Page 63 - Synthesis of Functional Nanoparticles Using an Atmospheric Pressure Microplasma Process - LiangLiang Lin

Iron Oxide Nanoparticles Synthesis and Mechanism Study - a Proof-of-Concept Model Study
Glass holder with vaseline
Products and glass holder with vaseline
g-Fe2O3 or Fe3O4 a-Fe2O3
Carbon
(1 0 14)
Intensity (a.u.)
(1 1 3)
(1 0 3)
(0 0 10) (0 2 4)
(1 1 6)
(5 1 1) (4 4 0)
(2 2 0) (1 0 4)
(3 1 1)
10 20 30 40 50 60 70 80
2q (°)
Figure 3.9 XRD patterns of glass holder and Vaseline with/without nanoparticles
3.3.6 XPS Results
To confirm the chemical compositions and get information about valence state of iron ions, XPS analysis is applied. Figure 3.10 shows typical full range XPS spectra of nanoparticles deposited at 1.05 W and 2.27 W. We note that full range spectra under those two conditions are almost the same, indicating similarity in products composition for two levels of discharge power. In addition to prominent peaks of Fe, O and C elements, minor peaks of N and Si are also detected. Si signals can be ascribed to the glass fiber substrate, while it can be suggested that N peak are originated due to the absorption of N2 from atmosphere to nanoparticles during sample transfer process from the micro reactor to XPS instrument.
Figure 3.10 Full XPS spectra of nanoparticles prepared at power of 1.05 W and 2.27 W 51