| 학회 | 한국재료학회 |
| 학술대회 | 2020년 가을 (11/18 ~ 11/20, 휘닉스 제주 섭지코지) |
| 권호 | 26권 1호 |
| 발표분야 | A. 전자/반도체 재료 분과 |
| 제목 | Study on high repeatability characteristic of stretchable graphite resistive pressure sensor |
| 초록 | Recently, A lot of wearable sensors for health monitoring are developed. Especially, the flexible, stretchable sensors have been important and basic issue for either medical diagnosis or daily health monitoring. In this work efforts have been focused on realizing a wearable, skin compatible and low-cost solution for measuring skin pressure. In this study, our developed sensor has a strain gauge method that induces a change in resistance when strain is generated by tension or pressure. It measures a change in pressure caused by a pulse as a change in resistance. Here, a screen printed resistive pressure sensor that offers high sensitivity and can be fabricated using a very simple process. It is composed of conductive graphite (cond20, SamjungC&G) and polyurethane binder(clearflex0030). The diameter of graphite is 20nm. Three different contents of graphite are 32.2wt%, 38.7wt%, 44.2wt%. The printing process is a stencil printing using a metal mask. The mask thickness is 80μm. We printed on 200μm thickness of polyurethane film. The effects of binder and substrate materials on the repeatability, response, hysteresis behavior is showed. When a 30g force is applied, the graphite electrode as well as the substrate are deformed. It caused the electrical resistance to change. For graphite sensor with 32.2wt% content, Changes in resistance due to pressure up to 7.8kPa were measured. It showed repeatability characteristics for 0.02kPa-1. The amount of change in resistance versus initial resistance is 16.67%. For graphite sensor with 38.7wt% content, change in resistance is very low compared to 32.2wt% contents. It showed the sensitivity of repeatability 0.004kPa-1. The amount of change in resistance versus initial resistance is 3.28%. For graphite sensor with 44.2wt% content, there is no change in resistance when pressure is applied. In conclusion, the sensor printed with 32.2wt% graphite paste has the best repeatability at a pressure of 7.8kPa. If this paste is used to change the pattern and measure it after printing, it is expected that a higher sensitivity sensor can be developed. It could be applied to various part of wearable device such as medical area. |
| 저자 | Shinyoung Kim1, Hyun Jin Nam2, Yeon Hwa Kwak2, Kunnyun Kim2, Taeyoon Lee3 |
| 소속 | 1Yonsei Univ. / Korea Electronics Technology Institute, 2Korea Electronics Technology Institute, 3Yonsei Univ. |
| 키워드 | strain; strethable; resistive pressure sensor; graphite |
