Bio-nano interaction of proteins adsorbed on single-walled carbon nanotubes

• We applied X-ray absorption near edge structure (XANES) spectroscopy to investigate the adsorption of proteins onto single-walled carbon nanotubes (SWCNTs). Specific XANES spectral features such as peptide C=O bonds in proteins were recognized and found to be affected by the corresponding aromatic structure of SWCNTs. Experimental data combined with first-principle calculation of the investigated nano-complex allow the understanding of adsorption mechanism and reveal that an interface interaction occurs leading to precise structural distortions of proteins. The study also demonstrates that XANES is a powerful tool to characterize structural details of proteins at the interface of complex systems.

Nyckelord

absorption fine-structure

inner-shell excitation

glycyl-glycine

spectroscopy

functionalization

immobilization

approximation

adsorption

energy

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