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Size-controlled aerosol synthesis of silver nanoparticles for plasmonic materials.

Harra J, Mäkitalo J, Siikanen R, Virkki M, Genty G, Kobayashi T, Kauranen M, Mäkelä JM - J Nanopart Res (2012)

Bottom Line: A spectrophotometer was used to measure the optical extinction spectra of the prepared samples, which contained particles with diameters of approximately 50, 90 and 130 nm.By controlling the particle size, the dipolar peak of the localized surface plasmon resonance was tuned between wavelengths of 398 and 448 nm.In addition, quadrupolar resonances were observed at shorter wavelengths as predicted by the simplified theoretical model used to characterize the measured spectra.

View Article: PubMed Central - PubMed

ABSTRACT
Aerosol techniques were used to synthesize spherical and monodisperse silver nanoparticles for plasmonic materials. The particles were generated with an evaporation-condensation technique followed by size selection and sintering with a differential mobility analyzer and a tube furnace, respectively. Finally, the nanoparticles were collected on a glass substrate with an electrostatic precipitator. The particle size distributions were measured with a scanning mobility particle sizer and verified with a transmission electron microscope. A spectrophotometer was used to measure the optical extinction spectra of the prepared samples, which contained particles with diameters of approximately 50, 90 and 130 nm. By controlling the particle size, the dipolar peak of the localized surface plasmon resonance was tuned between wavelengths of 398 and 448 nm. In addition, quadrupolar resonances were observed at shorter wavelengths as predicted by the simplified theoretical model used to characterize the measured spectra.

No MeSH data available.


Related in: MedlinePlus

Size distributions of size-selected silver particles sintered at different temperatures. The temperature of the tube furnace was 1,350 °C
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Fig3: Size distributions of size-selected silver particles sintered at different temperatures. The temperature of the tube furnace was 1,350 °C

Mentions: Size distributions of the size-selected and sintered particles were measured with the SMPS at sampling 2. Figure 3 shows typical examples of the particle size distributions for different sintering temperatures. When the sintering temperature was increased, the particle concentration decreased. In addition, the size distribution shifted to smaller particle sizes and became slightly narrower. However, at temperatures near the bulk melting point of silver (962 °C), the size distribution clearly broadened. It should also be noted that there is a second, much weaker, particle mode with a larger particle size. This mode partly merges into the main mode when the temperature is increased. These larger particles are most likely doubly charged by the radioactive source. Therefore, they have the same electrical mobility as the desired particles. This results in their selection in the DMA. In order to eliminate these particles and to narrow the size distribution before the collection, another DMA could be used after the sintering furnace for a second size selection. However, that might notably lower the particle concentration and lead to extended collection times.Fig. 3


Size-controlled aerosol synthesis of silver nanoparticles for plasmonic materials.

Harra J, Mäkitalo J, Siikanen R, Virkki M, Genty G, Kobayashi T, Kauranen M, Mäkelä JM - J Nanopart Res (2012)

Size distributions of size-selected silver particles sintered at different temperatures. The temperature of the tube furnace was 1,350 °C
© Copyright Policy
Related In: Results  -  Collection

Show All Figures
getmorefigures.php?uid=PMC3400035&req=5

Fig3: Size distributions of size-selected silver particles sintered at different temperatures. The temperature of the tube furnace was 1,350 °C
Mentions: Size distributions of the size-selected and sintered particles were measured with the SMPS at sampling 2. Figure 3 shows typical examples of the particle size distributions for different sintering temperatures. When the sintering temperature was increased, the particle concentration decreased. In addition, the size distribution shifted to smaller particle sizes and became slightly narrower. However, at temperatures near the bulk melting point of silver (962 °C), the size distribution clearly broadened. It should also be noted that there is a second, much weaker, particle mode with a larger particle size. This mode partly merges into the main mode when the temperature is increased. These larger particles are most likely doubly charged by the radioactive source. Therefore, they have the same electrical mobility as the desired particles. This results in their selection in the DMA. In order to eliminate these particles and to narrow the size distribution before the collection, another DMA could be used after the sintering furnace for a second size selection. However, that might notably lower the particle concentration and lead to extended collection times.Fig. 3

Bottom Line: A spectrophotometer was used to measure the optical extinction spectra of the prepared samples, which contained particles with diameters of approximately 50, 90 and 130 nm.By controlling the particle size, the dipolar peak of the localized surface plasmon resonance was tuned between wavelengths of 398 and 448 nm.In addition, quadrupolar resonances were observed at shorter wavelengths as predicted by the simplified theoretical model used to characterize the measured spectra.

View Article: PubMed Central - PubMed

ABSTRACT
Aerosol techniques were used to synthesize spherical and monodisperse silver nanoparticles for plasmonic materials. The particles were generated with an evaporation-condensation technique followed by size selection and sintering with a differential mobility analyzer and a tube furnace, respectively. Finally, the nanoparticles were collected on a glass substrate with an electrostatic precipitator. The particle size distributions were measured with a scanning mobility particle sizer and verified with a transmission electron microscope. A spectrophotometer was used to measure the optical extinction spectra of the prepared samples, which contained particles with diameters of approximately 50, 90 and 130 nm. By controlling the particle size, the dipolar peak of the localized surface plasmon resonance was tuned between wavelengths of 398 and 448 nm. In addition, quadrupolar resonances were observed at shorter wavelengths as predicted by the simplified theoretical model used to characterize the measured spectra.

No MeSH data available.


Related in: MedlinePlus