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

doi:10.15541/jim20240092

Abstract

Abstract:

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 K_SV 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.

Key words: aluminum silicate fiber, PDMS, PtTFPP, flexible oxygen sensing component, superhydrophobicity

CLC Number:

TB34

ZHAO Yawen, QU Fajin, WANG Yanyi, WANG Zhiwen, CHEN Chusheng. Preparation and Properties of Aluminum Silicate Fiber Supported PtTFPP-PDMS Flexible Oxygen Sensing Components[J]. Journal of Inorganic Materials, 2024, 39(10): 1084-1090.

Figures/Tables 9

Fig. 1 Microstructure of the PtTFPP-PDMS film supported by the aluminum silicate fiber (a) SEM image of the aluminum silicate fiber; (b) SEM image of the supported PtTFPP-PDMS film; (c) EDS mappings of the supported PtTFPP-PDMS film

Fig. 2 Photo and CLSM images of the PtTFPP-PDMS film supported on the aluminum silicate fiber (a) Photo under sunlight and UV lamp; (b, c) CLSM images

Fig. 3 Water contact angle images of the samples (a) Aluminum silicate fiber; (b) Fiber-supported PtTFPP-PDMS film

Fig. 4 FT-IR spectra of aluminum silicate fiber and the supported PtTFPP-PDMS film

Fig. 5 Emission spectra and Stern-Volmer curves of the PtTFPP-PDMS film (a) Emission spectra of the PtTFPP-PDMS film in gaseous phase with oxygen concentrations of 0, 21%, 28%, 40%, 73%, and 100%; (b) Stern-Volmer plots for the gaseous oxygen; (c) Emission spectra of the PtTFPP-PDMS film in liquid water with dissolved oxygen concentrations of 0, 0.28, 0.38, 0.56, 0.72, and 0.97 mmol/L; (d) Stern-Volmer plots for the dissolved oxygen. 1 atm=1.013×105 Pa

Fig. 6 Response of the PtTFPP-PDMS film to switching between oxygen and nitrogen (a) Fluorescence intensity variation; (b) Response time; Colorful figures are available on website

Fig. 7 Effects of environments and mechanical bending on the oxygen sensitivity (I0/I100) and water contact angle of the PtTFPP-PDMS film (a) 100 ℃ steam; (b) Acidic and alkaline solutions; (c) Bending cycles

Fig. S1 XRD pattern of the aluminum silicate fiber

Fig. S2 Photo of the PtTFPP-PDMS film after bending

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