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[Display omitted] • Reproducible sensors using biodegradable substrates and eco-friendly materials. • Use of cost-effective techniques for their fabrication. • Simplified layout for the joint measurement of RH and temperature on the same IDES. Given the increasing number of connected devices as a consequence of the Internet of Things (IoT) revolution, the issue of the removal and recycling of electronics is becoming more and more urgent. In this context, biodegradable electronics is expected to be one of the biggest technological revolutions to tackle this problem. Following this direction, in this work we present the fabrication and characterization of temperature and humidity sensors based on biodegradable materials with the goal of making their removal easier as well as reducing their environmental impact. In particular, these multi-sensing devices were fabricated following a screen-printing process using a carbon-based paste and a conjugated polymer, both on paper and on a water soluble substrate. The results are more than promising and show how with our biodegradable sensors it is possible to obtain a sensitivity of 1 dec/20%RH to moisture content and around 0.04%/°C sensitivity to temperature. It is demonstrated that the simplicity and flexibility of the fabrication approach followed in this work paves the way to a set of new "green" IoT nodes that could be extended to wide range of sensing applications. [ABSTRACT FROM AUTHOR]

Uniform, ultra‐thin, and conformal films of conducting polymers can be readily fabricated directly onto large‐area substrates by oxidative chemical vapor deposition (oCVD). Since oCVD avoids high substrate temperatures and the use of solvents, no transfer step is required for integrating oCVD films into devices, even when employing paper and textile substrates. More details can be found in article number 1801564 by Meysam Heydari Gharahcheshmeh and Karen K. Gleason. Photo‐illustration by Felice C. Frankel. [ABSTRACT FROM AUTHOR]