Table 1. Comparison with other previously reported immunosensors for the detection of CEA.

Materials	Detection ranges (ng/mL)	Detection limits (ng/mL)	References
CS–CNTs–GNPs nanocomposite film	0.1–2.0	0.04	26
[Ag–Ag2O]/SiO2 nanocomposite material	0.5–160	0.14	27
Thi@NPG/AuNPs	0.01–100	0.003	28
AuNP@nafion/FC@CHIT	0.01–150	0.0031	29
HRP-anti-CEA-NGGN	0.05–350	0.01	30
Carboxylated g-C3N4/TiO2 nanosheets	0.01–10	0.0021	This work