Low-temperature stretchable flexible stress sensor based on 3D printing and preparation method

The invention discloses a low-temperature stretchable flexible stress sensor based on 3D printing and a preparation method thereof, and the method comprises the steps: 1, mixing CNTs and Ag powder, and obtaining a composite conductive material with a zero temperature coefficient; 2, preparing a flexible substrate; 3, coating the flexible substrate prepared in the step 2 with the composite conductive substance obtained in the step 1, and leading out an electrode to obtain a semi-finished product of the low-temperature stretchable flexible stress sensor; and 4, packaging the semi-finished product of the low-temperature stretchable flexible stress sensor obtained in the step 3 to obtain the low-temperature stretchable flexible stress sensor based on 3D printing. According to the method, the tensile property of the flexible stress sensor is greatly improved, and the flexible stress sensor is high in stability, wide in working range, low in cost, simple in process, safer and more environmentally friendly. The prep