Journal
NANOSCALE
Volume 10, Issue 16, Pages 7387-7395Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7nr09149d
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Funding
- National Natural Science Foundation of China [61771156, 51502059, 81571682]
- Foundation for Innovative Research Groups of the National Natural Science Foundation of China [51521003]
- Training Program of the Major Research Plan of the National Natural Science Foundation of China [91648201]
- Heilongjiang Provincial Postdoctoral Science Foundation Grant [LBH-Z15053]
- China Postdoctoral Science Foundation [2016T90279]
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The lack of high-performance tactile sensors, especially for pressure/force, is a huge obstacle for the widespread application of intelligent robots. Current pressure sensors are often operated in the high range of pressure and normal direction, showing a little ability in the low range of pressure and three-axis direction simultaneously. Herein, a highly sensitive flexible tactile sensor with three-axis force sensing capacity is presented by combining microstructured polydimethylsiloxane (PDMS) arrays and a reduced graphene oxide (rGO) film. The deformation of microstructured rGO/PDMS results in a change in the contact area between the rGO film and electrode, leading to a high sensitivity of -1.71 kPa(-1) in the low range pressure of 0-225 Pa with a fast response time of 6 ms at a large feature size of 100 mu m. To realize three-axis sensing, a sensing unit was built up, which was composed of the adjacent four parts of patterns and electrodes underneath a bump. A mechanical model of the exerted spatial force was established to calculate each axis force component via the deformation of the rGO/PDMS pattern. The experimental results show that the current difference between the adjacent two parts has a strong relationship with the applied force. As a proof of concept, we have demonstrated a 3 x 3 array sensor for arbitrary force sensing. Our tactile sensor would be used in transmitting information from a gentle spatial force and would exhibit broad applications as e-skin in integrated robots.
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