How were the np's prepared? the reason am asking is because the preparation method plays a major role on the oxidation extent of Fe np's

Nevertheless, I used to sprinkle them on a small adhesive carbon disk that is used for the SEM. While for TEM I was dispersing them using ultrasonic shaker while in chloroform then adding a small drop to a small carbon disk (that is also made for the TEM). I remember a time were the SEM signal was weak because of oxidized surface, I was told that I can spray them with Ag to make it work for the SEM, but I didnt do it.

You can also check some of my publications here on RG for details about Fe np's SEM and TEM

Good luck

Dear Duckhwan Bae :

 Try to mix the nanoparticles with the PTFE powder under vacuum .Heat the mixture. Cool, Make the cut. Look at the microscope.

Best regards.

Hi Duckhwan,

To effectively carry out SEM characterization of any nano particle material especially Fe based, use non-reactive PTFE material such as Teflon as mount resin, Ag coat the selected cut out portion and for best micrograph use backscatter mode.

Good luck