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Sutrová V, Šloufová I, Melníková Z, Kalbáč M, Pavlova E, Vlčková B. Effect of Ethanethiolate Spacer on Morphology and Optical Responses of Ag Nanoparticle Array-Single Layer Graphene Hybrid Systems. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:14414-14424. [PMID: 29172530 DOI: 10.1021/acs.langmuir.7b03462] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Single layer graphene (SLG) and two-dimensional (2-D) plasmonic Ag nanoparticle arrays assembled by chemisorption of ethanethiol (ET) molecules (AgNPs-ET) were employed as components of two types of hybrid systems designed for surface-enhanced Raman scattering (SERS) spectral probing of SLG localized in the vicinity of plasmonic NPs. Both hybrids were characterized by optical microscopy, transmission electron microscopy (TEM), surface plasmon extinction (SPE), and SERS microRaman spectral measurements at four excitation wavelengths spanning the 445-780 nm range. SERS spectral probing of the glass/SLG/AgNPs-ET hybrid prepared by overdeposition of SLG on glass by the array of ET-modified Ag NPs has shown that the chemisorbed ET acts as an efficient molecular spacer between SLG and Ag NPs surface which, in turn, enabled to obtain SERS spectra of SLG unperturbed by doping or strain. TEM imaging and SERS spectral probing of the second hybrid prepared by overdeposition of AgNPs-ET array on glass by SLG revealed removal of the adsorbed ET molecules and annealing of Ag NPs during the SLG deposition. The characteristics of the resulting glass/AgNPs/SLG hybrid system, namely (i) broad distribution of the annealed Ag NPs sizes and shapes, (ii) SPE curve covering the overall visible spectral region, (iii) absence of the ET spectral bands in SERS spectra, and (iv) fairly uniform SERS enhancement of the G and 2D mode of SLG in the 532-780 nm range in the straight sample geometry indicate that this hybrid can provide a suitable platform for investigation of the excitation wavelength dependence of combined SERS/GERS (graphene-enhanced Raman scattering) enhancement experienced by various molecular species brought into contact with SLG in this hybrid. Finally, weak optical effects attributed to increased reflectivity of SLG in the near field of Ag NPs arrays have been observed in the excitation wavelength dependence of the SERS spectra of both types of hybrid systems.
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Affiliation(s)
- Veronika Sutrová
- Faculty of Science, Department of Physical and Macromolecular Chemistry, Charles University , Hlavova 8, Prague 2, 128 40, Czech Republic
- Institute of Macromolecular Chemistry AS CR , Heyrovsky Square 2, 162 06 Prague 6, Czech Republic
| | - Ivana Šloufová
- Faculty of Science, Department of Physical and Macromolecular Chemistry, Charles University , Hlavova 8, Prague 2, 128 40, Czech Republic
| | - Zuzana Melníková
- J. Heyrovsky Institute of Physical Chemistry of the ASCR , v.v.i, Dolejškova 3, 182 21 Prague 8, Czech Republic
| | - Martin Kalbáč
- J. Heyrovsky Institute of Physical Chemistry of the ASCR , v.v.i, Dolejškova 3, 182 21 Prague 8, Czech Republic
| | - Ewa Pavlova
- Institute of Macromolecular Chemistry AS CR , Heyrovsky Square 2, 162 06 Prague 6, Czech Republic
| | - Blanka Vlčková
- Faculty of Science, Department of Physical and Macromolecular Chemistry, Charles University , Hlavova 8, Prague 2, 128 40, Czech Republic
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Huang LC, Wang Z, Clark JK, Ho YL, Delaunay JJ. Plasmonic tooth-multilayer structure with high enhancement field for surface enhanced Raman spectroscopy. NANOTECHNOLOGY 2017; 28:125206. [PMID: 28170345 DOI: 10.1088/1361-6528/aa5ebf] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The significant enhancement seen in surface-enhanced Raman scattering (SERS) heavily relies on the ability of plasmonic structures to strongly confine light. Current techniques used to fabricate plasmonic nanostructures have been limited in their reproducibility for bottom-up techniques or their feature size for top-down techniques. Here, we propose a tooth multilayer structure that can be fabricated by using physical vapor deposition and selective wet etching, achieving extremely small feature sizes and high reproducibility. A multilayer structure composed of two alternating materials whose thicknesses can be controlled accurately in the nanometer range is deposited on a flat substrate using ion-beam sputtering. Subsequent selective wet etching is used to form nanogaps in one of the materials constituting the multilayer, with the depth of the nanogaps being controlled by the wet etching time. Combining both techniques can allow the nanogap dimensions to be controlled at sub 10 nm length scale, thus achieving a tooth multilayer structure with high enhancement and tunability of the resonance mode over a broad range, ideal for SERS applications.
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Affiliation(s)
- Li-Chung Huang
- School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan
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Schneidewind H, Weber K, Zeisberger M, Hübner U, Dellith A, Cialla-May D, Mattheis R, Popp J. The effect of silver thickness on the enhancement of polymer based SERS substrates. NANOTECHNOLOGY 2014; 25:445203. [PMID: 25319270 DOI: 10.1088/0957-4484/25/44/445203] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We investigated silver-covered polymer based nanogratings as substrates for surface-enhanced Raman spectroscopy (SERS), in particular with respect to the thickness of the plasmonically active silver film. In order to obtain accurate geometrical input data for the simulation process, we inspected cross sections of the gratings prepared by breaking at cryogenic temperature. We noticed a strong dependence of the simulation results on geometrical variations of the structures. Measurements revealed that an increasing silver film thickness on top of the nanogratings leads to a blue shift of the plasmonic resonance, as predicted by numerical simulations, as well as to an increased field enhancement for an excitation at 488 nm. We found a clear deviation of the experimental data compared to the simulated results for very thin silver films due to an island-like growth at a silver thickness below 20 nm. In order to investigate the SERS activity. we carried out measurements with crystal violet as a model analyte at an excitation wavelength of 488 nm. The SERS enhancement increases up to a silver thickness of about 30 nm, whereas it remains nearly constant for thicker silver films.
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Affiliation(s)
- H Schneidewind
- Leibniz Institute of Photonic Technology, Albert-Einstein-Strasse 9, 07745 Jena, Germany
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Cialla D, Weber K, Böhme R, Hübner U, Schneidewind H, Zeisberger M, Mattheis R, Möller R, Popp J. Towards multiple readout application of plasmonic arrays. BEILSTEIN JOURNAL OF NANOTECHNOLOGY 2011; 2:501-508. [PMID: 22003456 PMCID: PMC3190620 DOI: 10.3762/bjnano.2.54] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Accepted: 08/12/2011] [Indexed: 05/05/2023]
Abstract
In order to combine the advantages of fluorescence and surface-enhanced Raman spectroscopy (SERS) on the same chip platform, a nanostructured gold surface with a unique design, allowing both the sensitive detection of fluorescence light together with the specific Raman fingerprint of the fluorescent molecules, was established. This task requires the fabrication of plasmonic arrays that permit the binding of molecules of interest at different distances from the metallic surface. The most efficient SERS enhancement is achieved for molecules directly adsorbed on the metallic surface due to the strong field enhancement, but where, however, the fluorescence is quenched most efficiently. Furthermore, the fluorescence can be enhanced efficiently by careful adjustment of the optical behavior of the plasmonic arrays. In this article, the simultaneous application of SERS and fluorescence, through the use of various gold nanostructured arrays, is demonstrated by the realization of a DNA detection scheme. The results shown open the way to more flexible use of plasmonic arrays in bioanalytics.
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Affiliation(s)
- Dana Cialla
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Karina Weber
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - René Böhme
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Uwe Hübner
- Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745 Jena, Germany
| | - Henrik Schneidewind
- Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745 Jena, Germany
| | - Matthias Zeisberger
- Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745 Jena, Germany
| | - Roland Mattheis
- Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745 Jena, Germany
| | - Robert Möller
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany
| | - Jürgen Popp
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich-Schiller-University Jena, Helmholtzweg 4, 07743 Jena, Germany
- Institute of Photonic Technology, Albert-Einstein-Straße 9, 07745 Jena, Germany
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