초록 ▼

● 전자파 흡수용 그래핀 복합 필름 제조
- 이온 교환법과 화학 환원제를 이용하여 GO 표면에 Fe 나노입자가 deposition된 GO/Fe 하이브리드 입자 제조 기술 개발
- GO/Fe 함유된 전자파 흡수용 복합재 필름을 제조하고 근접장 전자파 흡수능을 평가한 결과, 6GHz에서 80% 이상의 전자파를 흡수함에 따라 기존의 흡수체에 비해 낮은 함량에서도 동등 이상 수준의 흡수 성능을 나타냄.
● 산화 그래핀 박막 코팅법을 이용한 철(Fe) 강판의 내부식성 향상 연구
- 중성 및 염기 분위기의 GO 수용액을

● 전자파 흡수용 그래핀 복합 필름 제조
- 이온 교환법과 화학 환원제를 이용하여 GO 표면에 Fe 나노입자가 deposition된 GO/Fe 하이브리드 입자 제조 기술 개발
- GO/Fe 함유된 전자파 흡수용 복합재 필름을 제조하고 근접장 전자파 흡수능을 평가한 결과, 6GHz에서 80% 이상의 전자파를 흡수함에 따라 기존의 흡수체에 비해 낮은 함량에서도 동등 이상 수준의 흡수 성능을 나타냄.
● 산화 그래핀 박막 코팅법을 이용한 철(Fe) 강판의 내부식성 향상 연구
- 중성 및 염기 분위기의 GO 수용액을 제조한 후, 순철에 대한 최적 스핀 코팅 조건을 확립하여 부식 전압을 -800mV에서 -530mV으로 향상시킴.
- 순철과 GO 코팅된 철에 대한 염수 분무 실험을 통해 GO 코팅의 강판 부식 방지 효과를 확인함.

Abstract ▼

Graphene is a 2D carbon material consisting of hexagonal sp2-hybridized monolayer.
It is well known that graphene has outstanding electrical and thermal conductivities and also exhibits excellent mechanical properties and high transparency compared to existing carbon materials. Because of its exc

Graphene is a 2D carbon material consisting of hexagonal sp2-hybridized monolayer.
It is well known that graphene has outstanding electrical and thermal conductivities and also exhibits excellent mechanical properties and high transparency compared to existing carbon materials. Because of its exceptional properties, great attention has been paid to graphene and graphene-based composites in recent year.
Among many methods to achieve successful reinforcing graphene into the composite materials, the solution-based method is the most promising technique since the homogeneous colloidal suspension can provide high processability and flexibility to the large-scale production. Typical solution-based method can provide a large amount of graphene oxide (GO) which is made from low-priced graphite particles by a chemical oxidation/exfoliation. GO can be changed into reduced graphene oxide (rGO) by chemical or thermal treatments. In addition, GO retains several active functional groups and can be homogeneously dispersed in an aqueous or organic media. However, since several-hundred micrometer of initial graphites is treated by a strong oxidizing reagent followed by a mechanical exfoliation, they split into a smaller size GO. As a result, there is inherent limitation in producing large-area GO because GO originates from graphite powders. Probably, this small-size GO shows poor surface electrical conductivity when it is deposited on a substrate especially by a spin-coating and a solution-casting.
In this study, Iron (Fe)-deposited graphene oxide (GO) particles with different ratios of GO to Fe were fabricated and analyses of TEM, SEM and VSM for the particles were carried out to optimize the fabrication conditions considering the proper magnetization and the better dispersion. The Fe-deposited GOs with the ratio of 1:2 were used as secondary filler to assist the primary hollow magnetic fibers for the improvement of near-field electromagnetic absorption property measured by a microstrip line method. We prepared composite films including 30wt% of the primary hollow fiber and 2wt% of several kinds of secondary fillers: Fe-deposited GO, GO and Fe nanoparticles. The power losses of the composite films showed that the incorporation of a small amount of the Fe-deposited GOs into the film with the hollow fibers could lead to dramatic increase in the power loss compared to the cases of other secondary fillers. According to the experimental results, it is concluded that this increase is attributed to the fact that Fe-deposited GOs which are aligned on in-plane direction and placed among the hollow fibers throughout the film can play a role in connecting the hollow fibers and spreading electric and magnetic field originated from the signal.

목차 Contents

• 표지 ... 1
• 제출문 ... 2
• 보고서 초록 ... 3
• 요약문 ... 4
• SUMMARY ... 5
• CONTENTS ... 6
• 목차 ... 7
• 제 1 장 연구개발과제의 개요 ... 8
• 제 2 장 국내외 기술개발 현황 ... 9
• 제 3 장 연구개발수행 내용 및 결과 ... 10
• 제 1절 전자파 흡수용 그래핀 복합 필름 제조 연구 ... 10
• 제 2절 산화 그래핀 박막 코팅법을 이용한 철(Fe) 강판의 내부식성향상 연구 ... 17
• 제 4 장 목표달성도 및 관련분야에의 기여도 ... 21
• 제 5 장 연구개발결과의 활용계획 ... 22
• 제 6 장 참고문헌 ... 23
• 끝페이지 ... 24