J. N. SILVA ET AL.
Copyright © 2013 SciRes. ANP
221
Table 2. Model fit analysis for the AgNPs synthesis.
Source Degree of freedom Sum of squares Mean square F-value P-value
Model 9 189,000 21005.32 6.01 0.0137
Residual 7 24447.83 3492.55
Lack of fit 3 24223.13 8074.38 143.74 0.0002
Pure error 4 224.70 56.17
Total 16 213,500
Table 3. Theoretical and experimental data for three ex-
periment realized to obtain silver nanoprisms at predicted
wavelengh values.
Run x1 (μL) x 2 (μL) x 3 (μL) λtheo. (nm) λexp. (nm)
1 50 55 192 600 ± 65.88 615 ± 31
2 35 56 200 700 ± 75.70 788 ± 25
3 35 50 153 800 ± 70.13 752 ± 42
neighbors, contributing to the enhancement of the local
excitation of these luminescent structures. These kinds of
materials are largely used for biological applications,
such as tissue and cells markers for diagnosis and other
studies [14].
4. Conclusion
Box-Behnken based experiments showed that it is possi-
ble to prepare silver nanoprisms with tunable wavelength.
This indicated a distinct size distribution for each sample
of silver nanoprisms synthesized. The interactions among
all chemical components (x1, x2, and x3) used in the ex-
periments were meaningful according to Table 2, however,
the x1 factor was the most important one. Statistic analy-
sis ANOVA of the model was significant and indicated a
good fitness with the data obtained. In order with fit of
model were chosen three points with wavelength pre-
dicted values. All results presented a good approximation
with predicted values.
5. Acknowledgements
This work was supported by Brazilian agencies CNPq
and CAPES, as well as INFo (Instituto de Fotônica). The
authors are grateful to CETENE for the use of Transmis-
sion Electronic Microscope.
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