Preparation and Properties of Aluminum Silicate Fiber Supported PtTFPP-PDMS Flexible Oxygen Sensing Components

Flexible sensors have wide applications in various fields such as biomedicine,environmental monitoring and smart wearable devices,as they can adapt to diverse complex environments and curved surfaces.This study aimed to develop resilient and flexible oxygen sensors based on fluorescence quenching.A flexible oxygen sensing component was prepared,comprising aluminum silicate fibers as the support,polydimethysiloxane（PDMS） as the matrix,and platinum tetrakis pentafluorophenyl porphyrin（PtTFPP） as the oxygen probe.The component exhibited superhydrophobicity with a water contact angle of 152°,which was beneficial for maintaining integrity in humid atmospheres and aqueous solutions.It showed the fluorescence quenching effect towards gaseous oxygen and dissolved oxygen in water,which could be well fitted by the Stern-Volmer equation with KSV constants of 0.020 h·Pa-1 for the gaseous oxygen and 2.94 L·mmol-1 for the dissolved oxygen.The component also demonstrated good reversibility and fast response in rapidly altered atmosphere,with a response time of 0.9 s from nitrogen switching to oxygen and a recovery time of 2.7 s from oxygen switching to nitrogen.Additionally,the PtTFPP-PDMS component displayed remarkable stability concerning its relative fluorescence intensity and water contact angle even after exposure to 100℃ steam for 15 h,soaking in pH 1-10 aqueous solutions,and enduring 400 bending cycles.The aluminum silicate fiber-supported PtTFPP-PDMS film developed in this study exhibited excellent fluorescent oxygen sensing properties and stability,making it a promising candidate for oxygen sensors,and suitable for determination of gaseous and dissolved oxygen in challenging environments.