Guided-Mode Resonance Grating with Self-Assembled Silver Nanoparticles for Surface-Enhanced Raman Scattering SpectroscopyReportar como inadecuado




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1

School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR 97331, USA

2

Department of Mechanical Engineering, The University of Texas at Austin, Austin, TX 78712, USA

3

Omega Optics, Inc., Austin, Texas 78757, USA

4

Department of Electrical and Computer Engineering, University of Texas at Austin, Austin, TX 78758, USA





*

Author to whom correspondence should be addressed.



Abstract We designed and fabricated guided-mode resonance GMR gratings on indium-tin-oxide ITO thin film to generate a significantly enhanced local electric field for surface-enhanced Raman scattering SERS spectroscopy. Ag nanoparticles NPs were self-assembled onto the surface of the grating, which can provide a large amount of -hot-spots- for SERS sensing. The ITO gratings also exhibit excellent tolerance to fabrication deviations due to the large refractive index contrast of the ITO grating. Quantitative experimental results of 5,5’-dithiobis2-nitrobenzoic acid DTNB demonstrate the best enhancement factor of ~14× on ITO gratings when compared with Ag NPs on a flat ITO film, and the limit of detection LOD of DTNB is as low as 10 pM. View Full-Text

Keywords: surface-enhanced Raman scattering; grating; silver nanoparticles; self-assembling; guided-mode resonance surface-enhanced Raman scattering; grating; silver nanoparticles; self-assembling; guided-mode resonance





Autor: Jing Yang 1, Fanghui Ren 1, Xinyuan Chong 1, Donglei Fan 2, Swapnajit Chakravarty 3, Zheng Wang 4, Ray T. Chen 4 and Alan X. Wang 1,*

Fuente: http://mdpi.com/



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