Is there a standard protocol for doping nanoparticles on carbon? What are the prerequisites?
Adarsh Shetty There are many forms of carbon from diamond through coal to soot. So you need to be much more specific. However, routine hydrogenation catalysts such as 5% Pd on carbon are made and there are many recipes in the literature. These contain nano sized (< 100nm) metal particles on the support. Typically a method will involve impregnation of the C support with an appropriate precursor followed by a reduction technique. The latter step can be carried out in the dry (e.g. with hydrogen) or in the wet (e.g with hydrazine hydrate).
Alan F Rawle Dear sir, coal and soot forms of carbon are what I'm interested in. I wish to know how to dope magnesium ferrite nanoparticles on carbon, to be specific.
Adarsh Shetty
Prepare OH-soap surfactants of magnesium and iron together with carbon in the proportion of ferrite, filter the precipitate, dry, and then sinter. An example would be our method for producing ferites.
Article Magnetic properties of nickel ferrite nanoparticles prepared...
Article The structure and magnetic properties of cobalt ferrite nano...
Adarsh Shetty Doping usually means up to (say) 1 wt%. What is your desired ferrite loading?
Adarsh Shetty In the absence of a response from you (I trust you're well and not on vacation) then, for low levels of 'doping', I'd absorb the appropriate quantities of the (mixed) nitrates onto the support and calcine at the appropriate temperature in an inert atmosphere to form the ferrites. This usually requires a knowledge of the pore volume of the support in order to just saturate the pores with liquid before a drying and reduction or calcination stage.
Yuri Mirgorod Thank you for your inputs sir, can you tell me the significance of sintering and the optimal temperature required.
Alan F Rawle Sorry I didn't see your answer soon enough sir, was preoccupied for the past few days. Coming to your question and inputs, I am not yet decided on the quantity of doping but I would say it is on the low end. I am also going for a green synthesis route involving co-precipitation method, therefore I am using chloride salts instead of nitrate. But thank you for your suggestion sir.
Adarsh Shetty The chlorides are harder to decompose than the nitrates. You will always be left with intractable chloride (can’t be washed out) and this can act as a catalyst poison in some instances. I have experience of this phenomenon.
Adarsh Shetty For the calcination temperature then study the appropriate phase diagram. I assume you have experience of making ferrites previously.
One of the simplest methods of doing so is introduction of a dopant in onto the surface of a CNT or into the structure. The dopant affects the distribution of the electron charge of the nanotube when it is physically or chemically bonded with it
- Badges
- Science topic
- Similar topics
- Physical Sciences
- Materials Science
- Materials
- Carbon Materials
- Graphite
- Graphene