Dealing with the synthesis of Ag and Au nanoparticles on polymeric ion exchange matrices with evident plasmon and UV spectra.
Yes, absolutely. The differences in refractive index between the polymer stabiliser you are using and the usual solvent or ligand matrix in other preparations is very small, and UV-vis spectra will still give you a lot of information, in particular, if the particles are of Au and monodisperse between 3 and about 40 nm. Then you can get very good size estimates very fast from the spectra (see Haiss, W. et. al in Anal. Chem. a few years ago).
It depends on the way you do it and what do you measure.
Usually you will need a combination of techniques not only one: FTIR, SEM and XRD.
It is a valid assay. The peaks of Nanoparticles is of SPR, but more for further characterization follow HRTEM, FTIR.
It is indeed valid assay because both Au and Ag show SPR peaks at different wavelengths.
Yes, absolutely. The differences in refractive index between the polymer stabiliser you are using and the usual solvent or ligand matrix in other preparations is very small, and UV-vis spectra will still give you a lot of information, in particular, if the particles are of Au and monodisperse between 3 and about 40 nm. Then you can get very good size estimates very fast from the spectra (see Haiss, W. et. al in Anal. Chem. a few years ago).
Thank you all! The fact is that I use a solid polymer to support the nanoparticles on it! So it will be dealing with the idea of UV for NPs supported on solid polymeric matrices. I think this is a boundary feature , isn t it ?
If the polymer is clear and colorless, and if the particles do not aggregate inside the polymer, all the above should still be applicable. You could even take into account the refractive index of the polymer and get more accurate sizing results. I think the most critical points may be that the polymer may scatter (i.e. if it is not completely clear) and that there may be a shift in plasmon band due to particle aggregation, which is common in most polymers.
Yes. It is. It depence on that at least monomer absorbance wavelength or polymeric form of pruct will have absorb on Uv or not. with disapearing of monomer absorbace or created absorbace for product,you can follow reaction kinetics such as rate, molecular waight, reactivity ratios and can deduce that your product and oter parameter that affect on its kinetics.
It depends if polymer is sensitive to UV irradiation on not? UV some times even degrade polymers instead of synthesis as in thermoplastics, such as polypropylene, polyethylene, poly(methyl methacrylate) and aramids. UV absorption leads to chain degradation and loss of strength at sensitive points in the chain structure. They include tertiary carbon atoms, which in polypropylene occur in every repeat unit. The impact of UV on polymers is used in nanotechnology, transplantology, X-ray lithography and other fields for modification of properties (roughness, hydrophobicity) of polymer surfaces. For example, a poly(methyl methacrylate) surface can be smoothed by vacuum ultraviolet.
You can find a lot of relevant information in my recent review on nanoparticles in polymers as well as in the references of this paper. The review can be downloaded from here http://www.ipme.ru/e-journals/RAMS/no_13012/01_popok.html
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