University of Guilan Caspian Journal of Environmental Sciences 1735-3033 22 1 2024 01 01 Applications of oxygen sensors using smart membranes incorporating polymerized 2,6-dichloroindophenol as a novel method for preventing food spoilage 147 154 7299 10.22124/cjes.2023.7299 EN Tannaz Hasani Department of Chemical Engineering, Damghan Branch, Islamic Azad University, Damghan, Iran Hamid Hashemi-Moghaddam Department of Chemistry, Damghan Branch, Islamic Azad University, Damghan, Iran Behrouz Akbari-Adergani Ministry of Health and Medical Education, Food and Drug Organization, Iran Journal Article 2023 11 27 Monitoring molecular oxygen concentrations is critical for many applications, yet developing robust and cost-effective colorimetric sensors capable of detecting color changes remains a longstanding challenge. The current work exhibits the development of an optical oxygen sensor using a smartphone and a sensitive membrane. Radical polymerization was used to coat the surface of silica nanoparticles with a 2,6-dichloroindophenol molecularly imprinted polymer using methacrylic acid, ethylene glycol dimethacrylate, and 2,2′-azobisisobutyronitrile as the functional monomer, cross-linker, and initiator, respectively. After characterizing the imprinted polymers with FTIR, SEM, and XRD, this nanocomposite was impregnated into a PVDF membrane, which changes color when exposed to oxygen. A smartphone's camera was used to identify the color changes using RGB profiling, and this standalone sensor demonstrated good sensitivity.  An increasing calibration curve with a linear detection range of 4.79-40 KPa was found by calibrating oxygen samples with slopes for R + G + B pixels. This sensor's suitability for use in food packaging was investigated. The fabricated sensor is very low-cost, easy to use, and can potentially be used in various industries for inexpensive oxygen detection. https://cjes.guilan.ac.ir/article_7299_f08d50dde2f9efa85c32a918e43b85bb.pdf