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.

我们报告了基于光致发光的臭氧传感，使用由金或铂和发红光的 CdSe/ZnS 核壳量子点组成的复合膜。通过添加贵金属可以提高量子点的传感效率。在 25°C 和大气压下，在空气中存在 ppm 级臭氧的情况下，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。复合膜的灵敏度不会因浓度范围为 0.5 – 200 ppm 的臭氧而饱和。与纯量子点薄膜相比，复合薄膜对 0.5 ppm 臭氧的灵敏度更高，分别为 27%（金）和 43%（铂）。与纯量子点薄膜相比，金基或铂钯合金基薄膜的光致发光在周围大气中的臭氧被去除后恢复得更快。因此，铂或金共轭量子点薄膜形成传感器模块，用于在测试环境条件下可逆且高灵敏度地检测臭氧。