High-Aspect-Ratio In2–x Ga x O3 Integrated with Amorphous Al2O3 Nanofibers: All-Inorganic Self-Supporting Wearable Membranes for Ultralow-Concentration NO Sensing in Simulated Exhalation

Achieving high flexibility, breathability, and sensitivity in inorganic semiconductor gas sensors remains a substantial challenge, especially for wearable applications in high-humidity environments. This study develops a hyper-flexible, thermally stable, and highly breathable full-inorganic, self-su...

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Veröffentlicht in:Nano letters 2025-01, Vol.25 (2), p.845-853
Hauptverfasser: Liu, Yumeng, Liu, Jia, Jia, Shuangju, Yu, Qian, Zhang, Min, Lu, Hongbing, Zhang, Jinniu, Gao, Jianzhi, Zhu, Benpeng
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container_issue 2
container_start_page 845
container_title Nano letters
container_volume 25
creator Liu, Yumeng
Liu, Jia
Jia, Shuangju
Yu, Qian
Zhang, Min
Lu, Hongbing
Zhang, Jinniu
Gao, Jianzhi
Zhu, Benpeng
description Achieving high flexibility, breathability, and sensitivity in inorganic semiconductor gas sensors remains a substantial challenge, especially for wearable applications in high-humidity environments. This study develops a hyper-flexible, thermally stable, and highly breathable full-inorganic, self-supporting In2–x Ga x O3–Al2O3/Al2O3 nanofiber membrane sensor, fabricated using a dual-spinneret electrospinning method with an interlocking design. This innovative sensor has a bilayer structure with an amorphous Al2O3 nanofiber substrate layer supporting an active layer of high-aspect-ratio interwoven In2–x Ga x O3 and Al2O3 nanofibers, providing outstanding flexibility, elevated breathability, and strong thermal stability. Owing to low-concentration Ga3+ doping and its nanofiber-built self-supporting porous design, the In1.98Ga0.02O3–Al2O3/Al2O3 sensor demonstrates excellent sensitivity, selectivity, and cycling stability for detecting ultralow-concentration NO biomarker (≈15 ppb) under simulated breath conditions, without performance deterioration, even after 10000 large-angle bending cycles. This work advances the universal fabrication of high-performance, full-inorganic wearable gas sensors for breath-based diagnostic applications.
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