Dear experienced researcher,
I will briefly explain my experiment and then ask two questions I have.
The solution of particular interest is transition metal oxides (TMOs), especially Molybdenum Oxide MoO3. The way I prepare it by using solution synthesis method and thus the actual composition of molybdenum oxide is of the form HyMoOx. Theoretically speaking, the absorption of the HyMoOx should be varying with the change in the oxidation state of Mo, where MoO3 has lowest absorption while HyMoO2 will have more absorption due to reduced bandgap.
What I want to do is to use UV-VIS spectroscopy to characterize the form of the solution. Since, I have no experience in it, I want to go through some literature that uses the same technique to do this or something similar? I failed to find any useful papers about it, if there are, please share them to me?
Second, to characterize the absorption of the solution, a high transparent container should be used. Can any one share with me the high transparent glass container or other container are suitable for this experiment setup?
Regards,
Chenjin
You are more likely to detect differences in the valence state using 1st derivative analysis. But even then?...
Dear Sir. Concerning your issue about the study of inorganic solution composition, especially transition metal oxides (TMOs) by UV-VIS spectroscopy. The molecular approach used to investigate the different preparation steps of important catalytic systems, based on Mo, Ni, and Co. The first preparation step consists of impregnating oxide supports by aqueous solutions of transition-metal complexes (TMCs), called precursor complexes, and involves the liquid–solid (wet) interface. The following steps consist of thermal activation treatments, involving the gas–solid (dry) interface. The molecular approach is based on (i) the use of the TMC to monitor and probe the nature of its own interactions with the oxide support, (ii) the selection of the most appropriate techniques to monitor such interactions, and (iii) the design of experiments to identify and isolate the key parameters controlling the “TMC–oxide support” interactions. Physical techniques play a key role in the characterization of catalyst preparation both at the macroscopic [temperature-programmed reduction (TPR), X-ray diffraction (XRD)] and molecular [Raman, X-ray absorption near-edge spectroscopy–extended X-ray absorption fine structure XANES–(EXAFS), diffuse reflectance UV–vis] levels, particularly when they are used simultaneously. They give some insight into the structure of the species existing on the surface, with the oxide support behaving as a solid ligand, when exposed for a short time to the precursor complex solution or after thermal treatment, or, for longer contact times, as a reactant. I think the following below links may help you in your analysis:
http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.620.9841&rep=rep1&type=pdf
http://craftychemist.org/upload/Inorganic/Notes/CHEM4500/class%20activities/Electronic%20(Absorption)%20Spectra%20of%20%203d%20Transition%20Metal%20Complexes.pdf
http://www.chem.iitb.ac.in/~rmv/ch102/ic3.pdf
Thanks
it seems unlikely that you mean solution. As mentioned above the metal oxides will be present in form of dispersion (note the difference solution - thermodynamically stable 1 phase system, dispersion 2 phase system, thermodynamically unstable).
As you can read in many discussions here on Researchgate - spectra will depend on size distribution of particles.
- Badges
- Science method
- Similar topics
- Methodology
- Absorption Spectroscopy
- UV-Visible Spectroscopy