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Temperature Sensor Based on Colloidal Quantum Dots–PMMA Nanocomposite Waveguides

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5 Author(s)
Bueno, A. ; iTEAM Research Institute, Universitat Politècnica de València, Valencia, Spain ; Suarez, I. ; Abargues, R. ; Sales, S.
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In this paper, integrated temperature sensors based on active nanocomposite planar waveguides are presented. The nanocomposites consist of cadmium selenide (CdSe) and cadmium telluride (CdTe) quantum dots (QDs) embedded in a polymethylmethacrylate (PMMA) matrix. When the samples are heated in a temperature range from 25 ^{\circ}{\rm C} to 50 ^{\circ}{\rm C} , the waveguided photoluminescence of QDs suffers from a strong intensity decrease, which is approximately quadratic dependent on temperature. Moreover, the wavelength peak of the waveguided emission spectrum of CdTe-PMMA shows a blue shift of 0.25 {\rm nm}/^{\circ}{\rm C} , whereas it remains constant in the case of CdSe-PMMA. A temperature resolution of 0.1 ^{\circ}{\rm C} is obtained. QD waveguides have great potential for the development of photonic sensors because of their integration, multiplexing, and roll-to-roll fabrication capabilities.

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Sensors Journal, IEEE  (Volume:12 ,  Issue: 10 )