실리카 코어 금 위성입자의 합성 및 표면 증강 라만 산란을기반으로 한 센서로의 응용
Synthesis of Silica-Core Gold-Satellite Nanoparticles and Their Surface-enhanced Raman Scattering Based Sensing Application
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In this study, we synthesize silica-core gold-satellite nanoparticles (SGNPs) for the surface-enhancedRaman scattering (SERS) based sensing applications. They consist of gold satellite nanoparticles (AuNPs) fixed on thesilica core nanoparticles, which sizes of AuNPs can be tunned by varying the amount of reactants (growth solution andreducing agent). Their surface plasmon resonance (SPR) properties were characterized by using UV-vis spectroscopy,showing that the growth of AuNPs on silica cores leads to the light absorption in the longer wavelength region. Furthermore,the size increase of AuNPs exhibited the dramatic change in SERS activity due to the formation of hot spots. The optimized SGNPs showing enhancement factor~3.8×106 exhibited a detection limit of rhodamine 6G (R6G) as low as 10−8 M. These findings suggest the importance of size control of SGNPs and their SPR properties to develop highly efficientSERS sensors.
Abstract
In this study, we synthesize silica-core gold-satellite nanoparticles (SGNPs) for the surface-enhancedRaman scattering (SERS) based sensing applications. They consist of gold satellite nanoparticles (AuNPs) fixed on thesilica core nanoparticles, which sizes of AuNPs can be tunned by varying the amount of reactants (growth solution andreducing agent). Their surface plasmon resonance (SPR) properties were characterized by using UV-vis spectroscopy,showing that the growth of AuNPs on silica cores leads to the light absorption in the longer wavelength region. Furthermore,the size increase of AuNPs exhibited the dramatic change in SERS activity due to the formation of hot spots. The optimized SGNPs showing enhancement factor~3.8×106 exhibited a detection limit of rhodamine 6G (R6G) as low as 10−8 M. These findings suggest the importance of size control of SGNPs and their SPR properties to develop highly efficientSERS sensors.
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