Hassan B. Albargi ¹ Abdul Qayoom ² Zubair Khaliq ^2* Muhammad Bilal Qadir ^2* Mumtaz Ali ^2* Usama Khalid ^2* Mohd Faisal ^1* Ali S. Alkorbi ^1* Mohammed Jalalah ¹ Farid A. Harraz ^1*

• ¹ Najran University, Najran, Saudi Arabia
• ² National Textile University, Faisalabad, Punjab, Pakistan

Recent advancements in wearable sensor technology have led to a demand for materials and designs that offer enhanced sensitivity, flexibility, and stability. In response, we present a groundbreaking development of a novel piezoresistive strain sensor. This sensor uniquely uses graphene/siloxane composite conductive ink applied to plied auxetic yarn (PAY). The sensor's design focuses on a braided structure consisting of a core-spun blend of lycra and cotton yarns, responsible for the sensor's auxetic characteristics. Incorporating a siloxane polymer resin coating greatly enhances the mechanical durability and longevity of the yarn. While the use of a conductive graphene ink maximizes the electrical characteristics of the sensor. The innovative combination increases the negative Poisson’s ratio of the material and facilitates a substantial enhancement of two and half times in sensitivity and five times in strain range, making it highly suitable for integration into flexible, textile-based wearable technologies. The piezoresistive strain sensors (PSS) developed in this study demonstrate a marked improvement in performance with the ability to translate mechanical strain into measurable electrical resistance changes efficiently. This breakthrough offers exciting potential applications in health monitoring and structural diagnostics, inspiring a new era of sensor technology.