Optical CO₂ Gas Sensing Based on TiO₂ Thin Films of Diverse Thickness Decorated with Silver Nanoparticles

Table 2

Calculated refractive indices for different deposition times of TiO₂ thin films.

Film deposition time (min)	Refractive index (at λ = 550 nm)	Film thickness (nm)	Film roughness (nm)
30	1.832	37.54	0.02
60	2.301	51.92	6.05
90	2.459	99.55	8.81