초록

Abstract ▼

□ 연구개요
The fine particulate matter(PM2.5) in the polluted air adversely affects human health. The research goal pursed through this study is to manufacture a self-cleaning hollow semiconducting fiber film to adsorb PM2.5 with high efficiency. Semiconductor fibers are fabricated from 2D materials

□ 연구개요
The fine particulate matter(PM2.5) in the polluted air adversely affects human health. The research goal pursed through this study is to manufacture a self-cleaning hollow semiconducting fiber film to adsorb PM2.5 with high efficiency. Semiconductor fibers are fabricated from 2D materials such as graphene, MXene and transition metal dichalcogen compunds using a novel supercritical fluid assembly technology. In addition, we propose a new class of photocatalysts known as upconversion semiconductors that can effectively harvest solar energy to decompose PM2.5 concentrated in air filters and provide antibacterial activity. This self-cleaning membrane can be used repeatedly for a long time for both indoor and outdoor air filter devices.

□ 연구 목표대비 연구결과
▷ New core-shell up-conversion semiconductor nanocrystals for efficient solar energy harvesting : NaYF4:Yb,Er upconversion nanoparticle was synthesized under high pressure and inert atmosphere. With aid of surfactant, fabricated nanoparticle was covered with semiconducting metal oxide called α-Fe2O3 by hydrothermal method and observed by STEM-HAADF images. Under 1 sun system, using methyleneblue(MB) degradation method in solution state, more than 99% photo-catalytic behaviour was measured on rGO based substrate with 5 times of recycling.
▷ Novel tailored supercritical fluid assembly technique : Liquid crystalline 2D graphene oxide solution was extruded into coagulation bath. Accordingly, well-aligned 1D fiber structure was fabricated and used for appropriate substrate of metal nitride growth or non-woven fabric for enhanced mechanical property of membrane.
▷ Fabrication of semiconducting hollow fibers by supercritical fluid spinning : For the high surface area, porous graphene membrane structure was fabricated instead of hollow fiber structure. Freeze-thawing, gas formation via hydrazine reducing agent or coating on commercial PM filter was chosen as candidates. Fabricated structure was observed through SEM to analyze porosity and uniformity.
▷ Filtration applications for PM2.5 and aerosols : Home-made PM filter machine was fabricated by using PM sensors and vacuum pump. Commercially available filters confirmed that the equipment showed exact PM filter efficiency more than 99%.
▷ Self-cleaning property of semiconducting membrane : Antibacterial activity and photo-degradation property of fabricated semiconducting membrane should be studied in the near future.

□ 연구개발성과의 활용 계획 및 기대효과(연구개발결과의 중요성)
The application of this study is that it is possible to apply indoor and outdoor air filters. Successful expected effect of the proposed study is that it can provide a paradigm of highly efficient and sustainable particle matter removal matierals. Applications may include residential, commercial and industrial end consumers.

(source : 연구결과 요약문 2p)

목차 Contents

• COVER ... 1
• 연구결과 요약문 ... 2
• 목차 ... 3
• 1. 연구개발과제의 개요 ... 4
• 2. 연구개발과제의 수행 과정 및 수행 내용 ... 5
• 3. 연구개발과제의 수행 결과 및 목표 달성 수준 ... 6
• 1) 정성적 연구개발성과(연구개발결과) ... 6
• 2) 세부 정량적 연구개발성과 ... 12
• 3) 목표 달성 수준 ... 13
• 4) 목표 미달 시 원인 분석 ... 15
• 4. 연구개발성과의 관련 분야에 대한 기여 정도(연구개발결과의 중요성) ... 16
• 5. 연구개발성과의 관리 및 활용 계획 ... 17
• 6. 참고문헌 ... 17
• 붙임1. 세부 정량적 연구개발성과 ... 18
• 붙임2. 연구책임자 대표적 연구실적 및 증빙(요약문 및 사본) ... 22
• End of Page ... 28