156
8 Nanofabrication on Reactive Block Copolymer Film …
Fig. 8.6 a Pull-off force map (500 nm × 500 nm, forces increase from dark to bright contrast) and
two representative f-d curves (the position of these curves labeled x and y is located at the crossing of
the corresponding dotted lines) of cyclohexane-treated PS 690 -b-PtBA 1210 polymer films calculated
from the FV data, such as shown in Fig. 8.4. b Pull-off force distribution (again the data points x
and y refer to the ones schematically indicated in (a))
pull-off force values were observed for the PS matrix (e.g., point x in Fig. 8.6),
consistent with the higher surface energy of PS compared to PtBA leading to a
higher work of adhesion. The covalently attached fluoresceinamine rendered the
PtBA nanodomains hydrophobic, thus the low pull-off forces are associated with the
fluoresceinamine-rich nanodomains (e.g., point w in Fig. 8.7).
All data have been acquired in air using an unmodified, yet chemically distinct,
silicon nitride tip. In order to map and evaluate the lateral chemical composition of
these films quantitatively, CFM experiments under carefully controlled conditions
(incl. drift control) with an increased number of data points averaged in time (for
each position) and in plane are required. This kind of analysis is in principle possible,
but has not been performed yet.
8 Nanofabrication on Reactive Block Copolymer Film …
Fig. 8.6 a Pull-off force map (500 nm × 500 nm, forces increase from dark to bright contrast) and
two representative f-d curves (the position of these curves labeled x and y is located at the crossing of
the corresponding dotted lines) of cyclohexane-treated PS 690 -b-PtBA 1210 polymer films calculated
from the FV data, such as shown in Fig. 8.4. b Pull-off force distribution (again the data points x
and y refer to the ones schematically indicated in (a))
pull-off force values were observed for the PS matrix (e.g., point x in Fig. 8.6),
consistent with the higher surface energy of PS compared to PtBA leading to a
higher work of adhesion. The covalently attached fluoresceinamine rendered the
PtBA nanodomains hydrophobic, thus the low pull-off forces are associated with the
fluoresceinamine-rich nanodomains (e.g., point w in Fig. 8.7).
All data have been acquired in air using an unmodified, yet chemically distinct,
silicon nitride tip. In order to map and evaluate the lateral chemical composition of
these films quantitatively, CFM experiments under carefully controlled conditions
(incl. drift control) with an increased number of data points averaged in time (for
each position) and in plane are required. This kind of analysis is in principle possible,
but has not been performed yet.