Ando Masanori, Inagaki Kosuke, Kawasaki Hideya, Biju Vasudevanpillai, Shigeri Yasushi
Biomedical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), 1-8-31 Midorigaoka Ikeda, Osaka, 563-8577, Japan.
Faculty of Chemistry, Materials and Bioengineering, Kansai University, 3-3-35 Yamate-cho, Suita, Osaka, 564-8680, Japan.
Anal Sci. 2020 Aug 10;36(8):989-995. doi: 10.2116/analsci.19P490. Epub 2020 Mar 13.
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.
我们报道了基于光致发光的臭氧传感，该传感使用由金或铂与发红光的CdSe/ZnS核壳量子点组成的复合薄膜。通过添加贵金属提高了量子点的传感效率。在25°C和大气压下，当空气中存在ppm级的臭氧时，复合薄膜的光致发光强度（在365/652 - 659 nm的激发/发射波长下测量）会发生可逆变化。复合薄膜在0.5 - 200 ppm浓度范围内对臭氧的灵敏度不会饱和。与仅量子点薄膜相比，复合薄膜对0.5 ppm臭氧的灵敏度更高，金复合薄膜高27%，铂复合薄膜高43%。与仅量子点薄膜相比，基于金或铂 - 钯合金的薄膜在周围大气中的臭氧去除后，光致发光恢复得更快。因此，铂或金共轭量子点薄膜形成了在测试环境条件下用于可逆且高灵敏度检测臭氧的传感器模块。
