Facile fabrication of rGO/LIG-based temperature sensor with high sensitivity

[Display omitted] •LIG electrodes are prepared using the low-cost, one-step and large-scale fabrication.•rGO and LIG show a negative temperature coefficient of resistance.•rGO can be adsorbed on LIG well and can protect the LIG from peeling off.•The proposed graphene-based temperature sensor shows good sensing capability. In this work, a highly sensitive graphene-based temperature sensor is proposed, which is composed of reduced graphene oxide (rGO) as a temperature-sensitive layer and laser-induced graphene (LIG) as the flexible interdigital electrodes. Benefiting from the negative temperature coefficient of resistance (TCR) of both rGO and LIG, the rGO/LIG-based temperature sensor exhibits a high sensitivity of 1.56% °C−1 over a range of 25–45 °C with a resolution of 0.2 °C. Moreover, LIG is helpful for the large-scale preparation of the graphene-based temperature sensor and reducing the cost of fabrication. The graphene-based temperature sensor will demonstrate potential applications in health monitoring, such as skin temperature.