I have synthesized nanoparticles by plants extracts. Then centrifuged and the pellet was dried (sample 1) and the supernatant was also dried (sample 2). Now XRD of sample 1 don't give any sharp peak but sample 2 gave a very sharp clear peak. On the other hand SEM image of sample 1 showed the formation of nanoparticle while sample 2 didn't show any nanoparticle. What may be the reason can anyone help me out?
Dear Rajesh
There are to points here:
1. Why you did not get nano-particles in sample 2? (unfortunately I can't help you)
2. Why you did not get sharp peaks for sample 1?
This phenomenon is normal. Generally, refinement of particles to nano size leads to broadening of XRD peaks.
You had sample 1 of organic matter, such as fiber. It will not give a clear peak of XRD, because it does not have a regular crystalline structure. But SEM can show the presence of particles. In another sample, there is a peak XRD. Consequently, there is a regular crystal structure, but the nanoparticles are small and their device does not "see."
@Yuri Mirgorod
Dear sir, in the SEM image of my sample 1, I got all the particle of approx. size (average) 200nm. I believe that having organic matter in the sample, I could have get larger sized materials i.e., of the organic matters. But I didn't get any large material in the SEM image. Can you help me out, sharing your views in this regard?
You had an extract. You apparently filtered it, and then dried it and got a photo on the SЕM. Large particles were on the filter.
Yes sir, but the filtration was done through a whatmann no 1 filter paper having pore size of 11 micrometre. So I should get particle size below 11 micrometre but the particle size here I got are too small i.e., 200nm only. So it is supposed that these particle are of my nanoparticles only, and if so, these must be of my targeted metal nanoparticle, then why I didn't get the XRD peak ?
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