Highly Sensitive, Wide-Sensing-Range rGO/NiMoO4@CMF Pressure Sensor Based on Biomimetic Mimosa Flowers for Health Monitoring and Human–Computer Interaction

Flexible wearable electronic skin (e-skin) has great potential in health monitoring, human–computer interaction, and other fields. However, traditional devices are often unable to maintain high sensitivity while achieving a wide detection range. In this work, inspired by biomimicry, we proposed a design based on mimosa flowers and developed a composite pressure sensing device (reduced graphene oxide (rGO)/NiMoO4@CMF). The strain layer of the sensor undergoes hydrothermal growth, allowing nickel molybdate (NiMoO4) to grow in situ on the surface of the carbon melamine foam (CMF). This enhances the substrate morphology, and rGO is then applied to increase the electrical conductivity. The devices prepared by this method have sensitivities of 19.3, 12.5, and 8.1 kPa–1 in the ranges of 0–12, 12–29, and 29–40 kPa, respectively. In addition, the sensor demonstrates a low detection limit (10 Pa), a fast response (160 ms), and a cycle retention rate of 86% after 5000 cycles. Based on these characteristics, the flexible sensor can detect strong human body movements in real time, such as finger bending, elbow movement, and knee bending. The study shows that this pressure sensor has broad application prospects in health monitoring.