3D customized and flexible tactile sensor using a piezoelectric nanofiber mat and sandwich-molded elastomer sheets

Title
3D customized and flexible tactile sensor using a piezoelectric nanofiber mat and sandwich-molded elastomer sheets
Author
윤종헌
Keywords
3D printing; 3D scanning; PDMS molding; electrospinning; piezoelectric system
Issue Date
2017-03
Publisher
IOP PUBLISHING LTD
Citation
SMART MATERIALS AND STRUCTURES, v. 26, No. 4, Article no. 045032
Abstract
We developed a skin-conformal flexible sensor in which three-dimensional (3D) free-form elastomeric sheets were harmoniously integrated with a piezoelectric nanofiber mat. The elastomeric sheets were produced by polydimethylsiloxane (PDMS) molding via using a 3D printed mold assembly, which was adaptively designed from 3D scanned skin surface geometry. The mold assembly, fabricated using a multi-material 3D printer, was composed of a pair of upper/lower mold parts and an interconnecting hinge, with material properties are characterized by different flexibilities. As a result of appropriate deformabilites of the upper mold part and hinge, the skin-conformal PDMS structures were successfully sandwich molded and demolded with good repeatability. An electrospun poly(vinylidene fluoride trifluoroethylene) nanofiber mat was prepared as the piezoelectric active layer and integrated with the 3D elastomeric parts. We confirmed that the highly responsive sensing performances of the 3D integrated sensor were identical to those of a flat sensor in terms of sensitivity and the linearity of the input-output relationship. The close 3D conformal skin contact of the flexible sensor enabled discernable perception of various scales of physical stimuli, such as tactile force and even minute skin deformation caused by the tester's pulse. Collectively from the 3D scanning design to the practical application, our achievements can potentially meet the needs of tailored human interfaces in the field of wearable devices and human-like robots.
URI
http://iopscience.iop.org/article/10.1088/1361-665X/aa64ca/metahttp://repository.hanyang.ac.kr/handle/20.500.11754/71826
ISSN
0964-1726; 1361-665X
DOI
10.1088/1361-665X/aa64ca
Appears in Collections:
COLLEGE OF ENGINEERING SCIENCES[E](공학대학) > MECHANICAL ENGINEERING(기계공학과) > Articles
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