Flexible temperature Sensor based on PDMS/CNT/Ti3C2TX for physiological temperature monitoring

The flexible temperature sensor for physiological temperature monitoring based on polydimethylsiloxane/carbon nanotubes/Ti3C2Tx (PDMS/CNT/Ti3C2TX) was prepared. The thermosensitive layer was made by filling different proportions of grind Ti3C2Tx into PDMS/CNT (PC). PDMS thermal expansion and the thermal properties of the conductive network inside dominated the sensor performance. The experimental results showed that the sensitivity of PDMS/CNT/Ti3C2Tx temperature sensor (PCT-TS) decreased by 50% compared with PDMS/CNT10%, (PC10) when the mass of Ti3C2Tx was 10%, and the resistance still showed a negative temperature coefficient. However, the temperature coefficient reversed by further increasing the Ti3CTx mass to 30%. The sensitivity of Ti3C2Tx was greatly improved by approximately 3 times better than PC10. After that, excessive Ti3C2Tx only increased the density of the conductive path, which inhibited the deformation of the internal conductive network and the flexibility of the material. PCT-TS has the advantages of adjustable temperature coefficients, high sensitivity, and simple manufacturing methods, which are expected to be applied in human medicine and health detection.