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Compact Shielding of Graphene Monolayer Leads to Extraordinary SERS-Active Substrate with Large-Area Uniformity and Long-Term Stability.

Liu X, Wang J, Wu Y, Fan T, Xu Y, Tang L, Ying Y - Sci Rep (2015)

Bottom Line: Surface-enhanced Raman scattering (SERS) can significantly boost the inherently weak Raman scattering signal and provide detailed structural information and binding nature of the molecules on the surface.Besides, our fabrication strategy were also capable of fabricating the reproducible SERS sensing spots array, which may serve as a promising high-throughput or multi-analyte sensing platform.Taken together, the graphene-shielded SERS substrate holds great promise both in fundamental studies of the SERS effect and many practical fields.

View Article: PubMed Central - PubMed

Affiliation: College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.

ABSTRACT
Surface-enhanced Raman scattering (SERS) can significantly boost the inherently weak Raman scattering signal and provide detailed structural information and binding nature of the molecules on the surface. Despite the long history of this technology, SERS has yet to become a sophisticated analytical tool in practical applications. A major obstacle is the absence of high-quality and stable SERS-active substrate. In this work, we report a monolayer graphene-shielded periodic metallic nanostructure as large-area uniform and long-term stable SERS substrate. The monolayer graphene acting as a corrosion barrier, not only greatly enhanced stability, but also endowed many new features to the substrate, such as alleviating the photo-induced damages and improving the detection sensitivity for certain analytes that are weakly adsorbed on the conventional metallic substrates. Besides, our fabrication strategy were also capable of fabricating the reproducible SERS sensing spots array, which may serve as a promising high-throughput or multi-analyte sensing platform. Taken together, the graphene-shielded SERS substrate holds great promise both in fundamental studies of the SERS effect and many practical fields.

No MeSH data available.


Related in: MedlinePlus

Schematic illustration of the graphene-shielded SERS substrate array (a). The cross-section (b,c) and the top-view (d,e) SEM images of the graphene-shielded SERS substrate array; the Raman spectra (f) and adsorption spectra (g) of the metal-coated nanospheres substrates with or without graphene coating.
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f1: Schematic illustration of the graphene-shielded SERS substrate array (a). The cross-section (b,c) and the top-view (d,e) SEM images of the graphene-shielded SERS substrate array; the Raman spectra (f) and adsorption spectra (g) of the metal-coated nanospheres substrates with or without graphene coating.

Mentions: Figure 1a schematically depicted the as-prepared graphene-shielded SERS substrate. In this work, a standardized metal-coated nanospheres arrays (MCNAs)31 were employed as the SERS substrate. (for detail see Figure S1 in the Supporting Information). Briefly, a monolayer of nanospheres arrays (silica or polystyrene) was firstly assembled at the water-air interface and then transferred onto a clean silica wafer (~1 × 1 cm2). Subsequently, a ~200 nm thick silver film was deposited on the nanospheres array, resulting in a MCNAs SERS substrate. Finally, a CVD-grown graphene film was transferred onto the above MCNAs substrate via a wet transfer technique.


Compact Shielding of Graphene Monolayer Leads to Extraordinary SERS-Active Substrate with Large-Area Uniformity and Long-Term Stability.

Liu X, Wang J, Wu Y, Fan T, Xu Y, Tang L, Ying Y - Sci Rep (2015)

Schematic illustration of the graphene-shielded SERS substrate array (a). The cross-section (b,c) and the top-view (d,e) SEM images of the graphene-shielded SERS substrate array; the Raman spectra (f) and adsorption spectra (g) of the metal-coated nanospheres substrates with or without graphene coating.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4663485&req=5

f1: Schematic illustration of the graphene-shielded SERS substrate array (a). The cross-section (b,c) and the top-view (d,e) SEM images of the graphene-shielded SERS substrate array; the Raman spectra (f) and adsorption spectra (g) of the metal-coated nanospheres substrates with or without graphene coating.
Mentions: Figure 1a schematically depicted the as-prepared graphene-shielded SERS substrate. In this work, a standardized metal-coated nanospheres arrays (MCNAs)31 were employed as the SERS substrate. (for detail see Figure S1 in the Supporting Information). Briefly, a monolayer of nanospheres arrays (silica or polystyrene) was firstly assembled at the water-air interface and then transferred onto a clean silica wafer (~1 × 1 cm2). Subsequently, a ~200 nm thick silver film was deposited on the nanospheres array, resulting in a MCNAs SERS substrate. Finally, a CVD-grown graphene film was transferred onto the above MCNAs substrate via a wet transfer technique.

Bottom Line: Surface-enhanced Raman scattering (SERS) can significantly boost the inherently weak Raman scattering signal and provide detailed structural information and binding nature of the molecules on the surface.Besides, our fabrication strategy were also capable of fabricating the reproducible SERS sensing spots array, which may serve as a promising high-throughput or multi-analyte sensing platform.Taken together, the graphene-shielded SERS substrate holds great promise both in fundamental studies of the SERS effect and many practical fields.

View Article: PubMed Central - PubMed

Affiliation: College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310058, China.

ABSTRACT
Surface-enhanced Raman scattering (SERS) can significantly boost the inherently weak Raman scattering signal and provide detailed structural information and binding nature of the molecules on the surface. Despite the long history of this technology, SERS has yet to become a sophisticated analytical tool in practical applications. A major obstacle is the absence of high-quality and stable SERS-active substrate. In this work, we report a monolayer graphene-shielded periodic metallic nanostructure as large-area uniform and long-term stable SERS substrate. The monolayer graphene acting as a corrosion barrier, not only greatly enhanced stability, but also endowed many new features to the substrate, such as alleviating the photo-induced damages and improving the detection sensitivity for certain analytes that are weakly adsorbed on the conventional metallic substrates. Besides, our fabrication strategy were also capable of fabricating the reproducible SERS sensing spots array, which may serve as a promising high-throughput or multi-analyte sensing platform. Taken together, the graphene-shielded SERS substrate holds great promise both in fundamental studies of the SERS effect and many practical fields.

No MeSH data available.


Related in: MedlinePlus