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Combination of inverted pyramidal nanovoid with silver nanoparticles to obtain further enhancement and its detection for ricin.

Wang M, Wang B, Wu S, Guo T, Li H, Guo Z, Wu J, Jia P, Wang Y, Xu X, Wang Y, Zhang C - Nanoscale Res Lett (2015)

Bottom Line: We have obtained the surface-enhanced Raman scattering substrate by depositing silver nanoparticles on the surface of the inverted pyramidal nanovoid in order to improve the enhance effects.In order to test the SERS activity of the combined substrates, Rh6G and ricin toxin were used as Raman probes.Finite element method was employed to simulate electric field and induced charge distribution of the substrates, which have been used to explore the interaction between nanoparticles and nanovoid as well as mechanism of the great enhancement.

View Article: PubMed Central - PubMed

Affiliation: The MOE Key Laboratory of Weak Light Nonlinear Photonics, School of physics and Teda Applied Physics Institute, Nankai University, Tianjin, 300071 China.

ABSTRACT
We have obtained the surface-enhanced Raman scattering substrate by depositing silver nanoparticles on the surface of the inverted pyramidal nanovoid in order to improve the enhance effects. Experimental results showed that the combined substrate exhibited greater enhancement than the nanovoid substrate or nanoparticles. In order to test the SERS activity of the combined substrates, Rh6G and ricin toxin were used as Raman probes. Finite element method was employed to simulate electric field and induced charge distribution of the substrates, which have been used to explore the interaction between nanoparticles and nanovoid as well as mechanism of the great enhancement.

No MeSH data available.


SEM images of prepared samples. a and b are SEM images of the inverted pyramidal nanovoid substrate. The pithead boundary length of the nanovoid is about 1.41 ╬╝m, its depth 1 ╬╝m, and its period 2 ╬╝m. c and d are SEM images of the prepared silver nanoparticles by solvothermal method. e and f are SEM images of the combined substrate.
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Fig2: SEM images of prepared samples. a and b are SEM images of the inverted pyramidal nanovoid substrate. The pithead boundary length of the nanovoid is about 1.41 ╬╝m, its depth 1 ╬╝m, and its period 2 ╬╝m. c and d are SEM images of the prepared silver nanoparticles by solvothermal method. e and f are SEM images of the combined substrate.

Mentions: The nanostructure substrates used in this study were fabricated from (100) oriented silicon wafers. As shown in Figure 1b,c,e, after defining arrays of apertures by electron-beam lithography (EBL) on Cr mask, anisotropic KOH etching to the {111} planes and removing the mask, the inverted pyramidal nanovoid arrays were formed (Figure 1e). Apex angle of the nanovoid was fixed at 70.5° [26]. By adjusting etching time, the depth of the nanovoid can be controlled. A layer of gold with thickness of 200 nm was sputtered onto it. Scanning electron microscope (SEM) images of the inverted pyramidal nanovoid substrate are shown in Figure 2a,b.Figure 1


Combination of inverted pyramidal nanovoid with silver nanoparticles to obtain further enhancement and its detection for ricin.

Wang M, Wang B, Wu S, Guo T, Li H, Guo Z, Wu J, Jia P, Wang Y, Xu X, Wang Y, Zhang C - Nanoscale Res Lett (2015)

SEM images of prepared samples. a and b are SEM images of the inverted pyramidal nanovoid substrate. The pithead boundary length of the nanovoid is about 1.41 ╬╝m, its depth 1 ╬╝m, and its period 2 ╬╝m. c and d are SEM images of the prepared silver nanoparticles by solvothermal method. e and f are SEM images of the combined substrate.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385201&req=5

Fig2: SEM images of prepared samples. a and b are SEM images of the inverted pyramidal nanovoid substrate. The pithead boundary length of the nanovoid is about 1.41 ╬╝m, its depth 1 ╬╝m, and its period 2 ╬╝m. c and d are SEM images of the prepared silver nanoparticles by solvothermal method. e and f are SEM images of the combined substrate.
Mentions: The nanostructure substrates used in this study were fabricated from (100) oriented silicon wafers. As shown in Figure 1b,c,e, after defining arrays of apertures by electron-beam lithography (EBL) on Cr mask, anisotropic KOH etching to the {111} planes and removing the mask, the inverted pyramidal nanovoid arrays were formed (Figure 1e). Apex angle of the nanovoid was fixed at 70.5° [26]. By adjusting etching time, the depth of the nanovoid can be controlled. A layer of gold with thickness of 200 nm was sputtered onto it. Scanning electron microscope (SEM) images of the inverted pyramidal nanovoid substrate are shown in Figure 2a,b.Figure 1

Bottom Line: We have obtained the surface-enhanced Raman scattering substrate by depositing silver nanoparticles on the surface of the inverted pyramidal nanovoid in order to improve the enhance effects.In order to test the SERS activity of the combined substrates, Rh6G and ricin toxin were used as Raman probes.Finite element method was employed to simulate electric field and induced charge distribution of the substrates, which have been used to explore the interaction between nanoparticles and nanovoid as well as mechanism of the great enhancement.

View Article: PubMed Central - PubMed

Affiliation: The MOE Key Laboratory of Weak Light Nonlinear Photonics, School of physics and Teda Applied Physics Institute, Nankai University, Tianjin, 300071 China.

ABSTRACT
We have obtained the surface-enhanced Raman scattering substrate by depositing silver nanoparticles on the surface of the inverted pyramidal nanovoid in order to improve the enhance effects. Experimental results showed that the combined substrate exhibited greater enhancement than the nanovoid substrate or nanoparticles. In order to test the SERS activity of the combined substrates, Rh6G and ricin toxin were used as Raman probes. Finite element method was employed to simulate electric field and induced charge distribution of the substrates, which have been used to explore the interaction between nanoparticles and nanovoid as well as mechanism of the great enhancement.

No MeSH data available.