Sensing of ozone based on its quenching effect on the photoluminescence of CdSe-based core-shell quantum dots

详细信息    查看全文

• 作者：Masanori Ando ; Takuya Kamimura ; Koichi Uegaki ; Vasudevanpillai Biju…
• 关键词：Air analysis ; CdSe ; Core ; shell nanoparticles ; Non ; radiative recombination ; Quenching ; Sensor
• 刊名：Microchimica Acta
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：183
• 期：11
• 页码：3019-3024
• 全文大小：523 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Analytical Chemistry
  Inorganic Chemistry
  Physical Chemistry
  Characterization and Evaluation Materials
  Monitoring, Environmental Analysis and Environmental Ecotoxicology
  
• 出版者：Springer Wien
• ISSN：1436-5073
• 卷排序：183

文摘

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.