Structural, electronic structure and antibacterial properties of grapheneoxide nano-sheets
- Structural, electronic structure and antibacterial properties of grapheneoxide nano-sheets
- 채근화; 원성옥; 아디티아 샤르마; MAYORA VARSHNEY; Sitansu Sekhar Nanda; Hyun Joon Shin; Namdong Kim
- Graphene oxide; Raman; XAS; Antibacterial; STXM
- Issue Date
- Chemical physics letters
- VOL 698-92
- Correlation between the structural/electronic structure properties and bio-activity of graphene-based materials need to be thoroughly evaluated before their commercial implementation in the health and environment precincts. To better investigate the local hybridization of sp2/sp3 orbitals of the functional groups of graphene-oxide (GO) and their execution in the antimicrobial mechanism, we exemplify the antibacterial activity of GO sheets towards the Escherichia coli bacteria (E. coli) by applying the field-emission scanning electron microscopy (FESEM), near edge X-ray absorption fine structure (NEXAFS) and scanning transmission X-ray microscope (STXM) techniques. C K-edge and O K-edge NEXAFS spectra have revealed lesser sp2 carbon atoms in the aromatic ring and attachment of functional oxygen groups at GO sheets. Entrapment of E. coli bacteria by GO sheets is evidenced by FESEM investigations and has also been corroborated by nano-scale imaging of bacteria using the STXM. Spectroscopy evidence of functional oxygen moieties with GO sheets and physiochemical entrapment of E. coli bacteria have assisted us to elaborate the mechanism of cellular oxidative stress-induced disruption of bacterial membrane.
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