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함은일,김형모,( Xuan-hung Pham ),김태한,이윤식,전봉현 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1
We design the sensor materials, which have a β-Cyclodextrin dimer on silver nanoparticles embedded with silica nanoparticles (Ag@SiO<sub>2</sub> NPs) structure, and measured their ability of detecting polycyclic aromatic hydrocarbons (PAHs). As a substrate for intensifying surfaceenhanced Raman scattering(SERS) signal, Ag@SiO<sub>2</sub> NPs were used as sensitive SERS structure and a dimeric β-CD was added on the surface of Ag NPs to capture PAHs. The structure of β-CD dimer@Ag@SiO<sub>2</sub> NPs was confirmed by TEM, UV-vis and ATR-FTIR. The β-CD dimer@Ag@SiO<sub>2</sub> NPs had a wide linearity range of 10<sup>-7</sup> M to 10<sup>-2</sup> M with a low detection limit of 10<sup>-8</sup> M for detecting perylene (one kind of PAHs). Furthermore, the possibility of the β-CD dimer@Ag@SiO<sub>2</sub> NPs was demonstrated as a selective and a multiplex detection for organic materials and various PAHs. This approach of combining an assembled structure and the ligands to recognize target has potential for utilizing in sensitive analytical sensors.
김윤희,함은일,조아라,안재현,성보미,전봉현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Highly sensitive surface-enhanced Raman scattering (SERS) probes were developed based on the growth of Ag onto Au nanoparticles (NPs) on the surface of silica NPs (SiO<sub>2</sub>@Au@Ag). We used ascorbic acid as a reducing agent for Ag ions and polyvinylpyrrolidone (PVP) as a structure-directing agent. By adjusting the concentration of AgNO<sub>3</sub>, the nanogaps between two Ag NPs on the surface of the SiO<sub>2</sub>@Au@Ag were tuned. Originating from a highly enhanced E-field at the nanogaps (<1 nm) between two Ag NPs of the SiO<sub>2</sub>@Au@Ag NPs, strong Raman signals were obtained. The proposed NPs exhibited low limit of detection (LOD) of 2.4 nM for 4-amino-benzophenol and showed a high reproducibility in deviation of 14.2 %.
Detection of Flavonoids using β-Cyclodextrin (β-CD) derivatives introduced SERS-based Nanosensors
김윤희,함은일,조아라,안재현,성보미,전봉현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
Ethylenediamine-conjugated β-Cyclodextrins (EN-β-CD) were introduced on the surface of silver nanoparticles-embedded silica nanoparticles (SiO<sub>2</sub>@Ag@EN-β-CD NPs) as a capturing ligand of flavonoids. The Ag NPs embedded structure provides hot spots and the surfaceenhanced Raman scattering (SERS) signals are obtained. EN-β-CDs on the Ag NPs form complexes with flavonoids by host-guest inclusion. In this study, the prepared SiO<sub>2</sub>@Ag@EN-β-CD NPs were reacted with several flavonoids, such as quercetin, hesperetin, naringenin, and luteolin. And their Raman scattering signals were measured. Among them, luteolin showed the best working range (10<sup>-7</sup> to 10<sup>-3</sup> M) than other organic compounds. The signal was maintained even after five times of washing.
Assembly of Plasmonic and Magnetic Nanoparticles for Dual-function Light Scattering-Magnetic Probe
김형모,함은일,안재현,조아라,성보미,김윤희,전봉현 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
The silica coated superparamagnetic Fe<sub>3</sub>O<sub>4</sub> nanoparticles (MNPs) have unique properties that can be controlled by external magnetic field. Also, gold nanoparticles (Au NPs) have various peoperties which of generation of surface plasmons that absorb light and enhance an electromagnetic field by the collective and resonant excitation of free electronsand. The hybrid nanoparticles using these two NPs are can be made more effectively by utilizing the advantages of materials. In this study, we report fabrication of multifunctional material containing MNPs and clustered Au NPs. First, the monodispersed silica coated magnetic nanoparticles (MNP@SiO<sub>2</sub> NPs, 104.2 nm ± 2.4 nm) that synthesized of gram-scale synthetic showed superparamagnetism and no aggregation was detected. Also, Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>@Au NPs that synthesized by additional modifications were also prepared by simply adding Au NP to magnetic NPs and showed 500 % higher light scattering than single gold NPs of the same size.