Tuesday 19th of February 2019
Iranian researchers used graphene to build an accurate pressure sensor
TEHRAN (INIC)- Iranian researchers from University of Tehran presented and evaluated a pressure sensor by using a specific arrangement of graphene.
The pressure sensor which has been built in nanometric scales can be used in various industries, including medical, military and automotive fields.
The aim of the research was to design and carry out theoretical calculations of a pressure sensor with high sensitivity by using graphene nanosheets and boron nitride. The sensor can have much higher sensitivity and working range than the usual graphene sensors. In addition, this sensor has a very simple production method, and has nanometric dimensions.
The structure of the sensor is based on the combination of two 2-dimensional components with nanometric thicknesses. Boron nitride sheets are placed between the two graphene sheets. Imposing pressure to the upper graphene sheet changes the distance between boron nitride sheets, and as a result, tunneling current between the carriers changes between the boron nitride sheets. The change in the current due to the change in distance is exponential, and it can be used as a tool to measure pressure.
Results of theoretical calculations and modeling showed that the linear working range of the sensor can reach 30 GHz, which is much higher than the working range of piezoresistive sensors. The sensitivity of the sensor can reach about 1300 pA/A/Pa.
Results of the research have been published in IEEE Electron Device Letters, vol. 36, issue 3, 2015, pp. 280-282.