Indian Researchers have developed a flexible graphene-based capacitive sensor fabricated on paper
In the new approach, scientists led by Dr. Hemen Kumar Kalita, along with his PhD students Rajnandan Lahkar and Biswajit Dehingia, fabricated a graphene-based capacitive sensor on a simple paper substrate. They drew interdigitated electrodes directly on the paper using an ordinary pencil, while graphene oxide (GO) served as the active sensing material.
Because the electrodes are pencil-drawn and the device uses paper as its base, the sensor is lightweight, flexible and highly cost-effective. It avoids the need for costly metals, cleanroom facilities and chemically intensive manufacturing.
The research, published in the peer-reviewed journal ACS Applied Electronic Materials, demonstrates that the sensor exhibits exceptionally high sensitivity to humidity and moisture, responding with changes of more than 1,500 % at elevated humidity levels — far outperforming many existing paper-based flexible sensors.
