传统气体传感器加载敏感材料多采用电极表面直接滴涂方式,该方法存在材料加载量难以精确控制、重复性差等问题。为解决上述问题开发了基于电射流打印制备柔性气体传感器的新方法,自主搭建了低成本电射流打印装置,配制了以Ti3C2 MXene材料为基础的功能墨水,讨论了打印条件对Ti3C2 MXene基功能墨水打印图形尺寸的影响。在Ti3C2 MXene功能墨水中加入气敏材料In2O3,在聚对苯二甲酸乙二醇酯柔性叉指电极上通过电射流打印制备了柔性气体传感器并测试了其灵敏度。结果表明:采用0.3% Ti3C2 MXene/7% PEO(聚氧化乙烯)溶液作为电射流打印的功能墨水,可以保证在开启电压较小的同时形成分辨率较高的图形;在施加电压2500V,打印距离1mm,注射泵流速300nL/min,基板移动速度300mm/min的锥射流打印条件下,沉积的图形规整有序、直径均匀,尺寸为(2.56±0.32)μm;柔性气体传感器灵敏度较高。
The traditional methods for loading sensitive materials onto gas sensor mainly adopt direct drop coatings on electrode surfaces,which has many problems such as uncontrollable material load and poor repeatability.To solve the above problems,a new method for fabricating flexible gas sensor based on electrohydrodynamic jet printing was proposed in this paper.A low-cost electrohydrodynamic jet printing platform was established,and a functional ink based on Ti3C2 MXene material was prepared.The influence of printing conditions on the size of Ti3C2 MXene functional ink printing pattern was discussed in detail.The flexible gas sensors were fabricated by printing Ti3C2 MXene-based functional ink composite typical gas sensitive material In2O3 on PET flexible electrodes,and its sensitivity was tested.The results showed that using a 0.3% Ti3C2 MXene/7% PEO solution as the functional ink for electrohydrodynamic jet printing could ensure the formation of high-resolution patterns while maintaining a relatively low activation voltage.Under the cone jet printing conditions of an applied voltage of 2500V,a printing distance of 1mm,an injection pump flow rate of 300nL/min,and a substrate moving speed of 300mm/min,the deposited patterns were regular and orderly,with uniform diameters of (2.56±0.32)μm.The flexible gas sensor exhibited high sensitivity.
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基金资助
山西省自然科学基金资助项目(202103021223069)
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