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Multilayer sol–gel membranes for optical sensing applications: single layer pH and dual layer CO2 and NH3 sensors

Materials ScienceChemical EngineeringOptical MaterialsEngineeringNanomaterialsMultilayer Sol–gel MembranesMembrane CharacterizationSingle Layer PhChemistryDual Layer Co2Porous SensorOptical SensorsSol-gel Synthesis