Among various techniques for monitoring of particle formation in flames, laser-induced incandescence (LII) has generally been developed for soot particles. Recent works have shown the feasibility of LII for flame-synthesized TiO 2. However, extensive work is still needed to use this technique to quantitatively characterize TiO 2 production in flames. In this work, first attempts towards the characterization of TiO 2 synthesis in flames are provided in terms of normalized volume fraction and primary particle diameter. To achieve this, TiO 2 nanoparticles are generated in a laminar diffusion flame of argon-diluted hydrogen and air with pre-vaporized Ti-precursor. A 355 nm laser is used to irradiate the flame-generated particles, and spectral, temporal and spatial measurements are performed. First, laser-induced emission at prompt is investigated for different laser fluences to identify the operating conditions that ensure the LII-like nature of the measured signals and infer the composition of the produced nanoparticles. Then, it is shown that it is possible to obtain information from the LII signal on the spatial evolution of the normalized volume fraction and the primary particle size.