한국분말야금학회지 Vol. 26 No. 6 (p.463-470)

자성 및 발광 특성이 조절 가능한 다기능 코어/중간체/쉘 나노 입자 합성

Synthesis of the Multifunctional Core/Intermediate/Shell Nanoparticles: Tunable Magnetic and Photoluminescence Properties
키워드 :
Core-shell nanoparticle,Magnetic properties,Photoluminescence,Rare-earth element,Host-guest materials

목차

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

초록

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.