A wireless epidermal biosensing wristband based on monolithic fabric integration was developed

Recently, the research group of Lin Yuanjing, assistant professor of the Shenzhen-Hong Kong School of Microelectronics of Southern University of Science and Technology, and the research group of Zheng Zijian, professor of the Hong Kong Polytechnic University, have made research progress in the field of flexible wearable sensor devices, and the related research has been published in Science Advances.

Sweat contains many biomarkers, including electrolytes, metabolites, amino acids, and hormones, and continuous monitoring of these biomarkers can help enable early disease detection and management. Electronic fabrics have great potential in sweat biosensing due to their unique comfort and breathability. However, due to the large inherent resistance of the fabric and the low degree of electronic integration, the existing methods usually only integrate the sensor on the fabric, which cannot achieve the high-compatibility integrated interconnection of the entire electronic system.

Polymer-assisted metal deposition (PAMD) is a low-cost, high-yield process that can be used to fabricate highly conductive textiles, providing a new idea for fabricing electronic fabric systems for flexible sensing.

In this study, the research team proposed a hybrid bracelet integrated on a single-layer fabric for real-time wireless detection of biomarkers in sweat, and achieved the same circuit pattern on the single-layer fabric as a traditional printed circuit board through the PAMD process and improved double-sided lithography technology. Based on a specially designed circuit pattern, the research team fabricated the bracelet consisting of three parts: a highly selective sensor for ion detection, a circuit for signal extraction and processing, and a Bluetooth module and application software for wireless data transmission. The integrated bracelet continuously monitors sweat potassium concentrations from 0.3 to 40 mm, enabling reliable wireless real-time epidermal biosensing.

In addition, the bracelet has excellent air and moisture permeability, which is more than an order of magnitude higher than the elastomers commonly used in commercial medical tapes and flexible electronics, ensuring a comfortable fit. This work has great potential as a unique strategy for manufacturing wearable e-fabrics in areas such as mobile health and telemedicine. (Source: Diao Wenhui, China Science News)

Related Paper Information:

Use the bracelet for on-site sweat monitoring during exercise Courtesy of the scientific research team

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