Moisture-Gated Bio-Semiconductor Electronic Tattoos for Continuous and Imperceptible On-Skin Respiratory Monitoring

Clinical Snapshot

Key Findings

• P Value: Not reported

• Effect Size: Response time: 1 second, Recovery time: 2-10 seconds

• Primary Outcome: Device performance characteristics for respiratory monitoring

• Nnt Or Sensitivity: Apnea detection capability: 10-20 second events detectable

• Confidence Interval: Not reported

Clinical Application

Early-stage technology requiring significant clinical validation before implementation Would require TGA medical device approval pathway. Potential applications in sleep medicine, respiratory medicine, and sports medicine. Cost-effectiveness assessment needed for PBS consideration if therapeutic applications emerge. Potentially applicable to patients requiring continuous respiratory monitoring, sleep apnea surveillance, and exercise physiology assessment

Abstract

Continuous respiratory monitoring remains one of the most critical yet unmet needs in personal and clinical healthcare. To overcome the limitations of cumbersome systems and motion-prone wearables, we present a moisture-gated bio-semiconductor-based electronic tattoo (BSET) that enables imperceptible, skin-conformable, and wireless respiratory monitoring by leveraging the hydration-sensitive ionic-electronic conductivity of melanin and the skin-compatibility of silk. Fabricated from a silk fibroin-melanin nanofiber bio-composite, the BSET is ultrathin at 18 μm and highly breathable, achieving a water vapor transmission rate exceeding 3000 g·m-2·d-1. By detecting exhaled moisture directly on the philtrum, the sensor exhibits a rapid response time of 1 s and a recovery time between 2 and 10 s. A direct-spun nanofiber-based wiring strategy ensures robust integration, accommodating a 10 mm displacement under 10.4 MPa of stress without failure. Driven by a compact 3 g circuit with 20 mW of power consumption, the system supports continuous wireless data transmission for over 7.3 h. During vigorous exercise and sleep, the BSET reliably monitored respiratory dynamics, identifying 10-20 s apnea events and enabling multiparameter analysis of breathing frequency and exhalation intensity. This lightweight system establishes a scalable and clinically relevant solution for continuous respiratory surveillance.

References

1. 1.Kwon, N., Jeong, T. G., Lee, H., Chang, J., Joshi, S. R., Lee, B., & Kim, S. (2026). Moisture-gated bio-semiconductor electronic tattoos for continuous and imperceptible on-skin respiratory monitoring. ACS Sensors. https://doi.org/10.1021/acssensors.6c00155