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Naturally inspired SERS substrates fabricated by photocatalytically depositing silver nanoparticles on cicada wings.

Tanahashi I, Harada Y - Nanoscale Res Lett (2014)

Bottom Line: In the optical absorption spectra of the Ag/TiO2-coated wings, the absorption peak due to the localized surface plasmon resonance (LSPR) of Ag nanoparticles was observed at 440 nm.Strong Surface-enhanced Raman scattering (SERS) signals of Rhodamine 6G adsorbed on the Ag/TiO2-coated wings were clearly observed using the 514.5-nm line of an Ar(+) laser.The Ag/TiO2-coated wings can be a promising candidate for naturally inspired SERS substrates.

View Article: PubMed Central - HTML - PubMed

Affiliation: Nanomaterials and Microdevices Research Center, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan.

ABSTRACT
Densely stacked Ag nanoparticles with an average diameter of 199 nm were effectively deposited on TiO2-coated cicada wings (Ag/TiO2-coated wings) from a water-ethanol solution of AgNO3 using ultraviolet light irradiation at room temperature. It was seen that the surfaces of bare cicada wings contained nanopillar array structures. In the optical absorption spectra of the Ag/TiO2-coated wings, the absorption peak due to the localized surface plasmon resonance (LSPR) of Ag nanoparticles was observed at 440 nm. Strong Surface-enhanced Raman scattering (SERS) signals of Rhodamine 6G adsorbed on the Ag/TiO2-coated wings were clearly observed using the 514.5-nm line of an Ar(+) laser. The Ag/TiO2-coated wings can be a promising candidate for naturally inspired SERS substrates.

No MeSH data available.


Related in: MedlinePlus

SERS spectra. R6G adsorbed on the (a) bare cicada wing, (b) Ag/wing, (c) Ag/TiO2-coated wing, and (d) Ag film on a glass slide.
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Figure 4: SERS spectra. R6G adsorbed on the (a) bare cicada wing, (b) Ag/wing, (c) Ag/TiO2-coated wing, and (d) Ag film on a glass slide.

Mentions: SERS spectra of R6G adsorbed on the (a) bare cicada wing, (b) Ag/wing, and (c) Ag/TiO2-coated wing are shown in Figure 4. In this SERS measurement, R6G as standard remarks was adsorbed on the surface at the center of the dorsal forewings with an area of about 54 mm2. The SERS spectrum of R6G adsorbed on the (d) Ag film deposited on a glass slide prepared by sputtering is also shown in Figure 4. In the case of the (d) Ag film, the R6G-adsorbed area was about 50 mm2 which was almost the same as those of the (a) bare cicada wing, (b) Ag/wing, and (c) Ag/TiO2-coated wing. In the figure, R6G adsorbed on the (a) bare cicada wing shows no distinct peaks. A broad band of the spectrum from 600 to 1,800 cm-1 was due to the photoluminescence of R6G. On the other hand, R6G adsorbed on the (b) Ag/wing, (c) Ag/TiO2-coated wing, and (d) Ag film show the distinct SERS peaks. In Figure 4, the observed Raman bands seen in the (b) Ag/wing, (c) Ag/TiO2-coated wing, and (d) Ag film are assigned to R6G include ν(C-H) out-of-plane bend mode at ca. 774 cm-1, ν(C-H) in-plane bend mode at ca. 1,129 cm-1, ν(C-C) stretching mode at ca. 1,358, 1,505, and 1,649 cm-1[7,19]. The peak intensities of R6G adsorbed on the (a) bare cicada wing, (d) Ag film, (b) Ag/wing, and (c) Ag/TiO2-coated wing became large in that order. The peak intensity of R6G at 1,649 cm-1 of the (c) Ag/TiO2-coated wing was 36 times larger than that of the (d) Ag film and it was 6 times larger than that of the (b) Ag/wing. From the results of SEM and XRD of the bare cicada wings, Ag/wings, Ag/TiO2-coated wings, and Ag films, SERS properties of these samples are mainly influenced by the nanostructures of their surfaces.


Naturally inspired SERS substrates fabricated by photocatalytically depositing silver nanoparticles on cicada wings.

Tanahashi I, Harada Y - Nanoscale Res Lett (2014)

SERS spectra. R6G adsorbed on the (a) bare cicada wing, (b) Ag/wing, (c) Ag/TiO2-coated wing, and (d) Ag film on a glass slide.
© Copyright Policy - open-access
Related In: Results  -  Collection

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Show All Figures
getmorefigures.php?uid=PMC4060861&req=5

Figure 4: SERS spectra. R6G adsorbed on the (a) bare cicada wing, (b) Ag/wing, (c) Ag/TiO2-coated wing, and (d) Ag film on a glass slide.
Mentions: SERS spectra of R6G adsorbed on the (a) bare cicada wing, (b) Ag/wing, and (c) Ag/TiO2-coated wing are shown in Figure 4. In this SERS measurement, R6G as standard remarks was adsorbed on the surface at the center of the dorsal forewings with an area of about 54 mm2. The SERS spectrum of R6G adsorbed on the (d) Ag film deposited on a glass slide prepared by sputtering is also shown in Figure 4. In the case of the (d) Ag film, the R6G-adsorbed area was about 50 mm2 which was almost the same as those of the (a) bare cicada wing, (b) Ag/wing, and (c) Ag/TiO2-coated wing. In the figure, R6G adsorbed on the (a) bare cicada wing shows no distinct peaks. A broad band of the spectrum from 600 to 1,800 cm-1 was due to the photoluminescence of R6G. On the other hand, R6G adsorbed on the (b) Ag/wing, (c) Ag/TiO2-coated wing, and (d) Ag film show the distinct SERS peaks. In Figure 4, the observed Raman bands seen in the (b) Ag/wing, (c) Ag/TiO2-coated wing, and (d) Ag film are assigned to R6G include ν(C-H) out-of-plane bend mode at ca. 774 cm-1, ν(C-H) in-plane bend mode at ca. 1,129 cm-1, ν(C-C) stretching mode at ca. 1,358, 1,505, and 1,649 cm-1[7,19]. The peak intensities of R6G adsorbed on the (a) bare cicada wing, (d) Ag film, (b) Ag/wing, and (c) Ag/TiO2-coated wing became large in that order. The peak intensity of R6G at 1,649 cm-1 of the (c) Ag/TiO2-coated wing was 36 times larger than that of the (d) Ag film and it was 6 times larger than that of the (b) Ag/wing. From the results of SEM and XRD of the bare cicada wings, Ag/wings, Ag/TiO2-coated wings, and Ag films, SERS properties of these samples are mainly influenced by the nanostructures of their surfaces.

Bottom Line: In the optical absorption spectra of the Ag/TiO2-coated wings, the absorption peak due to the localized surface plasmon resonance (LSPR) of Ag nanoparticles was observed at 440 nm.Strong Surface-enhanced Raman scattering (SERS) signals of Rhodamine 6G adsorbed on the Ag/TiO2-coated wings were clearly observed using the 514.5-nm line of an Ar(+) laser.The Ag/TiO2-coated wings can be a promising candidate for naturally inspired SERS substrates.

View Article: PubMed Central - HTML - PubMed

Affiliation: Nanomaterials and Microdevices Research Center, Osaka Institute of Technology, 5-16-1 Omiya, Asahi-ku, Osaka 535-8585, Japan.

ABSTRACT
Densely stacked Ag nanoparticles with an average diameter of 199 nm were effectively deposited on TiO2-coated cicada wings (Ag/TiO2-coated wings) from a water-ethanol solution of AgNO3 using ultraviolet light irradiation at room temperature. It was seen that the surfaces of bare cicada wings contained nanopillar array structures. In the optical absorption spectra of the Ag/TiO2-coated wings, the absorption peak due to the localized surface plasmon resonance (LSPR) of Ag nanoparticles was observed at 440 nm. Strong Surface-enhanced Raman scattering (SERS) signals of Rhodamine 6G adsorbed on the Ag/TiO2-coated wings were clearly observed using the 514.5-nm line of an Ar(+) laser. The Ag/TiO2-coated wings can be a promising candidate for naturally inspired SERS substrates.

No MeSH data available.


Related in: MedlinePlus