Surface Enhanced Raman Scattering Effect of Au-Ag Alloy Films Based on Kretschmann Configuration†

doi:10.7503/cjcu20140297

Abstract

Abstract:

The surface enhanced Raman scattering(SERS) effect of Au-Ag alloy films was investigated, using a 532 nm laser source and the Kretschmann configuration. The experimental results indicate that when the incidence angle of the p-polarized beam meets the surface plasmon resonance(SPR) condition, the intensities of Raman peaks for Nile Blue molecules immobilized on the Au-Ag alloy film reaches maxima, being almost 2 times as high as those achieved with the pure gold layer. Gold nanoparticles(GNP) modification of the Au-Ag alloy films resulted in more than 3 times increase in Raman peak intensity. With the GNP-modified Au-Ag alloy film the Raman peaks are 2 times higher than those with the GNP-modified pure gold layer. The Raman signals detected with the probe placed below the prism substrate are completely non-polarized, but those detected along the reflected light beam on the side of the prism are p-polarized due to the SPR-coupled directional emission of Raman light excited in the evanescent-field region. The work demonstrated that the Au-Ag alloy films are advantageous over the conventional gold films for surface plasmon enhanced Raman spectroscopy.

Key words: Au-Ag alloy film, Surface enhanced Raman scattering(SERS), Kretschmann configuration, Polarized state

CLC Number:

O647

TrendMD:

LIU Delong, ZHAO Qiao, LU Danfeng, QI Zhimei. Surface Enhanced Raman Scattering Effect of Au-Ag Alloy Films Based on Kretschmann Configuration^†[J]. Chem. J. Chinese Universities, 2014, 35(10): 2207.

Figures/Tables 7

Fig.1 Schematic diagrams of the experimental setup with the Kretschmann configuration(A) and the field profile of the plasmon wave at the surface of the Au-Ag alloy film excited under the phase-match condition(Kxi=Ksp)(B)

Fig.2 Angle dependences of the field-enhancement factor for Au-Ag alloy films of different thicknesses simulated based on Fresnel formula(A) and maximum field-enhancement factors vs. thicknesses of pure gold film(a) and Au-Ag allog film(b)(B) λ=532 nm. (A) Thickness of Au-Ag alloy film/nm: a. 10; b. 20; c. 30; d. 40; e. 50; f. 60.

Fig.3 Raman spectra for the Nile Blue coat on the Au-Ag alloy film achieved at different incident angles(A) and angle dependences of the Raman peak intensities at 593 cm-1(a) and 1645 cm-1(b)(B)

Fig.4 Raman spectra for the Nile Blue coat on the Au-Ag alloy film excited with the p- and s-polarized incident beams and collected below the prism substrate with Probe A in Fig.1(A) and those collected along the reflected beam with Probe B in Fig.1(B) a. s-Polarized(Is); b. p-polarized(Ip); c. ΔI=IP-0.71Is.

Fig.5 Raman spectra for the Nile Blue coat on the Au-Ag alloy film detected with the linear-polarizer/Probe-A assembly(A) and with the linear-polarizer/Probe-B assembly(B) Spectra in (A) and (B) were excited by the p-polarized laser beam. a. Without polarizer; b. with p-polarizer; c. with s-polarizer.

Fig.6 Raman spectra of the Nile Blue coat on the Au-Ag alloy film(a) and pure gold film(b)(A) and on the glass/Au-Ag/GNP(a), glass/Au/GNP(b), glass/GNP(c) substrates(B) Spectra in (A) and (B) were excited by the p-polarized laser beam and detected with the probe A.

Fig.7 Raman spectra of the Nile Blue coat on the Au-Ag alloy film a. Excited with the Kretschmann configuration; b. direct irradiation of the sample with a focused laser beam.

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