A cyclic freezing-thawing approach to layered Janus hydrogel tapes with single-sided adhesiveness for wearable strain sensors

•A cyclic freezing-thawing approach to layered Janus hydrogel tapes with single-sided adhesiveness is developed.•The interfacial peeling force of the Janus hydrogel tapes reaches 114.6 N/m.•Strain sensors of Janus hydrogel tapes achieve a GF of 3.4.•Wireless wearable sensors based on Bluetooth signal transmission system are demonstrated.