Abstract
Structural, optical, and morphological properties of Ag thin films before and after etching were investigated by using X-ray diffraction, UV-Vis spectrophotometer, and field emission scanning electron microscopy (FESEM). The HNO3roughened Ag thin films exhibit excellent enhancement features and better stability than pure Ag thin films. Further, the Ag nanostructures are covered with Rhodamine 6G (Rh6G) and then tested with surface enhanced raman spectroscopy (SERS) for active substrates. Etched Ag films were found to exhibit a strong SERS effect and excellent thermal stability. Hence, the present method is found to be useful in the development of plasmon-based analytical devices, especially SERS-based biosensors.
Highlights
Surface-enhanced Raman scattering (SERS) is a sensitive tool for exploring metal/adsorbate interactions and reactivity of adsorbed species [1,2,3,4,5,6,7,8,9,10]
The SERS effect relates to the localized surface plasmon resonance of Ag nanoparticles, which is manifested in the absorption spectrum as an intensive and broad band
The pure, etched Ag films structural properties were studied by X-ray diffraction (XRD) and the optical absorption of Ag thin films was determined by JASCO optical spectrophotometer
Summary
Surface-enhanced Raman scattering (SERS) is a sensitive tool for exploring metal/adsorbate interactions and reactivity of adsorbed species [1,2,3,4,5,6,7,8,9,10]. Surface plasmon resonance (SPR), which is associated with collective electron resonance induced by incident light on a rough metal surface, is one of the electromagnetic effects contributing largely to the SERS phenomenon. In addition to their easy preparation and chemical stability, this kind of monolayer can find practical applications such as those in the area of highly resistant surface modifications [11,12,13,14]. We aim to report a study of optical properties on the etching rate dependence of the surface-induced morphology of Ag thin films for SERS active substrates
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