Proceedings of MATSUS Spring 2025 Conference (MATSUSSpring25)
DOI: https://doi.org/10.29363/nanoge.matsusspring.2025.110
Publication date: 16th December 2024
Fluorescent nanothermometers are nanoscale materials that posses temperature dependent specrtoscopic properties. These nanostructures are expected to revolutionize research of cell functions and provide strategies for early diagnostics if nontoxic, stable materials allowing for accurate and precise temperature measurement can be fabricated. In this work, we study temperature-dependent photoluminescence (PL) properties of CuInS2/ZnS core/shell colloidal quantum dots (QDs) encapsulated in micelles for solubility in aqueous environments. We demonstrate four properties that can be used for temperature readout: (i) intensity quenching, (ii) PL decay acceleration, (iii) peak energy shift, and (iv) change in the excitation efficency ratio. We explain the physical mechanisms responsible for the four modes and demonstrate single mode nanothermometer performance. Crucially, using multiple linear regression (MLR), we combine the four modes into a single multiparameter readout mode. We unambiguously demonstrate that the MLR mode significantly boosts the nanothermometer performance. Namely, the sensitivities are increased by up to a factor of 7, while the precision is improved by a factor of 3. We discuss the implications of these results to other nanothermometer materials. Our results show that CuInS2/ZnS QDs are excellent nanomaterials for intracellular in vivo thermometry and provide guidelines for further optimization of their performance.
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