In synthesizing metal oxide nanoparticles, if the nanoparticles are calcinated at 400 oC. Then, is there a possibility of other functional groups (biomolecules of plant extract) in the FTIR spectrum of metal oxide nanoparticles?
Well, that depends what atmosphere your particles have been exposed to; if it's lab air, everything that floats around can end up on your sample.
Suresh K. Ghotekar After sintering at 4000C then your particles are no longer 'nano' - there are no separate, discrete, independent particles < 100 nm in such a system. In air, carbon-based materials or contaminants may be oxidized to CO2 or alternatively incorporated in an oxide matrix as carbonate. XPS will show the presence of significant C on the surface in all systems. Look for the C 1s peak at 285 eV. For more information on 'nano' and dispersion check out this webinar (registration required):
Dispersion and nanotechnology
https://www.malvernpanalytical.com/en/learn/events-and-training/webinars/W190528DispNanoMat
Especially look at the plot at 10:06 or so.
Thank you Alan F Rawle, Jürgen Weippert, and Nagaraju Shilpa for your quick reply.
Yes, it is possible that other functional groups from biomolecules present in the plant extract used for synthesizing metal oxide nanoparticles may appear in the FTIR spectrum of the nanoparticles. This is because the biomolecules in the plant extract can act as both reducing and capping agents during nanoparticle synthesis, and can be adsorbed onto the surface of the nanoparticles, resulting in the presence of their functional groups in the FTIR spectrum.
For example, in the case of green synthesis of metal oxide nanoparticles using plant extracts, the biomolecules present in the extract, such as flavonoids, phenols, and proteins, can contribute to the reduction and stabilization of the nanoparticles. The functional groups from these biomolecules, such as hydroxyl, amine, and carboxylic acid groups, can be detected in the FTIR spectrum of the nanoparticles.
Therefore, it's important to consider the presence of other functional groups in the FTIR spectrum of metal oxide nanoparticles synthesized using plant extracts, as they can affect the stability, reactivity, and other properties of the nanoparticles. It may also be necessary to perform further analyses, such as XPS or NMR spectroscopy, to identify the specific functional groups and their contributions to the nanoparticle synthesis and properties.
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