Fe3O4/SiO2/YVO4:Eu3+ multifunctional nanoparticles are successfully synthesized by facile stepwise sol-gel processes. The multifunctional nanoparticles show a spherical shape with narrow size distribution (approximately 40 nm) and the phosphor shells are well crystallized. The Eu3+ shows strong photoluminescence (red emission at 619 nm, absorbance at 290 nm) due to an effective energy transfer from the vanadate group to Eu. Core-shell structured multifunctional nanoparticles have superparamagnetic properties at 300 K. Furthermore, the core-shell nanoparticles have a quick response time for the external magnetic field. These results suggest that the photoluminescence and magnetic properties could be easily tuned by either varying the number of coating processes or changing the phosphor elements. The nanoparticles may have potential applications for appropriate fields such as laser systems, optical amplifiers, security systems, and drug delivery materials.

Abstract
1. 서 론
2. 실험 방법
    2.1 자성 Fe3O4 나노 입자 합성
    2.2 자성 Fe3O4 나노 입자 위에 실리카 중간층 보호막 형성
    2.3 YVO4:Eu3+ 형광체 쉘로 Fe3O4/SiO2 콜로이드 코팅
    2.4 분석법
3. 결과 및 고찰
4. 결 론
References

• 김문경(강원대학교 신소재공학과) | Mun-Kyoung Kim (Department of Material Science and Engineering, Kangwon National University)
• 김세윤(삼성전자) | Seyun Kim (Inorganic Material Lab, Samsung Advanced Institute of Technology)
• 문경석(경상대학교 나노·신소재공학부) | Kyoung-Seok Moon (School of Materials Science and Engineering, Gyeongsang National University)
• 신원호(광운대학교 전자재료공학과) | Weon Ho Shin (Department of Electronic Materials Engineering, Kwangwoon University) Corresponding Author
• 정형모(강원대학교 신소재공학과) | Hyung Mo Jeong (Department of Material Science and Engineering, Kangwon National University) Corresponding Author