Department of Mechanical Engineering, Ming Chi University of Technology, Taishan Dist., New Taipei City 243303, Taiwan.
Research Center for Intelligent Medical Device, Ming Chi University of Technology, Taishan Dist., New Taipei City 243303, Taiwan.
Sensors (Basel). 2021 Jun 12;21(12):4057. doi: 10.3390/s21124057.
Simultaneous detection of carbon dioxide (CO) and oxygen (O) has attracted considerable interest since CO and O play key roles in various industrial and domestic applications. In this study, a new approach based on a fluorescence ratiometric referencing method was reported to develop an optical dual sensor where platinum (II) meso-tetrakis(pentafluorophenyl)porphyrin (PtTFPP) complex used as the O-sensitive dye, CdSe/ZnS quantum dots (QDs) combined with phenol red used as the CO-sensitive dye, and CdSe/ZnS QDs used as the reference dye for the simultaneous detection of O and CO. All the dyes were immobilized in a gas-permeable matrix poly (isobutyl methacrylate) (PolyIBM) and subjected to excitation using a 380 nm LED. The as-obtained distinct fluorescence spectral intensities were alternately exposed to analyte gases to observe changes in the fluorescence intensity. In the presence of O, the fluorescence intensity of the Pt (II) complex was considerably quenched, while in the presence of CO, the fluorescence intensity of QDs was increased. The corresponding ratiometric sensitivities of the optical dual sensor for O and CO were approximately 13 and 144, respectively. In addition, the response and recovery for O and CO were calculated to be 10 s/35 s and 20 s/60 s, respectively. Thus, a ratiometric optical dual gas sensor for the simultaneous detection of O and CO was successfully developed. Effects of spurious fluctuations in the intensity of external and excitation sources were suppressed by the ratiometric sensing approach.
同时检测二氧化碳（CO）和氧气（O）自 CO 和 O 在各种工业和家庭应用中发挥关键作用以来，引起了相当大的兴趣。在这项研究中，报道了一种基于荧光比率参考法的新方法，用于开发一种光学双传感器，其中铂（II）中四（五氟苯基）卟啉（PtTFPP）复合物用作 O 敏染料，CdSe/ZnS 量子点（QDs）与苯酚红结合用作 CO 敏染料，CdSe/ZnS QDs 用作 O 和 CO 同时检测的参考染料。所有染料都固定在透气基质聚（异丁基甲基丙烯酸酯）（PolyIBM）中，并使用 380nm LED 进行激发。获得的独特荧光光谱强度被交替暴露于分析物气体，以观察荧光强度的变化。在存在 O 的情况下，Pt（II）配合物的荧光强度大大猝灭，而在存在 CO 的情况下，QDs 的荧光强度增加。光学双传感器对 O 和 CO 的相应比率灵敏度分别约为 13 和 144。此外，计算出 O 和 CO 的响应和恢复时间分别为 10 s/35 s 和 20 s/60 s。因此，成功开发了用于同时检测 O 和 CO 的比率光学双气敏传感器。通过比率传感方法抑制了外部和激发源强度的杂散波动的影响。
