Abstract
Photoinduced pulsed heating of a suspension of silicon nanoparticles (NPs) excited by continuous-wave (CW) and pulsed nanosecond laser radiation was studied using Raman spectroscopy (RS). Based on the intensity ratio of the Stokes and anti-Stokes components of Raman scattering, the temperatures of the NPs and the liquid (alcohol) in the suspension were determined. It was found that silicon NPs heat up more than the surrounding liquid, which is due to their higher absorption coefficient at the excitation wavelength. Under heating by nanosecond laser pulses, the Raman method reveals strong short-term overheating of both the NPs and the surrounding liquid, but the time-average temperature of the suspension remains low. The results show that Raman spectroscopy is a convenient noncontact method for simultaneous temperature monitoring of both nanoparticles and the surrounding liquid, which is important for biomedical applications of nanoparticles, in particular in photothermal cancer therapy.
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The authors express their gratitude to A.A. Ishchenko for providing samples of nanoparticles.
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This work was supported by ongoing institutional funding. No additional grants to carry out or direct this particular research were obtained.
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Translated by V. Derbov
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Pokryshkin, N.S., Kuchumov, I.D., Yakunin, V.G. et al. Monitoring the Temperature of Silicon Nanoparticles in Liquid using Raman Scattering Excited by Nanosecond Pulsed Laser Radiation. Bull. Lebedev Phys. Inst. 50 (Suppl 10), S1163–S1168 (2023). https://doi.org/10.3103/S1068335623220098
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DOI: https://doi.org/10.3103/S1068335623220098