8 Magnetic Self-Assembling of Spherical Co Nanoparticles …
199
Fig. 8.11 SEM images obtained by depositing of fcc-cobalt nanoparticles obtained by the micellar
approach, on HOPG substrate at various temperatures: a 10 °C, c 25 °C, e 35 °C, g 45 °C. b, d,
f and h, corresponding diffractograms
e, g). For temperatures equal to 25, 35 and 45 °C, the average domain areas are
400, 1000 and 2500 μm
2 , respectively, and their thickness can reach 5 μm. SAXS
study clearly indicates a long-range fcc ordering of the NPs [59]. For instance, the
X-ray diffraction pattern of the sample obtained at 45 °C (Fig. 8.12) shows various
spots which coordinates, when compared to the theoretical values of various structures, correspond to an fcc structure [6]. At 25 °C, the (111) reflection shown in the
diffractogram (Fig. 8.11d) is intense and nearly resolution limited (i.e., 0.05 nm
−1 ),
indicating long-range ordering out of the plane. The interparticle distance is found
around 3.60 nm (Table 8.4). By increasing the temperature from 25 to 45 °C, the peak
with δq 1/2 decreases from 0.05 to 0.035 and 0.034 nm
−1 , respectively, and become
199
Fig. 8.11 SEM images obtained by depositing of fcc-cobalt nanoparticles obtained by the micellar
approach, on HOPG substrate at various temperatures: a 10 °C, c 25 °C, e 35 °C, g 45 °C. b, d,
f and h, corresponding diffractograms
e, g). For temperatures equal to 25, 35 and 45 °C, the average domain areas are
400, 1000 and 2500 μm
2 , respectively, and their thickness can reach 5 μm. SAXS
study clearly indicates a long-range fcc ordering of the NPs [59]. For instance, the
X-ray diffraction pattern of the sample obtained at 45 °C (Fig. 8.12) shows various
spots which coordinates, when compared to the theoretical values of various structures, correspond to an fcc structure [6]. At 25 °C, the (111) reflection shown in the
diffractogram (Fig. 8.11d) is intense and nearly resolution limited (i.e., 0.05 nm
−1 ),
indicating long-range ordering out of the plane. The interparticle distance is found
around 3.60 nm (Table 8.4). By increasing the temperature from 25 to 45 °C, the peak
with δq 1/2 decreases from 0.05 to 0.035 and 0.034 nm
−1 , respectively, and become