Biomedical Engineering Reference
In-Depth Information
3.0
(a)
(a)
Ag
2.5
(b)
SiO
2
@Ag
2.0
1.5
(b)
1.0
0.5
0.0
300
400
500
600
700
800
Wavelength(nm)
Figure 10.7
Surface plasmon resonance of SiO2@Ag core-shell nanocomposites.
0.8
(a) Au
(b) SiO2@Au
(a)
0.6
(b)
0.4
0.2
0.0
300
400
500
600
700
800
Wavelength (nm)
Figure 10.8
Surface plasmon resonance of SiO2@Au core-shell nanocomposites.
for 4 h. h e solution was centrifuged and the precipitate was washed with
water. Gold solution, NaOH and functionalized silica particles in water
were stirred at 75
C
for 10 min. h ese form the gold seeds with silica par-
ticles. Finally the above solution was centrifuged, washed with water and
redispersed in 40 mL water. Silica-gold seed solution and gold hydroxide
solution were mixed and stirred with NaBH4 [70]. Figure 10.8 represents
SPR peak of Au NPs and SiO
2
@Au core-shell NCs observed at 523 nm and
540 nm. It clearly shows red shit ing in band for SiO
2
@Au core-shell NCs
accompanied with broadening in peak.
