“…The main advantages of cellulose are its availability, biodegradability, and low price [ 4 , 5 , 6 , 7 , 8 ]. Another merit of cellulose is that it is relatively easy to process and has a high modification potential, allowing cellulose and its derivatives (film, fibers, or papers) to be endowed with new features (e.g., antibacterial, catalytic conductive, luminescent, plasmonic) [ 9 , 10 , 11 , 12 ]. This type of modified cellulosic material can be successfully used for the production of flexible wearable sensors for human health monitoring devices, as they combine the characteristics of the modifier with the flexibility, air, and moisture permeability of cellulose, which ensure high comfort of use of the sensor.…”