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Bi-functional heater-thermometer Nd3+-doped nanoparticles with multiple temperature sensing parameters.

Nanotechnology 2019 January 10
Achieving a combination of real-time diagnosis and therapy in a single platform with sensitive thermometry and efficient heat production is a crucial step towards controllable photo-thermal therapy. Here, Nd3+-doped Y2O3 nanoparticles prepared by combined Pechini-foaming technique operating in first and second biological windows were demonstrated as thermal sensors within wide temperature range of 123-873 K and heaters with temperature increase by 100 K. Thermal sensing was performed based on various approaches: luminescence intensity ratio (electronic levels; Stark sublevels), spectral line position and line bandwidth were used as temperature dependent parameters. Applicability of regarded sensing parameters along with relative thermal sensitivity and temperature resolution were discussed and compared. Influence of Nd3+ doping concentration on thermometer and heater efficiency was also investigated.

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