Abstract
We report photoluminescence-based ozone sensing using composite films composed of gold or platinum and red-emitting CdSe/ZnS core-shell quantum dots. The sensing efficiency of quantum dots is enhanced by the addition of noble metals. The composite films undergo reversible changes in photoluminescence intensity (measured at excitation/emission wavelengths of 365/652–659 nm) in the presence of ppm levels of ozone in air at 25°C and at atmospheric pressure. The sensitivity of the composite films does not saturate with ozone in the 0.5–200 ppm concentration range. When compared with a quantum dot-only film, the composite films show higher sensitivities to 0.5 ppm ozone of 27% (gold) and 43% (platinum). When compared with a quantum dot-only film, the photoluminescence of the gold- or platinum-palladium alloy-based film recovers faster after the removal of ozone in the surrounding atmosphere. Thus, platinum- or gold-conjugated quantum-dot films form sensor modules for the reversible and highly sensitive detection of ozone under the tested ambient conditions.
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Acknowledgments
This work was supported in part by JSPS KAKENHI Grant Numbers 26410201 and 17K05957 (to M. A. and Y. S.), JSPS KAKENHI Grant Number 17H05243 (to V. B.), and Grant (#4: 38th and #1: 39th) from the Steel Foundation for Environmental Protection Technology (to Y. S. and M. A.). We are also grateful to Dr. Leslie Sargent Jones (Appalachian State University, Retired) for her careful reading of our manuscript.
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Ando, M., Inagaki, K., Kawasaki, H. et al. Photoluminescent Ozone Sensor with Enhanced Sensitivity by Using CdSe/ZnS Quantum Dots Modified with Gold and Platinum. ANAL. SCI. 36, 989–995 (2020). https://doi.org/10.2116/analsci.19P490
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DOI: https://doi.org/10.2116/analsci.19P490