for PL measurements. Materials included cyclohexane, ferrocene, xylene, ethanol, and crystalline iodine.

4：Experimental Procedures and Operational Workflow:

MWCNTs were synthesized, purified, iodinated, and then characterized using the aforementioned techniques.

5：Data Analysis Methods:

Data were analyzed to confirm the presence of iodine atoms in MWCNTs and to study the optical and emission properties.