Contents I. Introduction
With the application of flexible electronic printing technology to sensors, flexible sensors possess higher adaptability and flexibility compared to traditional sensors. Traditional electronic products equipped with this new generation of sensors can also have better performance in the fields of healthcare [1], [2], [3], robotics [4], [5], environmental monitoring [6], [7], food quality testing [8], [9], and microelectronic systems [10], [11]. Photolithography [12], [13] and printing [14], [15] are common fabrication techniques for flexible sensor construction. Photolithography allows for repetitive fabrication of high-performance devices but incurs high manufacturing costs due to the need for clean rooms and large consumable expenditures [16], [17]. Screen printingis a common manufacturing technique used in laboratories as it allows for the manufacturing of sensors to be efficient, reproducible, and cost-effective. However, depending on the size, layout, and appearance of the sensors, different mask plates need to be designed and manufactured, making the pre-design of the sensors relatively cumbersome [18]. Therefore, there is a need for an inexpensive printing technology with significantly lower manufacturing costs and higher productivity. Inkjet printing technology [19], [20], [21] has gradually attracted more and more attention from researchers in recent years as it avoids the use of stencil masks or clean room lithography. It can accurately and continuously deposit micro/nanomaterials onto a wide range of substrates under standard environmental conditions and can rapidly and cost-effectively print different graphics with high resolution, without the assistance of a mask.
