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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.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.

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.


FEM-simulated field and charge distribution. Near-field electric intensity and induced charge distribution of (a) the periodic inverted pyramidal nanovoid, (b) combined nanostructure, (f) horizontally placed silver nanoparticle dimer, (g) obliquely placed dimer, (h) single silver nanosphere, (i) silver nanosphere, and nanorod. The tilt angles of silver dimer in b and g are the same. c is enlarged from b. d and e display induced charge density distribution on the surface of the nanovoid right side wall, corresponding to nanovoids shown in a and b, respectively.
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Fig5: FEM-simulated field and charge distribution. Near-field electric intensity and induced charge distribution of (a) the periodic inverted pyramidal nanovoid, (b) combined nanostructure, (f) horizontally placed silver nanoparticle dimer, (g) obliquely placed dimer, (h) single silver nanosphere, (i) silver nanosphere, and nanorod. The tilt angles of silver dimer in b and g are the same. c is enlarged from b. d and e display induced charge density distribution on the surface of the nanovoid right side wall, corresponding to nanovoids shown in a and b, respectively.

Mentions: In order to explore the mechanism of the further enhancement property of the combined substrate, finite element method was employed to simulate the near-field electric field distribution of the substrate under light illumination. E-field distributions of solitary gold nanovoid substrate and silver nanoparticle dimer were also calculated for comparison. As shown in Figure 5a,b,f, the plane wave which polarizes along the x-axis is incident from the top. The wavelength is 785 nm, which is the typical laser wavelength of Raman spectroscopy. The diameters of silver nanospheres in Figure 5b,f-i are 80 nm. The pithead boundary length of pyramidal nanovoid in Figure 5a,b is set to be 1.41 μm, depth 1 μm, and period 2 μm, in accordance with the size of the experimental substrate as shown in Figure 2. In Figure 5, all the gaps between nanoparticles or nanoparticle and nanovoid surface are 10 nm. The maximum of the color bar in Figure 5a,b,f is set to 10 V/m, which is convenient for comparison.Figure 5


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)

FEM-simulated field and charge distribution. Near-field electric intensity and induced charge distribution of (a) the periodic inverted pyramidal nanovoid, (b) combined nanostructure, (f) horizontally placed silver nanoparticle dimer, (g) obliquely placed dimer, (h) single silver nanosphere, (i) silver nanosphere, and nanorod. The tilt angles of silver dimer in b and g are the same. c is enlarged from b. d and e display induced charge density distribution on the surface of the nanovoid right side wall, corresponding to nanovoids shown in a and b, respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig5: FEM-simulated field and charge distribution. Near-field electric intensity and induced charge distribution of (a) the periodic inverted pyramidal nanovoid, (b) combined nanostructure, (f) horizontally placed silver nanoparticle dimer, (g) obliquely placed dimer, (h) single silver nanosphere, (i) silver nanosphere, and nanorod. The tilt angles of silver dimer in b and g are the same. c is enlarged from b. d and e display induced charge density distribution on the surface of the nanovoid right side wall, corresponding to nanovoids shown in a and b, respectively.
Mentions: In order to explore the mechanism of the further enhancement property of the combined substrate, finite element method was employed to simulate the near-field electric field distribution of the substrate under light illumination. E-field distributions of solitary gold nanovoid substrate and silver nanoparticle dimer were also calculated for comparison. As shown in Figure 5a,b,f, the plane wave which polarizes along the x-axis is incident from the top. The wavelength is 785 nm, which is the typical laser wavelength of Raman spectroscopy. The diameters of silver nanospheres in Figure 5b,f-i are 80 nm. The pithead boundary length of pyramidal nanovoid in Figure 5a,b is set to be 1.41 μm, depth 1 μm, and period 2 μm, in accordance with the size of the experimental substrate as shown in Figure 2. In Figure 5, all the gaps between nanoparticles or nanoparticle and nanovoid surface are 10 nm. The maximum of the color bar in Figure 5a,b,f is set to 10 V/m, which is convenient for comparison.Figure 5

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.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.

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.