Fabrication of 3D TPU microfiber structures with embedded dye probes for cyanide ion sensing via charge-reversed electro jet writing

Abstract

An extremely organized sensing system that indicates the prompt indication of the cyanide ion in water was synthesized. The design of the sensing probe comprises the phenothiazine fluorophore system as an electron donor and tetramethyl-3H-indol-1-ium as an electron acceptor unit. A notable color change in daylight and UV light was observed in the probe when it comes in contact with the solution of cyanide ion. The probe interaction with the cyanide ion results in color change from purple to colorless and these changes occurs in the probe with the disconnection in the ICT process. The detection limit (LOD) 1.3 μM (UV–visible method) and 25 nM (Fluorescence method), denotes that the probe preferentially reacts with cyanide, which is less than the tolerable level of 1.9 μM. The probe reacts with cyanide ions via nucleophilic addition reaction mechanism and it is confirmed through the ¹H NMR data. Furthermore, the HRMS value also confirms the same. For practical application of the probe a 3D structure composed of TPU microfiber containing probe molecule was fabricated by charge reversed electro jet writing (CREW) method by 3D printer has been efficiently sense cyanide ion. Also, for cyanide ion sensing probe successfully determines real resources, including cyanide containing various water samples. Besides, the developed PBI-encapsulated Polysulfone (PSF) capsule kit effectively sense cyanide ion in water. Moreover, the test strips, was also employed to detect the cyanide ion in presence of competing anions. Therefore, the synthesized probe displays an outstanding sensing ability towards the cyanide ion.