Chemistry Reference
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Fig. 3.6 Cross sectional TEM images of the pHEMA + Ag
0
NP system before laser-induced
photochemical patterning (control samples). a
d Cross sections of different samples. The yellow,
red and blue dashed lines represent (i) the surface of the pHEMA matrix, (ii) the approximate
depth of Ag
0
NP penetration into the pHEMA matrix, and (iii) the pHEMA-PMMA interface. The
contrast and the brightness were increased to distinguish the Ag
0
NPs from the pHEMA matrix.
Scale bars = 2
-
µ
m
system after patterning. The yellow, red and blue dashed lines represent (i) the
surface of the pHEMA matrix, (ii) the approximate depth of Ag
0
NP penetration into
the pHEMA matrix, and (iii) the pHEMA-PMMA interface. The Ag
0
NPs can
penetrate
m into the polymer matrix. TEM generates less heat than SEM,
while allowing high-resolution imaging of Ag
0
NPs.
The TEM images were analysed to measure the NP size distribution before and
after laser-induced patterning. Standard deviation values for the diameter of the Ag
0
NPs before (Fig.
3.8
a, b) and after (Fig.
3.8
c, d laser patterning were 34
*
5
-
6
µ
±
23 nm
(n = 96) and 18
±
12 nm (n = 1162), respectively. Figure
3.8
e illustrates the
