Synthesis of PEG-Iodine-Capped Gold Nanoparticles and Their Contrast Enhancement in In Vitro and In Vivo for X-Ray/CT

Table 1

X-ray photoelectron spectroscopic data analysis for gold (Au) and iodine (I). XPS analysis shows the existence of iodine on the surfaces of gold nanoparticles.

Component	Binding energy (eV)
	Au	I
	4f7/2	3d5/2
Au	83.8^a	—
Au-I	83.9±0.5^b	618.3±0.5^c
AuNP@PEG	84.0	—
AuNP@I-PEG	84.1	619.3

^a,b,cThe binding energies for Au and Au-I are from [29].