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The synthesis of controlled shape nanoplasmonic silver-silica structures by combining sol-gel technique and direct silver reduction.

Ramanauskaite L, Snitka V - Nanoscale Res Lett (2015)

Bottom Line: The key point of the work was the usage of polyethylene glycol 400 (PEG 400) both as the pore former and reducing agent for silver ions.The results of UV-vis absorbance spectra have shown the high quality of plasmonic structures with plasmon resonance wavelength in the region between 470 and 480 nm.The synthesized silica films decorated with silver nanoparticles were tested as substrates for the surface-enhanced Raman spectroscopy (SERS) and showed an enhancement relative to micro-Raman of more than 200 times.

View Article: PubMed Central - PubMed

Affiliation: Research Center for Microsystems and Nanotechnology, Kaunas University of Technology, Studentu 65, LT-51369 Kaunas, Lithuania.

ABSTRACT
In this work, we have obtained nanoplasmonic silver structures deposited on the glass substrates by combining sol-gel technology and direct silver ion reduction on the film surfaces. The key point of the work was the usage of polyethylene glycol 400 (PEG 400) both as the pore former and reducing agent for silver ions. We have investigated the influence of PEG 400 amount on the formation of silver nanoparticles on the film surface. It was found that control of PEG 400 amount in the sols allows the creation of porous films with specific organized silver nanoparticles or clusters on the surface. Optical, morphological and structural characteristics of the structures were measured and studied. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used for nanostructure size and shape characterization. We were able to form a 40- to 200-nm-diameter ring-type, spherical and self-assembled nanoparticles on the film surface. The results of UV-vis absorbance spectra have shown the high quality of plasmonic structures with plasmon resonance wavelength in the region between 470 and 480 nm. The synthesized silica films decorated with silver nanoparticles were tested as substrates for the surface-enhanced Raman spectroscopy (SERS) and showed an enhancement relative to micro-Raman of more than 200 times.

No MeSH data available.


Related in: MedlinePlus

Morphological characterization of hybrid silica films by AFM. (a) A film prepared at a volume ratio of sol:PEG 1:0.05 after thermal treatment and (b) after exposure in silver nitrate solution for 17 h; (c) a film prepared at a volume ratio of sol:PEG 1:0.10 after thermal treatment and (d) after exposure in silver nitrate solution for 17 h; (e) a film prepared at a volume ratio of sol:PEG 1:0.15 after thermal treatment and (f) after exposure in silver nitrate solution for 17 h.
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Fig5: Morphological characterization of hybrid silica films by AFM. (a) A film prepared at a volume ratio of sol:PEG 1:0.05 after thermal treatment and (b) after exposure in silver nitrate solution for 17 h; (c) a film prepared at a volume ratio of sol:PEG 1:0.10 after thermal treatment and (d) after exposure in silver nitrate solution for 17 h; (e) a film prepared at a volume ratio of sol:PEG 1:0.15 after thermal treatment and (f) after exposure in silver nitrate solution for 17 h.

Mentions: Figure 5a,c,e shows the morphology of the silica films and the histograms of surface roughness. As it is seen from atomic force microscopy (AFM) measurements, the roughness of the silica films increases with increasing the concentration of PEG 400: they were equal to 18, 30 and 23 nm for the films prepared using lowest, middle and highest amount of PEG 400, respectively. Morphological characterization of the silver nanoparticle-decorated silica films revealed that the change of PEG 400 amount in the sol results in the different structures of AgNp formed on the film surfaces (Figure 5b,d,f). Silica films, prepared by using sol/PEG 400 ratio 1:0.05 (v:v), were decorated with nanosized silver rings, while the films prepared using sol/PEG 400 ratio 1:0.10 (v:v) were found to have spherical silver nanoparticles on the surface. The third type of the films sol/PEG 400 ratio 1:0.15 (v:v) was found to have the network of silver nanoparticles formed on the surface of the film. AFM height histograms showed the height distribution of silver nanoparticles of around 25, 70 and 150 nm for rings, spherical and self-assembled nanoparticle-decorated silica films, respectively.Figure 5


The synthesis of controlled shape nanoplasmonic silver-silica structures by combining sol-gel technique and direct silver reduction.

Ramanauskaite L, Snitka V - Nanoscale Res Lett (2015)

Morphological characterization of hybrid silica films by AFM. (a) A film prepared at a volume ratio of sol:PEG 1:0.05 after thermal treatment and (b) after exposure in silver nitrate solution for 17 h; (c) a film prepared at a volume ratio of sol:PEG 1:0.10 after thermal treatment and (d) after exposure in silver nitrate solution for 17 h; (e) a film prepared at a volume ratio of sol:PEG 1:0.15 after thermal treatment and (f) after exposure in silver nitrate solution for 17 h.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385275&req=5

Fig5: Morphological characterization of hybrid silica films by AFM. (a) A film prepared at a volume ratio of sol:PEG 1:0.05 after thermal treatment and (b) after exposure in silver nitrate solution for 17 h; (c) a film prepared at a volume ratio of sol:PEG 1:0.10 after thermal treatment and (d) after exposure in silver nitrate solution for 17 h; (e) a film prepared at a volume ratio of sol:PEG 1:0.15 after thermal treatment and (f) after exposure in silver nitrate solution for 17 h.
Mentions: Figure 5a,c,e shows the morphology of the silica films and the histograms of surface roughness. As it is seen from atomic force microscopy (AFM) measurements, the roughness of the silica films increases with increasing the concentration of PEG 400: they were equal to 18, 30 and 23 nm for the films prepared using lowest, middle and highest amount of PEG 400, respectively. Morphological characterization of the silver nanoparticle-decorated silica films revealed that the change of PEG 400 amount in the sol results in the different structures of AgNp formed on the film surfaces (Figure 5b,d,f). Silica films, prepared by using sol/PEG 400 ratio 1:0.05 (v:v), were decorated with nanosized silver rings, while the films prepared using sol/PEG 400 ratio 1:0.10 (v:v) were found to have spherical silver nanoparticles on the surface. The third type of the films sol/PEG 400 ratio 1:0.15 (v:v) was found to have the network of silver nanoparticles formed on the surface of the film. AFM height histograms showed the height distribution of silver nanoparticles of around 25, 70 and 150 nm for rings, spherical and self-assembled nanoparticle-decorated silica films, respectively.Figure 5

Bottom Line: The key point of the work was the usage of polyethylene glycol 400 (PEG 400) both as the pore former and reducing agent for silver ions.The results of UV-vis absorbance spectra have shown the high quality of plasmonic structures with plasmon resonance wavelength in the region between 470 and 480 nm.The synthesized silica films decorated with silver nanoparticles were tested as substrates for the surface-enhanced Raman spectroscopy (SERS) and showed an enhancement relative to micro-Raman of more than 200 times.

View Article: PubMed Central - PubMed

Affiliation: Research Center for Microsystems and Nanotechnology, Kaunas University of Technology, Studentu 65, LT-51369 Kaunas, Lithuania.

ABSTRACT
In this work, we have obtained nanoplasmonic silver structures deposited on the glass substrates by combining sol-gel technology and direct silver ion reduction on the film surfaces. The key point of the work was the usage of polyethylene glycol 400 (PEG 400) both as the pore former and reducing agent for silver ions. We have investigated the influence of PEG 400 amount on the formation of silver nanoparticles on the film surface. It was found that control of PEG 400 amount in the sols allows the creation of porous films with specific organized silver nanoparticles or clusters on the surface. Optical, morphological and structural characteristics of the structures were measured and studied. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) were used for nanostructure size and shape characterization. We were able to form a 40- to 200-nm-diameter ring-type, spherical and self-assembled nanoparticles on the film surface. The results of UV-vis absorbance spectra have shown the high quality of plasmonic structures with plasmon resonance wavelength in the region between 470 and 480 nm. The synthesized silica films decorated with silver nanoparticles were tested as substrates for the surface-enhanced Raman spectroscopy (SERS) and showed an enhancement relative to micro-Raman of more than 200 times.

No MeSH data available.


Related in: MedlinePlus