Journal of Sensor Science and Technology (센서학회지)

The Korean Sensors Society (한국센서학회)
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Development of Optical Strain Sensor with Nanostructures on a Poly-dimethylsiloxane (PDMS) Substrate

Poly-dimethylsiloxane (PDMS) 기판 위에 형성된 나노구조를 이용한 시각 인장센서의 개발

  • Kim, Geon Hwee (Department of Mechanical Engineering, POSTECH) ;
  • Woo, Hyeonsu (Department of Mechanical Engineering, POSTECH) ;
  • Lim, Geunbae (Department of Mechanical Engineering, POSTECH) ;
  • An, Taechang (Department of Mechanical Design Engineering, Andong National Unversity)
  • 김건휘 (포항공과대학교 기계공학과) ;
  • 우현수 (포항공과대학교 기계공학과) ;
  • 임근배 (포항공과대학교 기계공학과) ;
  • 안태창 (국립안동대학교 기계설계공학과)
  • Received : 2018.08.27
  • Accepted : 2018.10.31
  • Published : 2018.11.30
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Abstract

Structural color has many advantages over pigment based color. In recent years, researches are being conducted to apply these advantages to applications such as wearable devices. In this study, strain sensor, a kind of wearable device, was developed using structural color. The use of structural color has the advantage of not using energy and complex measuring equipment to measure strain rate. Wrinkle structure was fabricated on the surface of Poly-dimethylsiloxane (PDMS) and used it as a sensor which color changes according to the applied strain. In addition, a transmittance-changing sensor was developed and fabricated by synthesizing additional glass nanoparticles. Furthermore, a strain sensor was developed that is largely transparent at the target strain and opaque otherwise.

Keywords

HSSHBT_2018_v27n6_392_f0001.png 이미지

Fig. 2. The optical photograph and colors of a tensile sensor fabricated by wrinkle structure. Depending on the degree of the strain, the size and spacing of the wrinkle structure changes, resulting in a change in structural color.

HSSHBT_2018_v27n6_392_f0002.png 이미지

Fig. 3. The optical photograph of tensile sensor fabricated by wrinkle structure and glass nanoparticles. As the strain is applied, diffuse reflection occurs due to the glass nanoparticle and wrinkle structure, and the transmittance is decreased.

HSSHBT_2018_v27n6_392_f0003.png 이미지

Fig. 1. (A) A method for producing a PDMS film having a wrinkle structure when stretched. (a) O2 plasma treatment is performed on the PDMS substrate. (b) A thin SiO2 thin film is formed on the surface of the PDMS substrate. (c) When strain is applied, wrinkles are formed in a direction parallel to the strain. (B) Photograph of the wrinkle structure observed with an optical microscope. (C) Photograph of the wrinkle structure observed with a scanning electron microscope.

HSSHBT_2018_v27n6_392_f0004.png 이미지

Fig. 4. (A) A method of making a tensile sensor that exhibits the highest transmittance at a particular tensile rate. (B) Scanning electron microscope image of fabricated strain sensor. (C) Photograph of a tensile sensor designed to have the highest transmittance at a tensile rate of 20%.

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