E-skin bimodal sensors for robotics and prosthesis using PDMS molds engraved by laser

Andreia dos Santos, Nuno Pinela, Pedro Alves, Rodrigo Santos, Ricardo Farinha, Elvira Fortunato, Rodrigo Martins, Hugo Águas, Rui Igreja

Research output: Contribution to journalArticle

Abstract

Electronic skin (e-skin) is pursued as a key component in robotics and prosthesis to confer them sensing properties that mimic human skin. For pressure monitoring, a great emphasis on piezoresistive sensors was registered due to the simplicity of sensor design and readout mechanism. For higher sensitivity, films composing these sensors may be micro-structured, usually by expensive photolithography techniques or low-cost and low-customizable molds. Sensors commonly present different sensitivities in different pressure ranges, which should be avoided in robotics and prosthesis applications. The combination of pressure sensing and temperature is also relevant for the field and has room for improvement. This work proposes an alternative approach for film micro-structuration based on the production of highly customizable and low-cost molds through laser engraving. These bimodal e-skin piezoresistive and temperature sensors could achieve a stable sensitivity of -6.4 × 10-3 kPa-1 from 1.6 kPa to 100 kPa, with a very robust and reproducible performance over 27,500 cycles of objects grasping and releasing and an exceptionally high temperature coefficient of resistance (TCR) of 8.3%/°C. These results point toward the versatility and high benefit/cost ratio of the laser engraving technique to produce sensors with a suitable performance for robotics and functional prosthesis.

LanguageEnglish
Article number899
Number of pages15
JournalSensors
Volume19
Issue number4
DOIs
Publication statusPublished - 21 Feb 2019

Fingerprint

Molds
Robotics
Engraving and Engravings
robotics
Prostheses and Implants
Skin
Lasers
Fungi
Pressure
sensors
Sensors
engraving
lasers
Costs and Cost Analysis
Temperature
Skin Temperature
Cost-Benefit Analysis
sensitivity
Costs
Photolithography

Keywords

  • bimodal sensors
  • electronic skin
  • laser engraving
  • micro-structuration
  • molds
  • piezoresistivity
  • pressure
  • prosthesis
  • robotics
  • temperature

Cite this

dos Santos, A., Pinela, N., Alves, P., Santos, R., Farinha, R., Fortunato, E., ... Igreja, R. (2019). E-skin bimodal sensors for robotics and prosthesis using PDMS molds engraved by laser. Sensors, 19(4), [899]. https://doi.org/10.3390/s19040899
dos Santos, Andreia ; Pinela, Nuno ; Alves, Pedro ; Santos, Rodrigo ; Farinha, Ricardo ; Fortunato, Elvira ; Martins, Rodrigo ; Águas, Hugo ; Igreja, Rui. / E-skin bimodal sensors for robotics and prosthesis using PDMS molds engraved by laser. In: Sensors. 2019 ; Vol. 19, No. 4.
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dos Santos, A, Pinela, N, Alves, P, Santos, R, Farinha, R, Fortunato, E, Martins, R, Águas, H & Igreja, R 2019, 'E-skin bimodal sensors for robotics and prosthesis using PDMS molds engraved by laser' Sensors, vol. 19, no. 4, 899. https://doi.org/10.3390/s19040899

E-skin bimodal sensors for robotics and prosthesis using PDMS molds engraved by laser. / dos Santos, Andreia; Pinela, Nuno; Alves, Pedro; Santos, Rodrigo; Farinha, Ricardo; Fortunato, Elvira; Martins, Rodrigo; Águas, Hugo; Igreja, Rui.

In: Sensors, Vol. 19, No. 4, 899, 21.02.2019.

Research output: Contribution to journalArticle

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AU - dos Santos, Andreia

AU - Pinela, Nuno

AU - Alves, Pedro

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AU - Fortunato, Elvira

AU - Martins, Rodrigo

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AU - Igreja, Rui

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dos Santos A, Pinela N, Alves P, Santos R, Farinha R, Fortunato E et al. E-skin bimodal sensors for robotics and prosthesis using PDMS molds engraved by laser. Sensors. 2019 Feb 21;19(4). 899. https://doi.org/10.3390/s19040899