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Sensing of ozone based on its quenching effect on the photoluminescence of CdSe-based core-shell quantum dots
被引:8
|作者:
Ando, Masanori
[1
]
Kamimura, Takuya
[1
]
Uegaki, Koichi
[1
]
Biju, Vasudevanpillai
[2
]
Shigeri, Yasushi
[3
]
机构:
[1] Natl Inst Adv Ind Sci & Technol, Biomed Res Inst, 1-8-31 Midorigaoka, Ikeda, Osaka 5638577, Japan
[2] Hokkaido Univ, Res Inst Elect Sci, N20W10, Sapporo, Hokkaido N20W10, Japan
[3] Natl Inst Adv Ind Sci & Technol, Hlth Res Inst, 1-8-31 Midorigaoka, Ikeda, Osaka 5638577, Japan
关键词:
Air analysis;
CdSe;
Core-shell nanoparticles;
Non-radiative recombination;
Quenching;
Sensor;
CDTE NANOCRYSTALS;
LUMINESCENCE;
SENSORS;
D O I:
10.1007/s00604-016-1938-9
中图分类号:
O65 [分析化学];
学科分类号:
070302 ;
081704 ;
摘要:
Thin films of CdSe-based core-shell type quantum dots (CdSe/CdZnS, CdSe/ZnS and CdSeTe/ZnS) deposited on glass substrate were found to undergo a reversible change in photoluminescence (PL) on exposure to ozone in concentrations as low as 0.1 ppm in air. PL decreased rapidly on adding ozone and fully recovered after changing back to pure air. The PL of the CdSe/ZnS quantum dots (QDs) was not quenched by pure oxygen, nitrogen, argon, carbon dioxide, and air containing hydrogen. A comparison of various CdSe-based core-shell type QDs with different emission colors showed that green-emitting QDs with smaller size were more sensitive to ozone, while red-emitting QDs (of larger size) were more resistant to high concentrations of ozone. The response time of the sensor (for a 90 % signal change) was in the order of 10-20 min. The reversible, reproducible and selective response to ozone at room temperature under atmospheric pressure suggested that these QDs have a great potential in terms of fluorescent sensing of ozone.
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页码:3019 / 3024
页数:6
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