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2022 Vol.10, Issue 4 Preview Page

Research Article

A Study on Strain Sensors based on Carbon Composites Printed on Polymer Films to Improve Sensing Performance

센싱 성능 향상을 위해 고분자 필름에 인쇄된 탄소 복합체 기반 스트레인 센서 연구

Xue Qi1 and Sooman Lim2

제설1, 임수만2

1Ph.D, Department of Flexible and Printable Electronics, LANL-CBNU Engineering Institute-Korea, Jeonbuk National University
2Associate Professor, Department of Flexible and Printable Electronics, LANL-CBNU Engineering Institute-Korea, Jeonbuk National University
1전북대학교 유연인쇄전자 전문대학원 LANL-JBNU 공학연구소 박사
2전북대학교 유연인쇄전자 전문대학원 LANL-JBNU 공학연구소 부교수
31 December 2022. pp. 27-34
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Abstract
고분자 필름 폴리에틸렌 테레프탈레이트(polyethylene terephthalate-PET) 기반 탄소복합체를 활용한 스트레인 센서는 스크린 프린팅 기술로 제조된다. 이 센서는 다양한 물리적 영향을 감지하는데 적합하기 때문에 웨어러블 장치와 같은 폭넓은 응용 분야에 사용가능하다. 본 연구에서 탄소 복합소재를 합성하여 스크린 프린팅에 최적화된 잉크를 제조하였고 이를 PET에 인쇄하여 유연한 스트레인 센서를 제조하였다. 인쇄적성 평가를 위해 개발된 탄소 복합체는 레오로지 실험에서 전단담화 특성과 의존적인 요변성 결과를 가지는 특성을 보여주었고 고분자 필름에 프린팅 시 우수한 패턴 형성을 나타냈다. 이를 기반으로 스트레인 센서를 제조한 결과 상업용 센서와 동일한 감도인 게이지 팩터(Gauge Factor) 값이 2.05으로 나타났다. 이와 더불어 센서의 안정화 특성과 5단계 센싱 스트레인 값을 측정한 결과 안정적 특성을 보였으며 특히 순환벤딩 실험으로 측정된 안정화도는 1,000초 이상 지속적인 반복하에 히스테리시스가 없는 특성을 보여주었다. 따라서, 본 연구는 탄소 복합체를 활용하여 대면적, 대량생산이 용이하며 저비용의 센서를 제조할 수 있음을 시사하며 센서로서의 성능을 인정받아 향후 센서 시장에 활용 가능성을 보여주었다.
A strain sensor using a carbon composite based on a polymer film (polyethylene terephthalate-PET) manufactured by screen printing technology. This sensor can be used in a wide range of applications such as wearable devices because it is suitable for detecting various physical influences. In this study, an ink optimized for screen printing was prepared by synthesizing a carbon composite material, and a flexible strain sensor was manufactured by printing it on PET. The carbon composite developed for the evaluation of printability showed shear thinning properties and properties with dependent thixotropic results in the rheology experiment, and showed excellent pattern formation when printing on polymer films. As a result of manufacturing a strain sensor based on this, the Gauge Factor value, which is the same sensitivity as a commercial sensor, was found to be 2.05. In addition, the stabilization characteristics of the sensor and the five-step sensing strain value were measured to show stable characteristics. In particular, the stability measured by the cyclic bending experiment showed no hysteresis when continuously repeated more than 1,000 sec. Therefore, this study suggests that a large-area, mass-produced, and low-cost sensor can be manufactured using a carbon composite, and its performance as a sensor has been recognized, thus showing the possibility of application in the sensor market in the future.
Keywords
Carbon composite
Screen printing
Strain sensor
Rheology
Polymer film
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Information
  • Publisher :The Society of Convergence Knowledge
  • Publisher(Ko) :융복합지식학회
  • Journal Title :The Society of Convergence Knowledge Transactions
  • Journal Title(Ko) :융복합지식학회논문지
  • Volume : 10
  • No :4
  • Pages :27-34
  • DOI :https://doi.org/10.22716/sckt.2022.10.4.033
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