Graphene Pressure Sensor
Pressure sensors are important components used within a multitude of systems. By converting very small changes in pressure into larger, significant changes in an electrical current, pressure sensors have a wide range of applications. Applications include personal devices, industrial monitoring, navigation, ultrasonic imaging and biomedical devices. As such, there is a high demand for the development of smaller, more sensitive and more reliable pressure sensors that may be incorporated into emerging technologies.
Pressure sensors are able to work in a similar manner to variable capacitors. The relative position of one conductive surface to another, which is affected by changes in pressure, results in a varying electrical output. Typically, the conductive surfaces used in pressure sensors are metal-polymer or metal-ceramic composites. As such, the size and sensitivity of pressure sensors using metal plates is limited by the thickness and stiffness of the material. Therefore, to meet the demand for improved pressure sensors, alternative ultra-thin conductive materials should be used. One such material is graphene, an ultra-thin nanomaterial with extraordinary physical and electrical properties that make it ideal for incorporation into pressure sensors with significantly improved sensitivity and reduced size.
This technology uses a graphene membrane as the top surface in the sensor structure. The atomic thickness of graphene dramatically increases the sensitivity of the pressure sensor, in addition to reducing the overall size. Moreover, this technology offers further enhancement when compared to traditionally used pressure sensors by including a dielectric coating, which further increases the sensitivity and facilitates improved performance and reliability in all conditions. As such, this improved sensor represents a significant advancement in pressure sensing technology which may be incorporated into a wide range of technologies.
Benefits of this technology include:
- Greater accuracy and sensitivity due to the nanometer thickness of the graphene membranes used.
- Improved reliability and maintained performance under high pressures due to the incorporation of an ultra-thin dielectric.
- Significantly improved capacitance response; achieved by nano-scale engineering of the graphene membrane.
Potential applications of this technology include:
- Air or water flow sensors that may be used for aircraft or underwater navigation.
- Accelerometers used for motion sensing, orientation detection and free fall sensing.
- Acoustic sensors that may be used for ultrasonic imaging.
- Miniaturised biosensors used in medical applications or the development of triboelectric Nano-generators used to harvest energy from body movement and power medical devices within the body.
- Vibro-tactile systems used to restore or provide alternative sensations to patients with health conditions in which their tactile senses are diminished.
- Ultra thin touchscreens.
- Ultra sensitive microphones.
- Early warning earthquake detection systems.
Patent application: WO 2017/077331 A1.
Berger, C.; Dirschka, M.; Vijayaraghavan, A.; Ultra-thin Graphene-Polymer Heterostructure Membranes. Nanoscale. 2016, 8, 17928-17939. 10.1039/C6NR06316K
There are opportunities for partnership and collaboration regarding this technology.
Dr Siobhan Daniels, IP Development and Partnering Manager – Graphene, UMIP, Core Technology Facility, 46 Grafton Street, Manchester M13 9NT
T: + 44 (0) 161 306 8813
UMIP Ref: 20150028