Limits...
Nanoimprint lithography of Al nanovoids for deep-UV SERS.

Ding T, Sigle DO, Herrmann LO, Wolverson D, Baumberg JJ - ACS Appl Mater Interfaces (2014)

Bottom Line: Deep-ultraviolet surface-enhanced Raman scattering (UV-SERS) is a promising technique for bioimaging and detection because many biological molecules possess UV absorption lines leading to strongly resonant Raman scattering.Here, Al nanovoid substrates are developed by combining nanoimprint lithography of etched polymer/silica opal films with electron beam evaporation, to give a high-performance sensing platform for UV-SERS.Enhancement by more than 3 orders of magnitude in the UV-SERS performance was obtained from the DNA base adenine, matching well the UV plasmonic optical signatures and simulations, demonstrating its suitability for biodetection.

View Article: PubMed Central - PubMed

Affiliation: Nanophotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge CB3 0HE, United Kingdom.

ABSTRACT
Deep-ultraviolet surface-enhanced Raman scattering (UV-SERS) is a promising technique for bioimaging and detection because many biological molecules possess UV absorption lines leading to strongly resonant Raman scattering. Here, Al nanovoid substrates are developed by combining nanoimprint lithography of etched polymer/silica opal films with electron beam evaporation, to give a high-performance sensing platform for UV-SERS. Enhancement by more than 3 orders of magnitude in the UV-SERS performance was obtained from the DNA base adenine, matching well the UV plasmonic optical signatures and simulations, demonstrating its suitability for biodetection.

No MeSH data available.


Related in: MedlinePlus

Surface morphology characterizationof POFs (a–c) before and (d–f) after ion milling. (a)SEM image of SiO2@PMMA@PEA POFs, scale bar is 1 μm;and (b) the corresponding reflection spectra, inset is the opticalimage of the POFs, scale bar is 100 μm. (c) AFM characterizationof the surface profile of the POFs with AFM image showing in the inset.Scale bar is 2 μm. Right Inset is zoomed region of the surfaceprofile. (d, e) Top and tilted views (0°,30°) of the POFsafter 3 min ion milling. Scale bars are 200 nm. (f) CorrespondingAFM characterization as c after 3 min ion milling.
© Copyright Policy
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4230348&req=5

fig1: Surface morphology characterizationof POFs (a–c) before and (d–f) after ion milling. (a)SEM image of SiO2@PMMA@PEA POFs, scale bar is 1 μm;and (b) the corresponding reflection spectra, inset is the opticalimage of the POFs, scale bar is 100 μm. (c) AFM characterizationof the surface profile of the POFs with AFM image showing in the inset.Scale bar is 2 μm. Right Inset is zoomed region of the surfaceprofile. (d, e) Top and tilted views (0°,30°) of the POFsafter 3 min ion milling. Scale bars are 200 nm. (f) CorrespondingAFM characterization as c after 3 min ion milling.

Mentions: When embedded in the POFs, the morphology of thearrays of silica nanospheres can only be identified with difficulty(Figure 1a). The POFs presents a blue structuralcolor (resonant at 480 nm) with maximum reflectivity of 35% (Figure 1b), which indicates very good ordering of the silicaspheres throughout the 3D array. The AFM image (inset of Figure 1c) shows very low contrast because the surface ofthe POF remains covered with PMMA/PEA although ordered arrays canstill be recognized. The height profile of the POF at this stage isvery flat with a feature height of only 1–2 nm (right insetof Figure 1c).


Nanoimprint lithography of Al nanovoids for deep-UV SERS.

Ding T, Sigle DO, Herrmann LO, Wolverson D, Baumberg JJ - ACS Appl Mater Interfaces (2014)

Surface morphology characterizationof POFs (a–c) before and (d–f) after ion milling. (a)SEM image of SiO2@PMMA@PEA POFs, scale bar is 1 μm;and (b) the corresponding reflection spectra, inset is the opticalimage of the POFs, scale bar is 100 μm. (c) AFM characterizationof the surface profile of the POFs with AFM image showing in the inset.Scale bar is 2 μm. Right Inset is zoomed region of the surfaceprofile. (d, e) Top and tilted views (0°,30°) of the POFsafter 3 min ion milling. Scale bars are 200 nm. (f) CorrespondingAFM characterization as c after 3 min ion milling.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4230348&req=5

fig1: Surface morphology characterizationof POFs (a–c) before and (d–f) after ion milling. (a)SEM image of SiO2@PMMA@PEA POFs, scale bar is 1 μm;and (b) the corresponding reflection spectra, inset is the opticalimage of the POFs, scale bar is 100 μm. (c) AFM characterizationof the surface profile of the POFs with AFM image showing in the inset.Scale bar is 2 μm. Right Inset is zoomed region of the surfaceprofile. (d, e) Top and tilted views (0°,30°) of the POFsafter 3 min ion milling. Scale bars are 200 nm. (f) CorrespondingAFM characterization as c after 3 min ion milling.
Mentions: When embedded in the POFs, the morphology of thearrays of silica nanospheres can only be identified with difficulty(Figure 1a). The POFs presents a blue structuralcolor (resonant at 480 nm) with maximum reflectivity of 35% (Figure 1b), which indicates very good ordering of the silicaspheres throughout the 3D array. The AFM image (inset of Figure 1c) shows very low contrast because the surface ofthe POF remains covered with PMMA/PEA although ordered arrays canstill be recognized. The height profile of the POF at this stage isvery flat with a feature height of only 1–2 nm (right insetof Figure 1c).

Bottom Line: Deep-ultraviolet surface-enhanced Raman scattering (UV-SERS) is a promising technique for bioimaging and detection because many biological molecules possess UV absorption lines leading to strongly resonant Raman scattering.Here, Al nanovoid substrates are developed by combining nanoimprint lithography of etched polymer/silica opal films with electron beam evaporation, to give a high-performance sensing platform for UV-SERS.Enhancement by more than 3 orders of magnitude in the UV-SERS performance was obtained from the DNA base adenine, matching well the UV plasmonic optical signatures and simulations, demonstrating its suitability for biodetection.

View Article: PubMed Central - PubMed

Affiliation: Nanophotonics Centre, Cavendish Laboratory, University of Cambridge , Cambridge CB3 0HE, United Kingdom.

ABSTRACT
Deep-ultraviolet surface-enhanced Raman scattering (UV-SERS) is a promising technique for bioimaging and detection because many biological molecules possess UV absorption lines leading to strongly resonant Raman scattering. Here, Al nanovoid substrates are developed by combining nanoimprint lithography of etched polymer/silica opal films with electron beam evaporation, to give a high-performance sensing platform for UV-SERS. Enhancement by more than 3 orders of magnitude in the UV-SERS performance was obtained from the DNA base adenine, matching well the UV plasmonic optical signatures and simulations, demonstrating its suitability for biodetection.

No MeSH data available.


Related in: MedlinePlus