Characterization of laser-induced emission of high-purity TiO2 nanoparticles: feasibility of laser-induced incandescence

• Published in: Applied physics. B, Lasers and optics Lasers and optics, 2023-06, Vol.129 (6)
• Main Authors: Yi, Junghwa, Betrancourt, Christopher, Darabiha, Nasser, Franzelli, Benedetta
• Format: Article
• Language: English
• Subjects: Applied physics; Carbon; Carbon black; Doppler effect; Emission analysis; Engineering; Engineering Sciences; Feasibility; Fluence; Laser induced breakdown spectroscopy; Laser induced incandescence; Lasers; Materials; Metal oxides; Nanoparticles; Optical Devices; Optics; Photonics; Physical Chemistry; Physics; Physics and Astronomy; Purity; Quantum Optics; Reactive environments; Reactive fluid environment; Red shift; Time measurement; Titanium; Titanium dioxide
• ISSN: 0946-2171; 1432-0649
• DOI: 10.1007/s00340-023-08038-3

The development of laser-induced incandescence (LII) approach for characterizing the production of high-purity non-carbonaceous metal oxides produced in flame synthesis systems is in progress. This work aims to prove the feasibility of LII measurement for titanium dioxide (TiO 2 ). In previous works, laser-induced emission (LIE) was investigated for flame-synthetized TiO 2 particles. However, the presence of carbon materials was detected. As this calls into question the nature of the signal, we consider in this work LIE of high-purity engineered TiO 2 nanoparticles to circumvent the carbon issue. Specifically, we investigate the spectral and temporal laser-induced emissions of pure TiO 2 nanoparticles dispersed in a non-reactive environment. In parallel, LIE from carbon black is examined to validate the strategy and highlight differences between carbon black and TiO 2 . The TiO 2 results indicate that depending on the laser fluence, different prompt interferences appear. The literature suggests that these non-thermal emissions are likely to be from fluorescence or phase-selective laser-induced breakdown spectroscopy, both characterized by a short lifetime. To avoid these parasitic signals, measurement acquisition time is delayed. A spectral red-shift is observed with time as a result of decreasing particle temperature. This proves the LII nature of delayed emission from pure TiO 2 , which is confirmed by the LII-like nature of the temporal signals.