Design and Implementation of Leaf Wetness Sensor with different Graphene Oxide Concentration

Abstract

Prediction of early plant diseases is essential to reduce crop loss. Early disease prediction models have been investigated for this purpose, where data on leaf wetness duration (LWD) is one of the important elements. Leaf wetness sensors (LWS) are used to measure the leaf wetness duration (LWD). Here, graphene oxide (GO) is used as the sensing film in the sensor to detect the water molecules on the leaf canopy. LWS is fabricated on a flexible polyamide substrate using interdigitated electrodes. The fabricated GO LWS was tested in a lab condition. We exposed the entire sensing film to water molecules and observed that it responded by around 120000% for GO-3 sensor, 90000% for GO-2 sensor, and 37000% for GO-1 sensor at 1KHz compared to the air. The observed response time of the fabricated sensor is around 180 sec with a recovery time of about 10 sec. However, when exposed to temperatures ranging from 20 0C to 70 0C, the fabricated sensor shows only a 2.3% change in response.