Piezoelectret Textile Dressing for Biosignal Monitored Wound Healing

In recent years, smart textile sensors have gained exponential growth in various sectors such as wearable technology and healthcare. However, addressing the demand for wearable textiles that offer both exceptional functionality (e.g., air-permeability, flexibility) and comfort remains a significant challenge. In this context, a rotary jet-spun textile piezoelectret is demonstrated, which is not reported so far. The piezoelectric output of the all-organic textile sensor is improved by 150% in voltage and 200% for current upon electrical poling. The finite element method revealed that the enhanced piezo-potential is attributed to the trapped polarized charges within the piezoelectret matrix. It exhibited outstanding piezoelectric properties with sensitivity of 400 mV kPa^-1 (pressure range, 0.6-7 kPa), waterproofness (water contact angle ≈134°) and high breathability (10 kg m^-2 per day), ensuring wearer comfort. Apart from monitoring different physiological signals such as pulse and respiratory rate, it also acted as a sensor array that displays the deep learning-aided pressure mapping with the accuracy of 98%. In addition, this textile accelerated faster proliferation and migration of L929 cell due to its piezoelectricity induced electrical stimulation, suggesting its potential application in wound dressings. Thus, this approach has huge potential to offer a scalable and versatile solution for biomedical technology.