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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

(a) Comparison of CV spectra from graphene-shielded SERS substrate before and after treated by 6.5% HNO3 for 1 min; (b) As a control test, the SERS substrate without graphene protection was measured under same conditions. The CV signal completely vanished after the etching by HNO3.
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f5: (a) Comparison of CV spectra from graphene-shielded SERS substrate before and after treated by 6.5% HNO3 for 1 min; (b) As a control test, the SERS substrate without graphene protection was measured under same conditions. The CV signal completely vanished after the etching by HNO3.

Mentions: Direct exposure of the silver-based SERS substrate to non-ideal environment may also cause degradation of SERS activity, due to the chemically instability of Ag. But, we found that the graphene-shield SERS substrate could be stable in those environments. Figure 5a shows the CV spectra on a graphene-shielded substrate after etching by concentrated HNO3 (6.5%) for 1 min, which did not show obvious decay. In contrast, the signal from the uncovered substrate completely vanished after etching (Fig. 5b). The above experiment clearly indicated that graphene can protect the SERS substrate against HNO3 etching. This feature may expand the use of SERS substrate in some non-ideal conditions, especially when corrosive reagents are involved.


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)

(a) Comparison of CV spectra from graphene-shielded SERS substrate before and after treated by 6.5% HNO3 for 1 min; (b) As a control test, the SERS substrate without graphene protection was measured under same conditions. The CV signal completely vanished after the etching by HNO3.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f5: (a) Comparison of CV spectra from graphene-shielded SERS substrate before and after treated by 6.5% HNO3 for 1 min; (b) As a control test, the SERS substrate without graphene protection was measured under same conditions. The CV signal completely vanished after the etching by HNO3.
Mentions: Direct exposure of the silver-based SERS substrate to non-ideal environment may also cause degradation of SERS activity, due to the chemically instability of Ag. But, we found that the graphene-shield SERS substrate could be stable in those environments. Figure 5a shows the CV spectra on a graphene-shielded substrate after etching by concentrated HNO3 (6.5%) for 1 min, which did not show obvious decay. In contrast, the signal from the uncovered substrate completely vanished after etching (Fig. 5b). The above experiment clearly indicated that graphene can protect the SERS substrate against HNO3 etching. This feature may expand the use of SERS substrate in some non-ideal conditions, especially when corrosive reagents are involved.

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