Citation: ZHAO Qiao, LU Dan-Feng, CHEN Chen, QI Zhi-Mei. Characterization of Mesoporous Silica Film Sensitized SERS Substrates Based on Evanescent-Wave Excitation[J]. Acta Physico-Chimica Sinica, ;2014, 30(12): 2335-2341. doi: 10.3866/PKU.WHXB201410131 shu

Characterization of Mesoporous Silica Film Sensitized SERS Substrates Based on Evanescent-Wave Excitation

ZHAO Qiao ¹ ,
LU Dan-Feng ^1, ,
CHEN Chen ¹ ,
QI Zhi-Mei ^1,2

1.
1. State Key Laboratory of Transducer Technology, Institute of Electronics, Chinese Academy of Sciences, Beijing 100190, P. R. China;
2. State Key Laboratory of NBC Protection for Civilian, Beijing 102205, P. R. China

Received Date: 28 July 2014
Available Online: 13 October 2014
Fund Project: 国家重大科学仪器设备开发项目(2011YQ0301240802) (2011YQ0301240802) 国家自然科学基金(61377064) (61377064) 中国科学院科研装备研制项目(YZ201106) (YZ201106)国民核生化灾害防护国家重点实验室开放基金项目(SKLNBC2014-11)资助 (SKLNBC2014-11)

Sol-gel copolymer templated mesoporous silica (MPS) films of ~40 nm thickness were fabricated on the 50-nm-thick ld films sputtered on glass substrates. A top monolayer of ld nanoparticles (GNPs) was subsequently self-assembled on the MPS film to form an Au/MPS/GNPmultilayer structure for surface-enhanced Raman scattering (SERS) spectroscopy based on evanescent wave excitation. The open-pore structure of the MPS films, which was conducive to the rapid diffusion of small molecules into the film, was observed by scanning electron microscopy. Simulation using finite difference time domain (FDTD) solutions indicates that the evanescent field between the Au film and GNP layer of the Au/MPS/GNP substrate can be significantly enhanced under the surface plasmon resonance (SPR) condition. Owing to the complete spatial overlap, this enhanced field enables to superefficiently excite SERS signals from small molecules adsorbed in the MPS film. Moreover, the MPS film can effectively prevent the direct metal-molecule interaction, making the SERS signal immune to the interference by the metal. The SERS effect of the Au/MPS/GNP substrate loaded with Raman-active Nile blue (NB) molecules was investigated at 785 nm excitation wavelength with the Kretschmann configuration, and the experimental results were compared with those obtained using theAu/GNP substrate.With theAu/MPS/ GNP substrate very strong Raman signals were detected on the prism and air sides, respectively, under the SPR condition. The air-side Raman peak at 586 cm^-1 is 40 times as high as that with the Au/GNP substrate. This enhancement is attributed to the open-pore MPS film. The further measurements reveal a positive correlation between the air-side Raman peak intensity and the NB concentration of the solution sample, giving a sign that the Au/MPS/GNP substrate could be used for quasi-quantitative analysis.
- Open-pore mesoporous silica film,
- Evanescent wave excitation,
- Prism-side and air-side Raman signals,
- Quasi-quantitative analysis
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