Scalable fabrication of free-standing, stretchable CNT/TPE ultrathin composite films for skin adhesive epidermal electronics

Wearable electronics have drawn extensive interest on account of their potential applications in smart human-machine interfaces, wearable human-health monitors and mimicking biological organs. However, the scalable and cost-effective fabrication of self-adhesive and easily transferred flexible ultrathin films is still challenging. Herein, a simple and highly efficient strategy was proposed for an ultrathin, self-standing and self-adhesive macroscopic CNT/TPE hybrid film at the air/water interface. Due to its distinctive ultrathin feature, the obtained film can be directly attached to the skin surface for real-time human physiological behaviour detection. Additionally, the free-standing hybrid film can be employed for the effective detection of tiny airflow changes and even acoustic vibration.