Temperature evaluation of colloidal nanoparticles by the thermal lens technique
Abstract
The use of highly sensitive thermometric methods is essential for the evaluation of nanoplatforms for photothermal therapy. In this study, the thermal lens technique was introduced to assess the optically induced temperature changes in colloidal samples of gold nanoparticles. Thermal lens measurements also allowed the acquisition of the nanoparticle absorption cross-section value, regardless of knowing the nanostructure scattering properties. The developed thermometric system exhibited 0.2 °C−1 sensitivity and was capable of measuring temperature variations of metallic colloidal samples with a resolution of 0.01 °C. Measuring colloidal temperature changes allows for the estimation of the localized temperature variation reached by each nanoheater, before thermalization of the excitation volume. Our results establish a practical and effective method to evaluate optically induced temperature changes on metallic colloids.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Oct 05, 2020
- Source ID
- 10.1364/oe.405172
Entities
People
- C. Estupiñán-lópez
- Renato De Araujo
- T. L. Pedrosa
Organizations
- Coordenação de Aperfeicoamento de Pessoal de Nível Superior
- Fundação de Amparo à Ciência e Tecnologia de Pernambuco
- National Council for Scientific and Technological Development
- Office of Naval Research Global