Dataset for "Ecoresorbable chipless temperature-responsive tag made from biodegradable materials for sustainable IoT"

This dataset contains the data collected during the SNSF BRIDGE GREENsPACK project (Grant no. 187223) in association with the publication entitled “Ecoresorbable chipless temperature-responsive tag made from biodegradable materials for sustainable IoT”. This study demonstrates the fabrication of a fully ecoresorbable, chipless, and wireless temperature-responsive tag, designed to irreversibly track temperature changes through a permanent shift in resonance frequency. The work presents the sustainable chipless technology from material selection and manufacturing processes to end-of-life disposal as an advanced thermal indicator solution for cold chain temperature-excursion detection. 

The tag is printed on a customized moisture-resistant poly(β-hydroxybutyrate)-cellulose composite substrate. An RLC circuit made of printed zinc metallic traces, encapsulated with beeswax to prevent oxidation, enables seamless wireless operation. The tag utilizes bio-based phase-changing materials such as frozen olive, jojoba, and coconut oils to induce irreversible resonance frequency shifts of more than 30 MHz at respective melting points of 8 °C, 15 °C, and 25 °C. A cellulose capillary element efficiently absorbs the melted oil, enabling reliable operation at inclinations from 0° to 90°. At the end of its service life, the device can undergo disintegration in a compost environment within 9 weeks.

The data that was collected in the frame of this work is present in this repository. It contains the data used for the publication of the manuscript and the supplementary information. Namely, results on the substrate selection and properties, design optimization of the tag and the S11 response of the chipless tag when phases-changing materials melt after exceeding critical temperature threshold. More information about the content of the dataset is present in the included README file.