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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.
하유나,함은일,김형모,강은지,김태용,전봉현 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0
In this study, we demonstrated thin silica-coated and assembled Ag NPs (SiO2@Ag@SiO2 NPs) for simultaneous and quantitative detection of chemicals that have different intrinsic affinities to silver metal. These NPs were detected each SERS peak of aniline or 4-aminothiophenol from the mixture with limits of detection of 93 ppm and 54 ppb, respectively. E-field distribution based on interparticle distance was simulated using discrete dipole approximation calculation to gain insight into enhanced scattering of these thin silica coated Ag NP assemblies. These NPs were successfully applied to detect aniline in river water and tap water. Results suggest that SiO2@Ag@SiO2 NP-based SERS detection systems can be used as a simple and universal detection tool for safety.
Scale-up of SERS nanoprobes with high reproducibility and long-term stability
김형모,함은일,김재희,경산,이윤식,전봉현 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.0
Surface-enhanced Raman scattering nanoprobes (SERS dots) were prepared using a large-scale synthetic method. High sensitivity of the SERS dots was demonstrated by analyzing single particles, and their long-term stability was proved by storing them in buffer solution and deionized water for 300 hours. These features suggest that the SERS dots can be utilized as a targeting agent in practical applications.
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.