Biodegradable Sensors Offer Sustainable Monitoring for Agriculture

Researchers at Auburn University have developed a new type of temperature and humidity sensor designed to enhance agricultural monitoring while minimizing environmental impact. Published in the Journal of Laser Applications, their estudiar presents paper-based sensors as an eco-friendly alternative to conventional plastic-based electronic monitoring systems.

Accurate monitoring of temperature and humidity is essential for optimizing greenhouse conditions and preserving harvested crops. While various sensors exist for these purposes, many rely on nonbiodegradable materials, raising concerns about environmental sustainability. The Auburn research team addressed this issue by utilizing paper as a substrate, taking advantage of its biodegradability and porous structure.

The sensors were created using a dry additive nanomanufacturing technique to print silver lines onto four types of commercially available paper. Their function is based on changes in electrical properties: capacitance shifts as the paper absorbs moisture, indicating humidity levels, while resistance variations in the conductive material reflect temperature changes. Testing demonstrated that the sensors effectively detected humidity fluctuations between 20% and 90% and temperature variations from 25°C to 50°C.

In addition to their accuracy, the sensors offer cost advantages and reusability, with safe disposal options once they are no longer functional. The study highlights the potential of biodegradable sensors to contribute to more sustainable agricultural practices by providing precise environmental monitoring without the drawbacks of traditional plastic-based electronics.