Synthesis of Multifunctional Silica Composites Encapsulating a Mixture Layer of Quantum Dots and Magnetic Nanoparticles
- Authors
- Park, Wooyoung; Jang, Ho Seong; Lee, Kwangyeol; Woo, Kyoungja
- Issue Date
- 1월-2014
- Publisher
- SPRINGER
- Keywords
- Multifunctional silica composite; Quantum dot (QD); SPION; Enhanced photoluminescence
- Citation
- JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS, v.24, no.1, pp.78 - 86
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS
- Volume
- 24
- Number
- 1
- Start Page
- 78
- End Page
- 86
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/99732
- DOI
- 10.1007/s10904-013-9988-5
- ISSN
- 1574-1443
- Abstract
- Multifunctional silica colloidal composites with enhanced photoluminescence (PL) and superparamagnetism are reported. Enhanced PL and superparamagnetism were achieved by encapsulating a mixture layer of quantum dots (QDs) and superparamagnetic iron oxide nanoparticles (SPIONs) within a silica sphere, wherein QDs and SPIONs were capped by 3-mercaptopropionic acid (MPA) and 2-carboxy ethyl phosphonic acid (CEPA), respectively. The silica composites encapsulating a mixture layer of QDs and SPIONs, i.e., S(Q,M)S core(layer)shell architectures with various diameters (80, 360, and 900 nm) were successfully prepared by utilizing electrostatic interaction between positively charged amine-functionalized silica (S) and negatively charged mixture of QD-MPA (Q) and SPION-CEPA (M) and then, by forming a silica shell of 10-20 nm. The S(Q,M)S showed more than twice higher PL intensity than MPA-capped QD with the same QD concentration. Increasing the molar ratio of M/Q from 0.02 to 0.05 in the S(Q,M)S increased the saturation magnetization value from 0.15 to 0.62 emu/g. The S(Q,M)S composites with enhanced PL intensity and superparamagnetism are expected to be a plausible probe material for bioimaing and sensing application. Also, the current synthetic strategy for S(Q,M)S composites is expected to be extendible to include other functional nanoparticles.
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Collections - College of Science > Department of Chemistry > 1. Journal Articles
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