Summer intern Reportsynthesis and characterization of iron oxide dispersed Graphene nanocomposite

-mitul rawat (12216013)iit roorkee

Iron Oxide Nanocomposites Wide spread applications of Iron Oxide nanocomposites, include using

different forms of carbon e.g.: activated carbon, carbon doping, carbon nanotubes, fullerenes, graphene, thin layer carbon coating, Nano metric carbon black and carbon in different morphologies.

GO is used due to the availability of various functional groups .Iron oxide (Fe3O4/ Fe) possesses a unique position due to its considerably high saturation

magnetization (87 emu/g), interesting electronic transport properties and above all high bio-compatibility.

Spinel cubic structure of Fe- Fe3O4 are useful for photocatalytic splitting of water

CO2 Reduction Several potential catalysts that are able to reduce CO2 electrochemically in aqueous

electrolytes. Wustite has higher activity of decomposing CO2 to carbon than that of oxygen-deficient

magnetite.

Energy Storage, Medical, Sensing, Catalytic, and Environmental Applications Due to good Magnetic Properties.Drug carriers due to their large surface areas, stability for the adsorption of biomolecules, and

capability to control their motion inside the bloodstream by applying an external magnetic field.

As Anode Materials in LiBs: adsorption of electrolyte ions on the electrode surface Magnetite/graphene composite could be used to effectively remove 99.9% of As(III) and As(V)

from contaminated water : removed from the solvent phase by application of an external magnetic field; additionally using MnO2 with the magnetite/ graphene material As+3 to +5.

Detection of tert-butyl hydroperoxide- haemoglobin : Immobilization of the biomolecules

Energy Storage, Medical, Sensing, Catalytic, and Environmental Applications Excellent adsorption performance toward Cr(VI) : involving reduction of Cr(VI) to Cr(III) and ion

exchange between the hydroxyl groups and Cr /HCrO4 ion. Jiang et al used Fe/graphene nanosheets as H2S sensor.Magnetic graphene as an MRI agent was proposed by Cong et al.Designed iron oxide/poly(lactic acid)/ graphene oxide nanocomposite effectively kills the

cancer cells photosensitive semiconductor electrode : R-Fe (hematite ) suitable band gap

Synthesis

Vander Waal & Covalent Bonding Multistep- synthesis of graphene by reduction of graphite oxide and/or graphene oxide, surface

modification and preparation of iron oxide nanoparticles, and then mixing them with surface-functionalized graphene.

Solution deposition of an Fe(III) salt or Fe(II) complexes onto graphene oxide/reduced Graphene Oxide.

Graphene oxide has a variety of oxygen-containing functional groups on its surface, including epoxy (C_O_C), hydroxyl (OH), and carboxyl (COOH) groups

Synthesis of reduced Graphene Oxide

Add 1 g of graphite in 23 ml of concentrated H2SO4 in 500 ml beaker and put the system in ice bath and stir. Add 0.5 g of NaNO3 and 3 g KMnO4 very slowly to avoid the agglomeration. After 1 h add 46 ml of di water and there after 30 min add 140 ml of warm water (40 oC) and add 10 ml of 30% concentrated H2O2. Filter the mixture and Centrifuge the mixture at 3400 rpm for 20 minutes in water 3-4 times.

Exfoliation of graphene layers by keeping GO at 1000 C for 30 secs. Results into formation of sheets of Graphene.(modified Hummers' method )

Synthesis of Iron Oxide nanoparticles

Iron obtained by two sources :- 1. Hydrothermal decomposition of iron II acetate

at 95C for 2-3 hours.Formation of iron oxide nanoparticles which are

attached to the surface of graphene oxide via metal carboxyl bonds.

Promotes nucleation of iron glycolate on the graphene oxide surface.

Iron oxide nanoribbons show a large aspect ratio and porous structure favouring, for example, the rapid diffusion of lithium ions from the electrolyte to electrode.

FeO-rGO compositeIron Oxide - rGO composite was prepared in three ways :-1. By stirring solution of iron nanoparticles and reduced graphene oxide and then vacuum drying.2. By in-situ reduction of mixture of rGO and fecl3 solution. 3. By stirring iron acetate and

rGO solution.

Figure 21 (a) Scheme showing the reaction steps for preparation of a graphene/iron oxide hybrid with iron oxide nanoparticles directly grown on the surface of graphene. (b-d) TEM images monitoring individual reaction steps. Reprinted

.Iron chloride solution in water. Then iron chloride is reduced by sodium borohydride. 0.001M and 0.2M fecl3 solution titrated by 20ml 0.1M sodium borohydride + 20ml 1M sodium hydroxide. Black coloured iron nanoparticles were obtained.

Raman Spectra

Fe2O3 : 223,283,1290FeOOH : 396,475,644,1068FeO : 597rGO: 1333,1584

The peaks observed in raman spectrum are :

SEM Image of rGO-FeO Composite(insitu) SEM Image of rGO

EDX of rGO- FeO composite was done the results were obtained as shown.

FTIR of rGO- FeO composite was done the results were obtained as shown.

THANK YOU