Nanocellulose possesses ideal biocompatibility, making it suitable as a substrate for implantable devices or sensors that come into close contact with the human body, as it can avoid causing rejection reactions during use. When flexible sensors are directly attached to the skin surface, the breathability of the material needs to be considered to prevent skin inflammation caused by poor breathability. Nanocellulose has excellent degradability, allowing it to degrade after implantation in the body, thereby avoiding the harm caused by secondary surgeries.