Abstract
An optical sensor for the dual sensing of oxygen () and carbon dioxide () based on sensing films coated on filter paper is proposed. Ethyl cellulose (EC) doped with platinum(II) meso-tetrakis(pentafluorophenyl)porphyrin (PtTFPP) and 7-amino-4-trifluoromethyl coumarin serve as the oxygen sensing material and reference blue emission dye for the pH indicator, respectively. The sensing layer includes the pH-sensitive fluorescent indicator 1-hydroxy-3,6,8-pyrenetrisulfonic acid trisodium salt immobilized within the EC. The - and -sensitive materials can both be excited with a 405 nm LED, and the two emission wavelengths can be detected separately. The experimental result reveals that the optical and sensors have sensitivities of and , respectively. The response times of the optical sensor were 15 s upon switching from nitrogen to and 41 s when moving from to nitrogen (). The response times of the optical sensor were 7 s upon switching from 100% to 100% and 39 s when moving from 100% to 100% . The proposed optical dual sensor can be used for the simultaneous sensing of and concentrations in environmental applications.
© 2017 Optical Society of America
Full Article | PDF ArticleMore Like This
Cheng-Shane Chu and Chih-Yung Chuang
Appl. Opt. 54(36) 10659-10665 (2015)
Cheng-Shane Chu and Ssu-Wei Chu
Appl. Opt. 53(32) 7657-7663 (2014)
Rispandi Mesin, Cheng-Shane Chu, and Zong-Liang Tseng
Opt. Mater. Express 13(4) 945-955 (2023)