Review—Recent Progress in the Diversity of Inkjet-Printed Flexible Sensor Structures in Biomedical Engineering Applications

In this review, we summarize the latest advances in the development of various flexible sensors structure platforms fabricated by the inkjet printing technique. We first explain in general the type of biosensors which includes tactile sensors published recently that highlighted their features and uses, sensors architecture or platform and advantages of the designed platform. For better understanding of the inkjet printing process, we include the working inkjet printing system and strategy of ink jet printing process for quality and effective design of flexible and wearable applications. Then, we reviewed the types of biosensors and tactile sensor focusing on the flexible and wearable features subsequently highlighting several types of sensors fabricated via the inkjet printing method. The sensors highlighted were based on different types of sensor platforms namely the field effect transistor, standard electrode and special geometrical structure. The focus of insights for the different types of sensors platform were based on the operation, design and processing of inkjet-printed components. Lastly, an outlook on future challenges and research opportunities on inkjet-printed flexible biosensor for research development based on engineering and fundamental science in achieving effectiveness and reliability of inkjet-printed sensors is presented.