Iron oxide nanoparticles are coated with citric acid and the XRD patterns analysed before and after coating with citric acid. The only difference was in intensity which decrease after coating. What could be the possible reason?
Dear Rozita Nasiri and Tasawar Javed
Several XRD studies backed up by SEM analysis, energy dispersive spectrometry and other techniques have established that peak intensity is directly related to the extent of crystallization. I have in the past perused a number of those papers. One particular one that explicitly mentions this is temperature studies of a magnetic material (read the second last sentence of the paper's abstract). You may download it at http://dx.doi.org/10.1016/j.jmmm.2012.12.047
I hope that you will find it useful.
An increased peak intensity might also imply an increase in the extent of crystallinity of your sample.
Dear Rozita Nasiri and Tasawar Javed
Several XRD studies backed up by SEM analysis, energy dispersive spectrometry and other techniques have established that peak intensity is directly related to the extent of crystallization. I have in the past perused a number of those papers. One particular one that explicitly mentions this is temperature studies of a magnetic material (read the second last sentence of the paper's abstract). You may download it at http://dx.doi.org/10.1016/j.jmmm.2012.12.047
I hope that you will find it useful.
Well.. Ocaya
I think the coating (citric acid) leading to the lower crystanility of your Iron Oxide. I have an experience on coating my iron oxide (magenetite, Fe3O4) with silica (SiO2), its intesity also get decreasing after coating....
You may download my paper on my forum.
In my opinion, I believe that the coating function of citric acid is occuring. Similar or almost equal amounts of your samples during XRD test, would give a you an idea of how much is the decrease in the peaks signals of the samples. Other factors to take into account have been described previously. Finally, you said that you observed a decrease in your signal, but did you observe change in position (displacement) of peaks? Cheers. Tomas Madera.
I agree with all above. But some time peaks shift can also happen due to instrument or the conditions given for analysis. I have observed during my work that even you used the same amount of materials some time peak shift occurs. This might be due to the instrumental error.
In this case I recommend that you should do the same analysis once again. If you get the decrease/increase in peaks intensity then it is related to materials crystalinity as mentioned above.
Good luck
What does citric acid do to the Fe2O3 nano particles?
Does it possibly etch the surface and create etch pits? Reduce the diffracting volume?
Dear Ravi
I know that citric acid coats iron oxide nanoparticles and it has effect on crystallinity because it comes to the surface and decreases the crystallinity of NPs, but I am not sure that it covers whole of NPs or it just makes branching attachment to the NPs. If anyone knows about it then I would be very thankful to share it with us here.
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science