Table 2.

H₂ sensing response of the CeO₂-Pd-PDA/rGO heterojunction nanocomposite sensor towards H₂ with different concentrations without and with UV illumination at 100 °C and 0% RH.

H2 Concentration (ppm)	200	300	400	500	600
Response (%), without UV	103	106	108	111	114
Response (%), with UV	103	107	111	115	119