In this project, a wearable integrated sensor was developed with the capability to detect muscle activities and body temperature. The components of the pressure sensor, comprising the dielectric layer, substrate, and electrode materials, were manufactured using biomass-sourced, biodegradable, and flexible materials. Specifically, pectin aerogel, carbonized cellulose aerogel particles, and cellulose were employed as the dielectric layer, electrode material, and substrate, respectively. This innovative approach aimed to replace non-biodegradable materials with environmentally friendly alternatives, addressing concerns related to environmental pollution. The sensor exhibited remarkable properties, including a wide range of pressure sensing (10 Pa - 500 kPa), a sensitivity of 300 MPa-1 in the subtle pressure regime, dynamic durability over 10,000 cycles, rapid response time (98 ms), and swift recovery time (164 ms). Additionally, the sensor demonstrated effective performance in sensing joint activities such as knee, elbow, and finger bending, as well as muscle activities like smiling, swallowing, and bicep contraction. Moreover, a temperature sensor was fabricated using inkjet printing of silver interdigitated electrodes on a flexible cellulose substrate, followed by blade coating of functional materials such as Mxenes, carbon nanotubes (CNTs), and graphene. The temperature sensor exhibited desirable properties, including an application range of 20-100 oC, a sensitivity of 1%/oC, a response time of 100 ms, a recovery time of 150 ms, dynamic durability of 100 cycles, and effective temperature mapping capabilities with a 3x3 sensor matrix. Furthermore, the integration of the pressure and temperature sensors resulted in the creation of an integrated wearable sensor, which was effectively utilized for human motion detection and body temperature measurement.
