these are the TEM images of the bimetallic nanoparticles, what can be said about the particle shapes and the distribution of the two elements into each other's matrix?
It's difficult to say anything exactly. The support film spoils the quality of pictures.
The best methods for characterization of such specimens:
- HRTEM (with special sample preparation - sonic spraying to holed carbon film on the grid). It will be possible to measure the crystallographic parameters - lattice distance, etc.
- EDX for elements analysis.
- X-ray crystallographic methods.
Good luck!
It's difficult to say anything exactly. The support film spoils the quality of pictures.
The best methods for characterization of such specimens:
- HRTEM (with special sample preparation - sonic spraying to holed carbon film on the grid). It will be possible to measure the crystallographic parameters - lattice distance, etc.
- EDX for elements analysis.
- X-ray crystallographic methods.
Good luck!
As stated above, the only thing the TEM image can tell you here is that you seem to have made diamond/pyramidal shaped nanoparticles with a diameter of approximately 10-50 nm. As Mr. Korneev said above, HRTEM may tell you more about the porous nature of the supports/crystal structure if you are very careful in sample preparation and imaging. One suggestion for EDX would be to attempt not only average elemental totals for each particle but also to performa high resolution EDX mapping scans to try and determine where each element potentially sits within the structure, although it is likely that your particles may be too small for this sort of analysis to yield results due to the small size of the particles.
The particle size is around 30 nm. I assume the shapes of particle are plate with stacking faults that results hexagonal or triangular plate and singly twinned that result pyramidal. You can use software to distinguish of both metallics in different color. For example Au-component in red color and other in green .
thanks, Prof. Posman,
Will you please specify something about the software.
I mean when you collecting TEM image, or SEM with EDS you can ask for operator to depict each component in different color. Look attachment. I am sorry for mis info.
that's ok, I was only clarifying whether there is any separate software for this purpose.
@ Ayat - on 3rd picture you can see only interference fringes, e.g. Moire pattern which can not be used for lattice measurement.
@ Posman for EDS mapping in TEM the microscope should be set into scanning mode (STEM) and the theory about EDS in TEM is much more complicated as in SEM! If you already go into STEM mode, the HAADF (Z-contrast) method would be much more reliable as elemental EDS mapping.
you go for SAED pattern of HRTEM images then you can explain your data well. And try for to isolate clear magnification images.
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