Abstract
Using the temperature dependence of the fluorescence of quantum dots (QDs) in the sensing of temperature is a promising field. In this work, we systematically study the effect of cyclic heating and cooling on the fluorescence of CdSe/ZnS QD and PMMA-QD composite in air. The experimental results show that increasing the temperature causes red-shift of the PL (photoluminescence) emission peak and the decrease of the PL intensity, and decreasing the temperature causes blue-shift of the PL emission peak and the increase of the PL intensity for all the QDs presented in both media. There exists a critical temperature, above which the heating completely damages the surface structures of the QDs and leads to the loss of the luminescence characteristics of the QDs. Placing CdSe/ZnS QDs in PMMA causes blue-shift of the PL emission peak, which likely is due to the shift of the ground state energy of the QDs. The heating-cooling cycle with high peak temperature up to 310 °C does not change the crystal structure of the ZnS in the CdSe/ZnS QDs.
Original language | English |
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Article number | 185 |
Journal | Journal of Nanoparticle Research |
Volume | 21 |
Issue number | 8 |
DOIs | |
State | Published - Aug 1 2019 |
Bibliographical note
Funding Information:W Luan is grateful for the financial support from the National Natural Science Fund of China (51475166).
Publisher Copyright:
© 2019, Springer Nature B.V.
Keywords
- Heating-cooling
- Irreversibility
- PL intensity
- QDs
- Temperature sensor
- Wavelength
ASJC Scopus subject areas
- Bioengineering
- Atomic and Molecular Physics, and Optics
- Chemistry (all)
- Modeling and Simulation
- Materials Science (all)
- Condensed Matter Physics