Dear friend Siddhartha Dan

Manganese-doped graphene oxide can be synthesized by a variety of methods. One study reported the synthesis of manganese dioxide/reduced graphene oxide composite electrodes using physical mixing, microwave-assisted method, chemical co-precipitation and electrochemical deposition (Fabrication of manganese oxide@nitrogen doped graphene oxide). Another study reported the synthesis of manganese-doped chromium sulfide with reduced graphene oxide (Mn-doped Cr2S3/rGO) by hydrothermal process (Structure and synthesis of graphene oxide).

I found a reference that describes the synthesis of graphene oxide from purified natural graphite by a modified Hummers method (Manganese dioxide/ reduced graphene oxide composite an electrode).

More notes on Hummers' method

The **Hummers' method** is a widely used method for preparing graphene oxide (Hummers' method - Wikipedia). The method involves the oxidation of graphite to introduce oxygen molecules to pure carbon graphene. The reaction occurs between graphene and concentrated sulfuric acid with potassium permanganate and sodium nitrate acting as catalysts (Hummers' method - Wikipedia). The process yields approximately 188 g of graphite oxide to 100 g of graphite used (Hummers' method - Wikipedia).

An improved method for preparing graphene oxide involves excluding NaNO3, increasing the amount of KMnO4, and performing the reaction in a 9:1 mixture of H2SO4/H3PO4 (Improved Synthesis of Graphene Oxide).

A safer modified Hummers' method for the synthesis of graphene oxide with fewer toxic chemicals has also been developed. This method includes all former developments but with key improvements. It consists of carrying out a reaction of graphite powder with KMnO4 and NaNO3 in concentrated H2SO4 (Safer modified Hummers' method for the synthesis of graphene oxide with fewer toxic chemicals).

In one study, graphene oxide was successfully prepared by oxidizing purified natural flake graphite (NPG) by a modified Hummer’s method. GO was later thermally reduced to synthesize reduced GO (rGO). The GO synthesized by the modified Hummer’s method was found to consist of stacks of GO sheets. These stacks were found to have a thickness of about 1 - 2 μm (Synthesis of Graphene Oxide (GO) by Modified Hummers' Method).

I hope this information helps you. Please let me know if you have any other questions. I would welcome any collaboration possibility.

You may want to read my own articles on this subject.

Preprint Hierarchical NiMn Double Layered/Graphene with Excellent Ene...

Chapter Synthesis Of Manganese Oxide Nanoparticles Using Similar Pro...

References:

1. Manganese dioxide/ reduced graphene oxide composite an electrode .... https://www.sciencedirect.com/science/article/pii/S0013468618329049.

2. Facile hydrothermal synthesis of manganese-doped chromium ... - Springer. https://link.springer.com/article/10.1557/s43578-023-00977-z.

3. Method for the synthesis of graphene oxide - Google Patents. https://patents.google.com/patent/US10336619B2/en.

4. Improved Synthesis of Graphene Oxide | ACS Nano. https://pubs.acs.org/doi/10.1021/nn1006368.

5. Fabrication of manganese oxide@nitrogen doped graphene oxide .... https://www.sciencedirect.com/science/article/pii/S2238785419309627.

6. Structure and synthesis of graphene oxide - ScienceDirect. https://www.sciencedirect.com/science/article/pii/S1004954119301508.

7. Synthesis and electrical properties of graphene–manganese oxide hybrid .... https://link.springer.com/article/10.1007/s10854-021-07676-7.

8. Facile sonochemical synthesis of silver nanoparticle and graphene oxide .... https://www.sciencedirect.com/science/article/pii/S0966979521000182.

9. Hummers' method - Wikipedia. https://en.wikipedia.org/wiki/Hummers%27_Method.

10. Safer modified Hummers' method for the synthesis of graphene oxide with .... https://iopscience.iop.org/article/10.1088/2053-1591/ab4cbf.

11. Synthesis of Graphene Oxide (GO) by Modified Hummers' Method ... - LinkedIn. https://www.linkedin.com/pulse/synthesis-graphene-oxide-go-modified-hummers-method-oukil.

12. Facile synthesis of reduced graphene oxide by modified Hummer's method .... https://royalsocietypublishing.org/doi/10.1098/rsos.181978.

13. Synthesis of Graphene Oxide using Modified Hummers Method: Solvent .... https://www.sciencedirect.com/science/article/pii/S1877705817316235.

Dear colleague

I just can recommand you to contact my colleague Professor Khalid Lafdi who works from a long time on graphene and carbon material. He was teached by Dr Agnès Oberlin who was a leading scientific on carbon from year's 60 to 90.

Best regards

Dear Siddhartha Dan,

Check out this paper on the synthesis of MnO2-Graphene Oxide Composite through a self-assembly method.

Article Nanometric MnO2 and MnO2‐Graphene Oxide Materials Enabled by...

Regards