Journal
MOLECULES
Volume 24, Issue 24, Pages -Publisher
MDPI
DOI: 10.3390/molecules24244488
Keywords
Si nanostructures; staphylococcus aureus bacterial biofilm; bactericidal effect; surface-enhanced IR microscopy; chemical enhancement
Funding
- Russian Science Foundation [18-15-00220]
- Ministry of science and higher education [074-U01]
- Russian Science Foundation [18-15-00220] Funding Source: Russian Science Foundation
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Surface-enhanced IR absorption (SEIRA) microscopy was used to reveal main chemical and physical interactions between Staphylococcus aureus bacteria and different laser-nanostructured bactericidal Si surfaces via simultaneous chemical enhancement of the corresponding IR-absorption in the intact functional chemical groups. A cleaner, less passivated surface of Si nanoripples, laser-patterned in water, exhibits much stronger enhancement of SEIRA signals compared to the bare Si wafer, the surface coating of oxidized Si nanoparticles and oxidized/carbonized Si (nano) ripples, laser-patterned in air and water. Additional very strong bands emerge in the SEIRA spectra on the clean Si nanoripples, indicating the potential chemical modifications in the bacterial membrane and nucleic acids during the bactericidal effect.
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