Abstract
A trifunctional flexible sensor was fabricated on a polyethylene terephthalate (PET) fiber surface. Synthesized ZnO and ZnO/V2O5 composite were coated on ZnO seed layer sputtered PET fiber. X-ray diffraction (XRD) and photoelectron spectroscopy (XPS) techniques confirmed the exact formation of ZnO and ZnO/V2O5. The fabricated ZnO/V2O5 on ZnO seeds base temperature sensor recorded better electrical properties and reversibility with a maximum temperature coefficient resistance (TCR) of 0.0111 °C−1. A calibration curve (R = 0.9941) within glucose concentration of (10 µM–10 mM) was obtained at +0.8 V vs. Ag/AgCl from current-voltage curves which assisted in calculating glucose sensitivity, limit of detection (LOD), limit of quantification (LOQ). The electrode achieved an outstanding performance of sensitivity (72.06 µAmM−1cm−2), LOD (174 µM), and LOQ (582 µM) at optimum deposition time. Interference from oxidation of interfering biomolecules such as ascorbic acid, dopamine, and uric acid were negligible compared to glucose. Finally, the fabricated electrode was employed as a pH sensor and displayed a pH sensitivity of 42.26 mV/pH (R = 0.9922). This fabricated ZnO/V2O5 electrode exhibited high sensitivity and a stable combined temperature, glucose, and pH sensor which is promising for development of multifunctional sensors in next generation wearables.
Highlights
Wearable devices have been developed and commercialized due to their broad potential and application [1]
The fabricated electrode was employed as a pH sensor and displayed a pH sensitivity of 42.26 mV/pH (R = 0.9922). This fabricated Zinc oxide (ZnO)/V2 O5 electrode exhibited high sensitivity and a stable combined temperature, glucose, and pH sensor which is promising for development of multifunctional sensors in generation wearables
Unlike the woven type which has a bundle of fibers, the polyethylene terephthalate (PET) fiber employed in our research group is the monofilament type
Summary
Wearable devices have been developed and commercialized due to their broad potential and application [1]. Electronic devices were fabricated on planar substrates such as glass and metal substrates [12]. These rigid substrate based devices deliver high performances but are not applicable as wearables because of their inflexible nature which is a major drawback [13]. The application of these various sensors to the human body requires flexible substrates with high compatibility to the human body or other surfaces [3]. Similar flexible PET fiber is employed as a substrate for a multifunctional sensor purpose
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