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In order to improve the sensing performance of wearable sensor, broaden its application range and reduce its preparation cost, copper nanowires (Cu NWs) ink was prepared by hydrothermal method, silver nanowire (Ag NWs) ink was prepared by polyol method, and cotton textiles were successively dipped into Cu NWs ink and Ag NWs ink to prepare Cu NWs/Ag NWs/cotton textile sensor. The effect of the concentration of Ag NWs on the electrical and hydrophobic properties of the sensor was studied, and the micro-morphology of Cu NWs/Ag NWs/cotton fabric and the performance of the sensor were optimized by adjusting the impregnation-drying times. The results show that the Cu NWs/Ag NWs/cotton textile sensor has excellent hydrophobicity, and its water contact angle is up to 147°; The increase of Ag NWs concentration is beneficial to improve the conductivity of Cu NWs/Ag NWs/cotton textiles, but has little effect on their hydrophobicity; and when dipped three times, Cu NWs/Ag NWs/cotton textiles form a stable and excellent conductive network inside. The sensor has the best performance. Its sensitivity is up to 5.64 kPa-1, the detection range is 1.5~20 kPa, and the response recovery time is 300 and 200 ms respectively. It also shows regular current response to smile, fist, touch and other behaviors. The experiments show that the sensor has a good application prospect of health monitoring and underwater motion detection.

In order to improve the rheology, surface tension, density, volatility and thermal conductivity of copper composite pastes, and thus the printing performance and conductivity, the effect of water-based carrier on the properties of the pastes was studied. Deionized water was used to replace the organic solvent in the traditional slurry and a small amount of additives were added to improve the rheological properties of the carrier liquid. The formulation of the water-based paste was designed by orthogonal experiment to investigate the effect of the additives on the properties of the water-based copper composite pastes. The micro morphology and properties of copper the pastes were observed by JSM-6700F field emission scanning electron microscope (SEM), X-ray diffraction analyzer (XRD) and FT-340 four probe resistivity testers. The results show that when the optimum ratio of water-based carrier was PEG-400∶Xanthan gum∶Tween-80∶Deionized water =1.5∶0.5∶1.0∶97.0, the film is dense, the conductive network is complete, showing excellent conductivity and micro morphology; and the resistivity is as low as 2.13×10-5 Ω·m. The water-based carrier greatly improves the printing performance and conductivity of the copper composite pastes.