A capacitive flexible temperature sensor for body
temperature monitoring. The sensor is of a sandwich structure, and comprises a functional layer and two flexible encapsulation
layers arranged on two sides of the functional layer, wherein the functional layer is composed of five
composite material layers, which sequentially comprise: a flexible
electrode layer, a flexible buffer layer, a flexible temperature-sensitive layer, a flexible buffer layer and a flexible
electrode layer; and the flexible encapsulation
layers are flexible high-thermal-
conductivity waterproof insulating layers. The flexible temperature-sensitive layer is prepared by
coating a flexible temperature-sensitive material on both sides of gauze and thermocuring same, and the flexible temperature-sensitive material comprises PVDF-HFP, low-molecular-weight PEO, high-molecular-weight PEO, and H3PO4; and the flexible buffer layer is a
composite material thin film prepared by PVDF-HFP, TPU, ultra-high-molecular-weight PEO, and H3PO4. The flexible temperature sensor has characteristics of ultra-sensitivity, high response rate and high stability within a common body temperature range of a
human body, and has good practicability.