Effect of Postdeposition Heat Treatment on the Crystallinity, Size, and Photocatalytic Activity of TiO_𝟐 Nanoparticles Produced via Chemical Vapour Deposition

Figure 4

XRD patterns for the TiO₂ nanoparticle samples deposited at different deposition temperatures with and without heat treatment—(a) 300°C, (b) 400°C, (c) 500°C, (d) 600°C, (e) 700°C, and (f) XRD patterns for all samples deposited at different temperatures, heat treated at 400°C.

(a) sample 300°C

(b) sample 400°C

(c) sample 500°C

(d) sample 600°C

(e) samples 700°C

(f) sample heat treated at 400°C