whesound.blogg.se - O xps peak in cuo

The surfaces biocompatible for L929 cells showed various cytotoxicity for HeLa cells (10.8–5.3% of cell death), the highest for MNPs functionalized with oxalic acid. These modified properties of f-MNPs influenced their biological properties. The XPS analysis of elements and their chemical states at the surface of MNPs and f-MNPs revealed differences in chemical bonding of atoms, content of carbon–oxygen groups, iron oxide forms, iron oxide magnetic properties, adsorbed molecules, surface coverage, and overlayer thickness, whereas the Auger parameters (derived from XPS and Auger spectra) and elastic and inelastic scattering probabilities of electrons on atoms and valence band electrons (derived from REELS spectra) indicated modification of surface charge redistribution, electronic, and optical properties. Surfaces of iron oxide of ferrimagnetic magnetite (Fe 3O 4) nanoparticles (MNPs) prepared by Massart's method and their functionalized form (f-MNPs) with succinic acid, L-arginine, oxalic acid, citric acid, and glutamic acid were studied by dynamic light scattering (DLS), Fourier transform infrared spectroscopy (FTIR-S), UV-vis, thermogravimetric analysis (TGA)/differential scanning calorimetry (DSC), X-ray photoelectron spectroscopy (XPS), and reflection electron energy loss spectroscopy (REELS).

4Research Centre for Natural Sciences, Institute of Materials and Environmental Chemistry, Hungarian Academy of Sciences, Budapest, Hungary.

3Institute for Nuclear Research, Hungarian Academy of Sciences, Debrecen, Hungary.

2Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czechia.

1Institute of Physical Chemistry, Polish Academy of Sciences, Warsaw, Poland.

Indeed the 3rd attachment shows that all forms of Cu can be present at 600 C.Beata Lesiak 1 *, N. CuO decomposes) at higher partial pressures of O2 at 600 C. Indeed from the second attachment we see that Cu is the preferred state (i.e. Here you see, depending on the partial pressure of oxygen (and WO3 must affect this), a variety of forms of copper can be seen.

Why did you use this temperature? The phase diagram of copper and oxygen would be useful to study. This could be a catalyzed decomposition of CuO as well:Ħ00 C is a very high annealing' stage. From what you state, it appears that there is some reduction of your CuO by the WO3. You need to argon ion etch 10 or more atomic layer to see the bulk state of the material. The latter is used to calibrate the system taking into account charging.

Kavitha V S The surface (5 - 10 atomic layers) of every material in air when investigated by XPS will show high oyygen content, the element in its highest oxidation state (in your case Cu2+) and a large amount of carbon at 285 eV.