Low-cost sensor tape for environmental sensing based on roll-to-roll manufacturing process

Abstract

Abstract-We describe the concept of fabricating low-cost sensor tape for fine-grid environmental sensing based on roll-toroll manufacturing processes. We experiment with constructing sensors and electronic connections with low-cost conductive inkjet printed copper traces. Our first attempt is to fabricate humidity sensors by spin-coating conductive polymer on sensor substrates and integrating the design with an embedded system. The humidity sensor was tested in a two-point probe and exhibits the I-V profile of a diode. We demonstrated a working humidity sensor with an impedance variance of 30 kΩ from 99% to 58% RH within 300 seconds under a 1.4 volt bias.

A Cuttable Wireless Power Transfer Sheet

“…Our work is heavily inspired by prior research on cuttable electronics, which can be categorized into two groups: 1) modular and programmable 1-D sensor arrays [9,11,15,49] and 2) cuttable 2-D sensor sheets [33]. The former can be separated and rejoined to make various shapes.…”

“…Thus, there is only 4 × 4 array about the configuration of square TX coil arrays considering the proper size of TX coil to charge smartphones. Assuming that we can access to B-to-B large-scale PCB fabrication services, which are based on roll-to-roll process [11], this restriction would not exist; some manufacturers can fabricate the PCBs as large as 1 m times a few hundred meters. Furthermore, printing technologies for functional electronic components are rapidly advancing; this is a promising technology for integrating the wiring and flexible organic components so that the fabrication process concludes in a single printing procedure [38].…”