A general approach to multicomponent metal-decorated crumpled reduced graphene oxide nanocomposites using a flame-based process
Mohammad M. Mohammadi, Shikuan Shao, Santosh S. Gunturi, Anirudh R. Raghavan, Naveshkaanth Alexander, Christopher M. Stafford, Raymond D. Buchner, Mark Swihart
A general approach to multicomponent metal-decorated crumpled reduced graphene oxide nanocomposites using a flame-based process Mohammad Moein Mohammadi1, Shikuan Shao1, Santosh Srivatsa Gunturi1, Anirudh Ravi Raghavan1, Naveshkaanth Alexander1, Christopher M. Stafford2, Raymond D. Buchner1, Mark T. Swihart1* 1Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, NY 14260, USA 2Materials Science and Engineering Division, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA *swihart [at] buffalo.edu Abstract A general approach for the synthesis of multicomponent metal-decorated crumpled reduced graphene oxide nanocomposites is introduced using a one-step, continuous flame-based process. Crumpled reduced graphene oxide Balls (CGB) are produced in a High Temperature Reducing Jet (HTRJ) reactor. The key advantage of the HTRJ system over common flame-based aerosol synthesis methods is the separation of flame and product formation zones, which allows synthesis of non-oxide nanomaterials that can be reduced by H2 in the presence of H2O. Thus, CGBs are simultaneously decorated with different transition metal nanoparticles including cobalt (Co), nickel (Ni), iron (Fe), and palladium (Pd). The HTRJ process enables rapid aerosol (gas phase) formation of metal-decorated crumpled reduced graphene oxide Balls (M-CGBs) with relatively high production rates from low-cost metal precursors and graphene oxide (GO) aqueous dispersions. Characterization techniques confirm the decoration of <5 nm binary and ternary alloy, non-oxide transition metal nanoparticles on the CGBs with controlled compositions. The nanostructures made by this process can be used as electrocatalysts for fuel cells, electrodes in batteries and supercapacitors, conductive inks for printed electronics, wastewater treatment, and many other applications where a graphitized carbon-metal nanomaterial is needed.