Wireless sensor networks composed of internet of things (IoT) devices are beginning to play a key role in a wide range of areas, including urban management, food production, and climate forecasting. In the era of mass production and mass consumption of sensor devices, there is a need for biodegradable sensor devices. Nanopaper fabricated by drying of a water dispersion of cellulose nanofiber is a promising substrate for the biodegradable electronic devices thanks to the high surface smoothness, heat resistance, flexibility, high dielectric constant, and biodegradability. In this study, a nanopaper sensor device that combines humidity sensing, wireless information transmission, and degradability has been fabricated using wood-derived nanopaper as the substrate and dielectric layers. The nanopaper shows excellent suitability for capacitor dielectric layers due to its high dielectric constant, insulating and lamination properties. Nanopaper capacitor shows not only high-performance dielectric layers for capacitors but also suitability as humidity sensors. A wireless transmission circuit consists of the nanopaper capacitor, printed Ag conductive lines, and chip transistor can transmit radio signals in the megahertz band, and the relative humidity change can be output as a change in the radio signal owing to the humidity sensitivity of the nanopaper capacitor. In addition, it was confirmed that more than 95% of the total volume of the nanopaper sensor device degraded in soil after 40 days. Our results show that nanopaper sensor device has the potential to the realization of the green sensor networks.<br/>

Characterization of nanopaper capacitors and humidity sensors for green sensor networks

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.