보고서 정보
주관연구기관 |
한국과학기술원 Korea Advanced Institute of Science and Technology |
연구책임자 |
박오옥
|
보고서유형 | 최종보고서 |
발행국가 | 대한민국 |
언어 |
대한민국
|
발행년월 | 2017-12 |
과제시작연도 |
2017 |
주관부처 |
과학기술정보통신부 Ministry of Science and ICT |
등록번호 |
TRKO201800022469 |
과제고유번호 |
1711064318 |
사업명 |
한국과학기술원연구운영비지원(0.5) |
DB 구축일자 |
2018-06-16
|
DOI |
https://doi.org/10.23000/TRKO201800022469 |
초록
Abstract
▼
1. Research Purpose
- Explain why this research is new and important
The development of sensors for the wearable devices has been of much interest in the healthcare, virtual reality, and robotics industries. Particularly, strain sensor, which can convert strain into electric signals, is an imp
1. Research Purpose
- Explain why this research is new and important
The development of sensors for the wearable devices has been of much interest in the healthcare, virtual reality, and robotics industries. Particularly, strain sensor, which can convert strain into electric signals, is an important part of wearable devices that interact with diverse human motions. However, conventional strain sensors are composed of rigid and brittle materials like metal or semiconductor. Due to their limiting range of strain detection, conventional sensors are not suitable for wearable devices. To solve this limitation, the use of various potential conducting materials in strain sensors has been investigated for several decades. Graphene, a two-dimensional carbon nanomaterial, exhibits outstanding electrical and mechanical properties due to its honeycomb-like structure of sp2-hybridized carbon atoms. It also has biocompatibility and piezo-resistivity, all of which make it a promising material for use in strain sensors, rather than other conductive materials: metal nanoparticles, conducting polymers.
Due to the sensing mechanism of the graphene based strain sensor (crack propagation), the graphene grown by chemical vapor deposition show the outstanding sensitivity, but poor stretchability1. On the other hand, solution-processed graphene show the good stretchability due to the percolated structure of graphene flakes, but it exhibits poor sensitivity. 2Some researches introduce patterned structure on the graphene to give more sensitivity of the sensor. Although these patterned-sensors exhibited outstanding sensitivity, their complex process for fabricating pattern remained as limitations to produce in massive-scale.
Therefore, in this research project, we are focused on the solution-processible method for fabricating graphene strain sensor. Through our previous research, sensitivity controllable graphene strain sensor can be fabricated by layer-by-layer assembly technique3. However, in our previous research, the sensor, which was fabricated by layer-by-layer assembly, also showed low sensitivity. Thus, we suggest a patterned substrate to coat it with graphene by layer-by-layer assembly method, in order to enhance sensitivity of the sensor.
- Justify how this research is connected to the project suggested by KU PI
Professor Kin Liao’s group (KU PI) have concentrated their researches on graphene strain sensors for several years. Specifically, they were focused on the carbonization of materials such as paper tissues, Ni foam, etc.4,5,6 Due to their excellent mechanical properties, it was able to use these materials as the wearable strain sensor. Thus, they utilize these sensors to wearable device for monitoring human motions with great reliability and fast responses.
Our group have also researched graphene based strain sensor, which can be fabricated by coating on the stretchable yarns with graphene dispersion3. Through our researches on graphene based strain sensor, the purpose of this proposed research is closely related with both our and their research area and future research plans. To reach the final goal of this research project, the research has been conducted together with not only our techniques such as preparing solution-processible graphene and coating it by layer-by-layer assembly, but also the KU group’s expertise such as fabricating strain sensors and its characterization.
- Expected impact of research results in both the research area and UAE
During this research project, we have fabricated the graphene strain sensor with enhanced sensitivity without significant reduce of its stretchability. Patterning process of polymeric film did an important role to enhance the sensitivity of this sensor. Although patterned structure of the sensor reduces its stretchability, however, coating solution processed-graphene on the polymer substrate gives more stretchability and controllable sensitivity of the sensor due to their percolated state in the film form. Thus, we can obtain graphene strain sensor with the targeted sensitivity and stretchability, because of scalable and cost-effective method. Transferring graphene layer onto elastic PDMS substrate, the sensor can be used it as flexible and wearable strain sensor with attaching on specific position of our body. These results can contribute to the massive-scale production of strain sensing devices, by the further development.
UAE has the world’s sixth largest proven oil reserves and the fifth largest natural gas reserves. Subsequently, UAE is the third greatest exporter of the petroleum oils. Based on these affluent resources, population of the nations in Gulf Cooperation Council (GCC), including UAE, is increased faster than the other countries. Hence, high population growth rate of the GCC countries require large demands of health-care devices especially for the wearable devices. Main function of wearable device on medical use is monitoring personal health status in real-time. As a result, it allows patients to receive quick diagnosis and prescription. For these wearable device’s various application, development of a new material is essential such as graphene-based-device.
Currently the devices market for medical purpose in the GCC is primarily import-based, with 96 % of medical equipment supplied by the Unites States and Germany and a total projected expenditure increased to 819 million USD in the UAE alone by the end of 2014. In Saudi Arabia, less than 3% of the total expenditure on medical equipment is for local products that are typically limited to low-technology consumables, such as syringes and catheters. Thus, this research project will do an important role that is the development of self-sufficient market of health care devices in UAE and the Middle East, particularly strain sensor, which is the one of essential compartments of the device.
(출처 : 본문 1. Research Purpose 3p)
목차 Contents
- COVER ... 1
- 1. Research Purpose ... 3
- - Explain why this research is new and important ... 3
- - Justify how this research is connected to the project suggested by KU PI ... 4
- - Expected impact of research results in both the research area and UAE ... 5
- 2. Research Target Using Progress Chart ... 5
- - Target of the year ... 5
- - Long-term target ... 6
- 3. Research Method ... 7
- (a) Step1. Patterning polymer substrate ... 7
- (b) Step2. Coating polymer substrate with graphene by solution-processible method ... 7
- (c) Step3. Fabrication of patterned sensor ... 8
- (d) Characterization and application ... 8
- 4. Research Results ... 9
- (1)Research achievements ... 9
- (2)Further research required ... 21
- End of Page ... 21
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