Abstract
In this study, we have prepared the optical fiber temperature sensor using CdSe/ZnS Quantum Dots (QDs) as sensing media. QDs have been immobilized on the surface of tapered fiber tip, and the dependence of fluorescence intensity on ambient temperature has been investigated. The surface of the optical fiber has been silanized using 3-aminopropyltriethoxysilane (APTES) which has amine functional group. QDs with carboxyl functional group have been immobilized by EDC/NHS coupling reaction. After drying with nitrogen blowing, QDs immobilization has been confirmed by photoluminescence spectroscopy (PL) and fluorescence microscope. Green, yellow, and red emission was observed depending on the size of QDs. The photoluminescence (PL) spectra were obtained with ambient temperature in the range of 25–125°C. Linear dependence of PL intensity on temperature has been observed from optical fibers where CdSe/ZnS QDs with green and yellow emission are immobilized. This shows that optical fiber temperature sensor can be fabricated using QDs as sensing media.
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