Does TEM technique give only bulk composition in a nanoparticle?

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Dillip kumar Mishra

Why dont use SEM-EDS or EPMA for the composition analysis?

Denis Korneev

For nanoparticles (diameter < 100 nm) EDS can give only average composition for system "particle's surface, core, substrate (film, etc.)".

Particles structure and composition (indirectly) can be resolved by HR-TEM and crystallographic methods.

Good luck!

Irfan Arif

Thank you everyone for your answers.

Does EDS give the average composition of the nanoparticles?Which techniques should I use if I want to separately quantify the surface compositon of say, Ag in the Ag-Au nanoparticle. Can I use SEM EDS for the same?

Dear Irfan, you can answer yourself for the question about SEM EDS. Just simulate electron trajectory in solid and compare with diameter of your particles with this software:

http://www.gel.usherbrooke.ca/casino/What.html

With SEM EDS you can only estimate the composition for bulk specimen (a lot of individual particles) and estimate their structure from the geometrical point of view (obviously, if the particles have similar shape and diameter). Such estimation will be extremely rough.