Recent updates on inkjet-printed sensors

Inkjet printing or inkjet-based printing (IP or IBP) is the critical part of controlled and rapid deposition of a wide range of reagents and biomaterials for (bio)sensing biomarkers, pesticides, hormones, and so on. The past decade has seen a renewed importance in precise spatial imprinting of testing agents on various substrates (paper, polydimethylsiloxane [PDMS], polyethylene terephthalate [PET], silicon, and glass) with the assistance of printers varying from a simple desktop office printer to an expensive one. Another striking feature of IP is simultaneous reagent printing, which has been utilized extensively for developing microanalytical devices. In this chapter, we outline the research updates over the last three years in analytical chemistry and healthcare areas for this facile approach. This chapter is organized as follows: firstly, we will provide a brief introduction to IP. Secondly, we will summarize and highlight different electrochemical, fluorescence, colorimetric, and device-based detection platforms with their respective materials printed through inkjet systems. We conclude with the future directions of IP.