A novel optical dual sensor based on a coaxial electrospinning method for simultaneous sensing of oxygen and ammonia

The coaxial electrospinning method is widely used in a wide range of applications, including medical devices and sensing technology. This study proposes a novel optical dual sensor for simultaneous detection of oxygen (O₂) and ammonia (NH₃) based on coaxial electrospinning method to produce core-shell fiber membrane doped fluorescent dyes. The O₂ (core) and NH₃ (shell) sensitive dye membranes were successfully fabricated using coaxial electrospinning method by dissolving a polymer matrix, cellulose acetate (CA), with platinum (II) meso-tetrakis (pentafluorophenyl) porphyrin (PtTFPP) and Eosin-Y, respectively. The optical dual sensor was illuminated by an UV LED to monitor the intensity change and wavelength shift in the presence of selected analyte gases. The experimental data show that the sensitivities of optical dual sensor were found to be 6.4 and 3.2 for O₂ and NH₃, respectively. The response and recovery times of O₂ and NH₃ sensing probes were measured to be 12 s/29 s and 65 s/66 s, respectively. Also, when exposed to NH₃ gas gradually from 0 to 500 ppm, the wavelength shift data of Eosin-Y was started at 569.5 nm, 573.9 nm, 578.4 nm, 579.4 nm, 580.8 nm, and 582.2 nm, respectively. In applications, the proposed optical dual sensor based on coaxial electrospinning method can detect O₂ and NH₃ gases simultaneously.