Journal
SENSORS
Volume 18, Issue 4, Pages -Publisher
MDPI
DOI: 10.3390/s18041001
Keywords
3D printing; stretchable electronics; pressure sensor; PDMS; conductive elastomer
Funding
- NSFC Projects of International Collaboration Project [51761145101]
- NSFC program China [51602011]
- Guangdong Talents Project
- National Basic Research Program of China (973 Program) [2015CB856505]
- Shenzhen Peacock Program [KQTD2014062714543296]
- Shenzhen Engineering Laboratory [SFG(2016)1592]
- Shenzhen Science Technology research grant [JCYJ20160510144254604]
- Guangdong Key Research Project [2014B090914003, 2015B090914002]
- Shenzhen Key Laboratory of Shenzhen Science and Technology Plan [ZDSYS20140509094114164]
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We demonstrate the successful fabrication of highly sensitive capillary pressure sensors using an innovative 3D printing method. Unlike conventional capacitive pressure sensors where the capacitance changes were due to the pressure-induced interspace variations between the parallel plate electrodes, in our capillary sensors the capacitance was determined by the extrusion and extraction of liquid medium and consequent changes of dielectric constants. Significant pressure sensitivity advances up to 547.9 KPa-1 were achieved. Moreover, we suggest that our innovative capillary pressure sensors can adopt a wide range of liquid mediums, such as ethanol, deionized water, and their mixtures. The devices also showed stable performances upon repeated pressing cycles. The direct and versatile printing method combined with the significant performance advances are expected to find important applications in future stretchable and wearable electronics.
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