Supplementary information
a
b
Figure S1. (a) Extinction spectrum (solid line) of after exposing 2 mL silver ND seed solution and
4 mL precursor for 6 hours and (b) FE-SEM the final product. Dash line is extinction spectrum of
ND seeds. Inset: halogen lamp emission spectrum.
We studied the enlargement of silver nanodecahedrons when a mixture of 3 mL ND
seed solution with LSPR at 489 nm and 3 mL precursor solution was illuminated by
white light (Fiber-Lite DC950 illuminator manufactured by Dolan-Jenner Industries)
for 9 hours. UV-Vis spectrum in Figure S1a shows that the longitudinal resonance
peak has shifted from 489 nm to 497 nm, which indicates an increase of the
nanodecahedrons size. However, a broad peak in the longer wavelength region has
emerged also. This peak is associated with silver nanoprisms and nanoplates as shown
in Figure S1b. The reason for our results is straightforward. Since halogen light
contains a wide spectrum particularly for the 500-750 nm region (as shown in the
inset of Figure S1a), the mixture received a range of photon energies that can induce
regrowth of silver NDs (LSP wavelength: 500-520 nm) as well as transformation of
small silver nanoparticles into nanoprisms and nanoplate (500-750 nm).
a
b
Figure S2. FDTD simulation results of electric field distribution around a 50 nm edge length
silver nanodecahedron irradiated by 540 nm light of unit amplitude with electric polarization
parallel with (a) longitudinal and (b) transverse of silver nanodecahedron. k is the direction of
irradiation light.
Figure S3. FE-SEM image of silver nanodecahedrons of large scale. Silver nanoprisms and
nanoplates are labeled with red circles.
489 nm
516 nm
522 nm
550 nm
572 nm
590 nm
Figure S4. Histograms showing the size distribution of silver nanodecahedrons that exhibit
different extinction peaks.
Figure S5. FE-SEM image of product irradiated by 578 nm LED.