I am working on PtCu bimetallic nano-particles, I have did TEM (attached file) kindly tell me the exact structure. I am new I don't know which type of structure it is.
Thanks
Usually this type has a gel. You need to calcine or dry the sample in a vacuum, and then look again. After this may appear nanoparticles.
Usually this type has a gel. You need to calcine or dry the sample in a vacuum, and then look again. After this may appear nanoparticles.
TEM analysis alone is not enough. Make clear what is the active form of the catalytic metals (ground state, oxides....). "One day in the library is equal to one month in lab"
Use multiple methods to find out what you have, use at least XRD, XPS, chemisorption, TPD or TPX (desorption, reduction, oxidation) and TEM/SEMin combination with metal-mapping. And finally to a reaction test and repeat the analyzes for the spent catalyst.
Crystals take several forms of crystalline and get used to the temperature and way of preparation whether crystals were pure or irregular.
(1). Your sample is too thick; you need to improve on your sample preparation. TEM imaging requires that you make your sample so thin that it is almost transparent; such that the light from the electron beam should go through. Where light is blocked, it produces a shadow, which appear as spots (the nanoparticles).
(2). I agree with my colleagues (Dr. Henrik Romar) that you need to supplement your analysis with other characterization techniques such as XRD analysis, which will tell you the real structure: as either body-centred (BCC) crystal structure; face-centred cubic (FCC) crystal structure or hexagonal closed packing (HCP) crystal structure.
(3). Listen to (Dr. Yuri Mirgorod) because you may need to calcine your sample to "burn off" the excessive support mass that is covering the nanoparticles. Massive amorphous material in your catalyst will interfere with the analysis and the instruments will fail to provide you with accurate data analysis.
Thank you so much all, especially, Sir Yuri Mirgorod, Sir Henrik Romar and Sir James Aluha, I will follow your kind suggestions. Thanks again for your precious time and suggestions.
What is your support material here? your TEM analysis is not too clear enough to give a conclusive structure answer to your particles. I will suggest you do a line scan analysis. This will tell you if your what a core-shell structure or an allow. You can refer to my paper in Applied Catalysis A. Article Applied Catalysis A: General
Hi Sir, Prince Amaniampong,
Thanks for your time and kind suggestions.
It is an alloy of PtCu. OK I will follow you.
- Badges
- Science topic
- Similar topics
- Filing