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Sensing technologies have been under research and development for theirvaried applications from microelectronics to space exploration. With the end ofMoores law in sight, there is growing demand for shrinking materials andimproving sensitivity and range of sensing of sensors. Carbon nanotubes (CNTs)offer an excellent combination of small size (in the order of nanometers in twodimensions and micrometers in the third dimension), varied current conductivity(from insulating to metallic), flexibility, mechanical strength and feasibilityof mass production. Here we used CNTs to fabricate pressure sensors to sensestatic loads of pressure and studied the characteristics of different methodsof building the sensors. We offer an adhesive-absorption technique offabrication of pressure sensors that tackles the issue of endurance of thesensors to repeated operation. We demonstrate a significant change inresistance of a vertically aligned forest of nanotubes upon application ofstatic loads. This study will enable building of better pressure sensors forseveral applications.

Pressure sensing using vertically aligned carbon nanotubes on a flexible substrate