{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,6]],"date-time":"2026-02-06T21:29:18Z","timestamp":1770413358952,"version":"3.49.0"},"reference-count":41,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2017,6,7]],"date-time":"2017-06-07T00:00:00Z","timestamp":1496793600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This paper presents a simple, high resolution imaging approach utilizing ratiometric planar optode for simultaneous measurement of dissolved oxygen (DO) and pH. The planar optode comprises a plastic optical film coated with oxygen indicator Platinum(II) octaethylporphyrin (PtOEP) and reference quantum dots (QDs) embedded in polystyrene (PS), pH indicator 5-Hexadecanoylamino-fluorescein (5-Fluorescein) embedded in Hydromed D4 matrix. The indicator and reference dyes are excited by utilizing an LED (Light Emitting Diode) source with a central wavelength of 405 nm, the emission respectively matches the different channels (red, green, and blue) of a 3CCD camera after eliminating the excitation source by utilizing the color filter. The result shows that there is low cross-sensitivity between the two analytes dissolved oxygen and pH, and it shows good performance in the dynamic response ranges of 0\u201312 mg\/L and a dynamic range of pH 6\u22128. The optode has been tested with regard to the response times, accuracy, photostability and stability. The applied experiment for detecting pH\/Oxygen of sea-water under the influence of the rain drops is demonstrated. It is shown that the planar optode measuring system provides a simple method with low cross-talk for pH\/Oxygen imaging in aqueous applications.<\/jats:p>","DOI":"10.3390\/s17061316","type":"journal-article","created":{"date-parts":[[2017,6,7]],"date-time":"2017-06-07T10:01:20Z","timestamp":1496829680000},"page":"1316","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":23,"title":["Design and Fabrication of a Ratiometric Planar Optode for Simultaneous Imaging of pH and Oxygen"],"prefix":"10.3390","volume":"17","author":[{"given":"Zike","family":"Jiang","sequence":"first","affiliation":[{"name":"Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-4216-2222","authenticated-orcid":false,"given":"Xinsheng","family":"Yu","sequence":"additional","affiliation":[{"name":"Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China"}]},{"given":"Yingyan","family":"Hao","sequence":"additional","affiliation":[{"name":"Key Lab of Submarine Geosciences and Prospecting Techniques, Ministry of Education, College of Marine Geosciences, Ocean University of China, Qingdao 266100, China"}]}],"member":"1968","published-online":{"date-parts":[[2017,6,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"723","DOI":"10.4319\/lo.2009.54.3.0723","article-title":"In situ microscale variation in distribution and consumption of O2: A case study from a deep ocean margin sediment (Sagami Bay, Japan)","volume":"54","author":"Glud","year":"2009","journal-title":"Limnol. 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