Resolving Cross-Sensitivity Effect in Fluorescence Quenching for Simultaneously Sensing Oxygen and Ammonia Concentrations by an Optical Dual Gas Sensor

Sensors

Ping-Tsung Huang¹  Annada Sankar Sadhu²  Moumita Deb²  Riya Karmakar²  Sajal Biring²  Yi-Nan Lin²  Cheng-Shane Chu³  Chih-Yi Liu⁴  Shih-Hsin Chang⁵  Bhola Nath Pal⁶ 

[1] Department of Chemistry, Fu Jen Catholic University, New Taipei City 24205, Taiwan;Department of Electronic Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan;Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan;Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei 10617, Taiwan;MSSCORPS CO., LTD., Hsinchu 30072, Taiwan;School of Material Science and Technology, Indian Institute of Technology (BHU), Varanasi 221005, India;

关键词: dual gas sensor;    optical gas sensor;    cross-sensitivity;    fluorescence-based sensor;    fluorescence quenching;    PtTFPP;   

DOI  :  10.3390/s21206940

来源: DOAJ

【 摘 要 】

Simultaneous sensing of multiple gases by a single fluorescent-based gas sensor is of utmost importance for practical applications. Such sensing is strongly hindered by cross-sensitivity effects. In this study, we propose a novel analysis method to ameliorate such hindrance. The trial sensor used here was fabricated by coating platinum(II) meso-tetrakis(pentafluorophenyl)porphyrin (PtTFPP) and eosin-Y dye molecules on both sides of a filter paper for sensing O₂ and NH₃ gases simultaneously. The fluorescent peak intensities of the dyes can be quenched by the analytes and this phenomenon is used to identify the gas concentrations. Ideally, each dye is only sensitive to one gas species. However, the fluorescent peak related to O₂ sensing is also quenched by NH₃ and vice versa. Such cross-sensitivity strongly hinders gas concentration detection. Therefore, we have studied this cross-sensitivity effect systematically and thus proposed a new analysis method for accurate estimation of gas concentration. Comparing with a traditional method (neglecting cross-sensitivity), this analysis improves O₂-detection error from −11.4% ± 34.3% to 2.0% ± 10.2% in a mixed background of NH₃ and N₂.

【 授权许可】

Unknown