Quantum-dots based materials for temperature sensing: effect of cyclic heating-cooling on fluorescence

Ying Chen, Weiling Luan, Shaofu Zhang, Fuqian Yang

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

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 languageEnglish
Article number185
JournalJournal of Nanoparticle Research
Volume21
Issue number8
DOIs
StatePublished - Aug 1 2019

Bibliographical note

Publisher Copyright:
© 2019, Springer Nature B.V.

Funding

W Luan is grateful for the financial support from the National Natural Science Fund of China (51475166).

FundersFunder number
National Natural Science Foundation of China-Yunnan Joint Fund51475166
Natural Science Foundation of Shanghai

    Keywords

    • Heating-cooling
    • Irreversibility
    • PL intensity
    • QDs
    • Temperature sensor
    • Wavelength

    ASJC Scopus subject areas

    • Bioengineering
    • Atomic and Molecular Physics, and Optics
    • General Chemistry
    • Modeling and Simulation
    • General Materials Science
    • Condensed Matter Physics

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