Park, Wooyoung Jang, Ho Seong Lee, Kwangyeol Woo, Kyoungja 2024-01-20T10:34:36Z 2024-01-20T10:34:36Z 2021-09-05 2014-01 1574-1443 https://pubs.kist.re.kr/handle/201004/127265 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. English SPRINGER IRON-OXIDE NANOPARTICLES LUMINESCENT NANOCOMPOSITES MICROSPHERES NANOCRYSTALS SPHERES SURFACE Synthesis of Multifunctional Silica Composites Encapsulating a Mixture Layer of Quantum Dots and Magnetic Nanoparticles Article 10.1007/s10904-013-9988-5 1 JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS, v.24, no.1, pp.78 - 86 JOURNAL OF INORGANIC AND ORGANOMETALLIC POLYMERS AND MATERIALS 24 1 78 86 scie scopus 000330856900008 2-s2.0-84927645750 Polymer Science Polymer Science Article IRON-OXIDE NANOPARTICLES LUMINESCENT NANOCOMPOSITES MICROSPHERES NANOCRYSTALS SPHERES SURFACE Multifunctional silica composite Quantum dot (QD) SPION Enhanced photoluminescence