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Highly sensitive thermometric methods are essential to the evaluation of nanoplatforms for thermal applications. In this study, the dual-beam thermal lens technique was introduced to assess the optically induced temperature changes in colloidal samples of gold nanoparticles. Dual-beam measurements were performed on a 0.05 mg/mL gold nanospheres (50 nm diameter) aqueous solution and the localized nanoparticle temperature were determined. The system was able to detect temperature variations as low as 10-2 °C, with 0.2 °C-1 sensitivity in the assessment of metallic nanoparticle colloids. Furthermore, thermal lens measurements also allowed the acquisition of the nanoparticle absorption cross-section value, regardless of its scattering properties.
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T. L. Pedrosa, C. Estupiñán-López, R. E. Araujo, "Dual-beam thermal lens temperature measurement of colloidal nanoparticles," Proc. SPIE 11797, Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIX, 117971W (1 August 2021); https://doi.org/10.1117/12.2593262