신소재공학과

Research Highlight

Spray Coated Tactile Sensor on a 3-D Surface for Robotic Skin 이미지1

 

 

Robots will be able to conduct a wide variety of tasks as well as humans if they can be given tactile sensing capabilities. 

A KAIST research team has reported a stretchable pressure insensitive strain sensor by using an all solution-based process. The solution-based process is easily scalable to accommodate for large areas and can be coated as a thin-film on 3-dimensional irregularly shaped objects via spray coating. These conditions make their processing technique unique and highly suitable for robotic electronic skin or wearable electronic applications. 

The making of electronic skin to mimic the tactile sensing properties of human skin is an active area of research for various applications such as wearable electronics, robotics, and prosthetics. One of the major challenges in electronic skin research is differentiating various external stimuli, particularly between strain and pressure. Another issue is uniformly depositing electrical skin on 3-dimensional irregularly shaped objects.   

To overcome these issues, the research team led by Professor Steve Park from the Department of Materials Science and Engineering and Professor Jung Kim from the Department of Mechanical Engineering developed electronic skin that can be uniformly coated on 3-dimensional surfaces and distinguish mechanical stimuli.  The new electronic skin can also distinguish mechanical stimuli analogous to human skin. The structure of the electronic skin was designed to respond differently under applied pressure and strain. Under applied strain, conducting pathways undergo significant conformational changes, considerably changing the resistance. On the other hand, under applied pressure, negligible conformational change in the conducting pathway occurs; e-skin is therefore non-responsive to pressure. The research team is currently working on strain insensitive pressure sensors to use with the developed strain sensors. 

The research team also spatially mapped the local strain without the use of patterned electrode arrays utilizing electrical impedance tomography (EIT). By using EIT, it is possible to minimize the number of electrodes, increase durability, and enable facile fabrication onto 3-dimensional surfaces.  

Professor Park said, “Our electronic skin can be mass produced at a low cost and can easily be coated onto complex 3-dimensional surfaces. It is a key technology that can bring us closer to the commercialization of electronic skin for various applications in the near future.” 

The result of this work entitled “Pressure Insensitive Strain Sensor with Facile Solution-based Process for Tactile Sensing Applications” was published in the August issue of ACS Nano as a cover article.

 

 

 

Spray Coated Tactile Sensor on a 3-D Surface for Robotic Skin 이미지2
(Figure: Detecting mechanical stimuli using electrical impedance tomography.) 
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51 “Nature Materials” News & Views wrote by Prof. Sang Ouk Kim file admin 2015.02.17 11709
50 Hyper-stretchable elastic piezoelectric energy harvester file ADMINI 2015.04.29 9707
49 The Way towards Commercialization of Highly Efficient Nanogenerator file admin 2015.02.17 9229
48 Academic Achievements & Related Awards file admin 2015.02.17 9228
47 Best Paper Award at 2014 Pan Pacific Microelectronic Symposium file admin 2015.02.17 9050
46 The First Demonstration of Self-powered Cardiac Pacemaker file admin 2015.02.17 8972
45 Equipment Development: “Hu:u” -New Concept Indoor Environmental Gauge file admin 2015.02.17 5698
44 Making Graphene Using Laser-induced Phase Separation file ADMINI 2016.12.07 4564
43 Mobile Sensor Array Platform & its Circuit Development. file admin 2015.02.17 4069
42 Intel Best Paper Award at Electronic Components and Technology Conference file admin 2015.02.17 4049
41 Excellent Paper Award at the 2014 Conference on Next Generation Lithography file admin 2015.02.17 4047
40 Seon-Jin Choi, Jinsup Lee Prize Winner at the “9th 1nside” Edge International Thesis Competition from Samsung Electro-mechanics. file admin 2015.02.17 4001
39 One of 2013 KAIST Top 10 Representative R&D Outcomes. file admin 2015.02.17 3963
38 Grand Prize at the Dow Chemical Korea Award 2014 file admin 2015.02.17 3958
37 3D Free Standing Structure Made of Graphene. file admin 2015.02.17 3940
36 The Convergence New Technology Fair Silver Award file admin 2015.02.17 3931
35 Prize Winner at 20th SAMSUNG Human Tech Paper award (2013) file admin 2015.02.17 3841
34 Review article from Prof. Sang Ouk, Kim group was published in 25th anniversary of Advanced Materials. file admin 2015.02.17 3808
33 Excellent paper Award at the Optical Society of Korea. file admin 2015.02.17 3645
32 New Nanocomposite Catalyst applied for Li-O2 Batteries with improved High-capacity and Long-cycle file admin 2015.02.17 3625