I synthesize silver nanoparticles. its liquid form and I used water. it is tough to dry and make powder form. please suggest to prepared a sample for SEM.
Have you tried solvent exchanging the nanoparticles into ethanol? Drying with nitrogen may work. I've used this method for cellulose fibers with reasonable success.
I've done a lot of this by TEM. I'd put 3-4 uls of the sample onto a TEM grid. The water would evaporate fairly quickly on the grid and then the grid would go into the TEM dry. I assume a small aliquot on a SEM stub would also dry fairly quickly.