基于ZnO复合材料的芯片式pH和温度传感器

Chip Sensor for pH and Temperature Monitoring Based on ZnO Composite

可穿戴传感器可以方便地监测汗液pH、体表温度等信号,以此判断人体的健康状况,因而吸引了广泛注意。本研究制备了一种用于检测人体皮肤表面温度及汗液pH的芯片式传感器。pH传感器为ZnO/聚苯胺(PAni)微纳米结构,在不同pH溶液中的表面电位不同,灵敏度达120mV/pH。温度传感器为ZnO/还原氧化石墨烯(rGO)复合材料,用简单的滴落涂布法在聚对苯二甲酸乙二醇酯/氧化铟锡(PET/ITO)导电电极表面修饰一层ZnO/rGO。随着温度的升高, ZnO/rGO复合材料的电阻下降,其电阻变化量的灵敏度达–0.67%/℃。两种传感材料可以集成在一个微小的芯片上,获得的多功能传感器表现出较高的稳定性,在皮肤表面pH和温度检测方面具有潜在的应用价值。

Wearable sensors which can evaluate the health status of the human body by conveniently monitoring human’s pH of sweat and body temperature have attracted wide attention. Here, sensors for sweat pH and skin temperature monitoring were developed. ZnO/polyaniline(PAni) micro-nano structure which sensitivity reaches 120 mV/pH realized pH sensing by monitoring the change of surface potential in solutions under different pH conditions. A layer of ZnO/rGO on surface of polyethylene glycol terephthalate/indium tin oxid(PET/ITO) was constructed for temperature monitoring by a simple drop-casting method. With the temperature increasing, the resistance of ZnO/rGO composite decreases, and the sensitivity of its resistance variation reaches –0.67%/℃. Two sensors are integrated into one sensor chip which shows high stability. Therefore, the new sensor with practical and commercial potential is promising in the field of pH and temperature detection.