Hi, you usually use the hydrothermal method to synthesize nanoparticles from precursors. On the other hand, ultrasonication is not a synthesis but only a mixing/dispersing procedure. If you already have your material, you should opt for ultrasonication. Alternatively, you may consider adding the polymer to your reactive mixture and synthesizing the nanoparticles in situ.

Some practical information about nanoparticle dispersion using ultrasonication:

Article Phase diagram of bare particles in polymer nanocomposites: U...

Article Thermodynamic Parameters Controlling Nanoparticle Spatial Pa...

Article Bulk Polymer Nanocomposites with Preparation Protocol Govern...

Example of in-situ nanoparticle synthesis:

Article Electrospinning of hyaluronan/polyvinyl alcohol in presence ...

Hi Shreya, A few methods for synthesizing Nanocomposite out of the intrinsic nanomaterials include hydrothermal, ultrasonication, and sol-gel methods. The links give a clear description of how to do it.

1. Solgel

Article Sol-Gel-Assisted Microwave-Derived Synthesis of Anatase Ag/T...

2. Ultrasonication

Article Ultra-fast NO2 Detection by MoS2 Nanoflakes at Room Temperature

Article Molybdenum Carbide Nanoflakes Synthesized Using a Facile Met...

3. Hydrothermal

https://www.sciencedirect.com/topics/chemistry/hydrothermal-method

@Gorthala Guruprasad Hey, I have prepared three different materials using these methods but my question is how can I prepare nanocomposite of these three materials prepared from different methods? What is the direct method to prepare composite of already prepared materials?

Petr Lepcio Thankyou so much for responding. I have three prepared powdered samples(Ferrite,Polymer and GO). Can I directly mix them in distilled water and ultrasonicate it to prepare nanocomposite of these three powdered samples? If not, Kindly suggest me another method.

Hello Shreya,

As mentioned, the composites can also be done using the aforementioned methods. Generally, Ultrasonication is preferable for the formation of nanocomposites. However, the method that we are using completely depends on the materials to make the composite.

Hi Shreya Sinha, you don't mention your polymer, but I assume it is water soluble. Then the answer is probably yes - both ferrite and graphene oxide are hydrophilic, but the exact outcome depends on other factors such as particle size, polymer molecular weight, and the mutual affinity between the polymer/particle/solvent. Only a narrow window of parameters yields individually dispersed particles, while small clusters or aggregates are the usual outcomes reported as "good dispersion" in the literature. See the Fig. 2 in this paper (already listed in my previous comment):

Article Phase diagram of bare particles in polymer nanocomposites: U...

Note that the drying speed is also important - the particles can aggregate when the drying is too slow.

Hi Shreya Sinha, since you already synthesized the material, the best and simplest way to make composites of these is high energy ball milling. however, the milling time, amount of material etc, have to find out with trial and error method.

Thankyou for giving your response Mewin Vincent

I will try this way and get back to you. Thankyou for giving your time Petr Lepcio