Page 103 - Organic Electronics in Sensors and Biotechnology

80 Cha pte r T w o

(a)

20 nm 20 nm 20 nm

d = 5.5 ± 2.2 nm d = 6.2 ± 1.6 nm d = 7.9 ± 1.0 nm
(b)
100
95
SPR peak FWHM (nm) 90

85
80
75
70
65
(c)
530
SPR peak position (nm) 526
528

524

522

–5 –4 –3 –2 –1 0
2
Current density (mA/cm )
FIGURE 2.10 (a) TEM micrographs of Au-NPs electrosynthesized at different current
densities in the presence of TOAC; the average core diameter was calculated over
more than 500 particles; (b) dependence of surface plasmon resonance (SPR) band
FWHM (Full Width at Half Maximum); and (c) position on the applied current density.
Current densities have been corrected by the process yield, namely, by the
percentage of the electrolysis charge effectively spent for the Au to Au-NPs
bulk
conversion. Data have been obtained as the mean value over at least three
replicate experiments. (Reprinted with permission from Ref. 201: E. Ieva and N. Cioffi ,
in Nanomaterials: New Research Developments, Egor I. Pertsov (ed.), Nova Science
Publishers, New York, 2008.)