Journal
ACS NANO
Volume 15, Issue 1, Pages 447-454Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c03987
Keywords
biofilms; defects; graphene; microbial corrosion; density-functional theory; sulfate-reducing bacteria
Categories
Funding
- National Science Foundation CAREER award [1454102]
- NSF RII T-1 FEC [1849206]
- NSF RII T-2 FEC [1920954]
- NASA [NNX16AQ98A]
- Air Force Office of Scientific Research [FA9550-18-10072]
- Department of Energy, Fossil Energy Program, UT-Battelle [DE-AC05-00OR22725, 4000174979]
- R. Welch Foundation [C-1590]
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Graphene shows promise in biointerface applications, effectively restricting biogenic sulfide attack. Single-layered graphene may worsen the attack, while multilayered graphene offers better protection. Defects, such as double vacancy defects and grain boundaries, affect the protection ability of graphene layers.
Graphene is a promising material for many biointerface applications in engineering, medical, and life-science domains. Here, we explore the protection ability of graphene atomic layers to metals exposed to aggressive sulfate-reducing bacteria implicated in corrosion. Although the graphene layers on copper (Cu) surfaces did not prevent the bacterial attachment and biofilm growth, they effectively restricted the biogenic sulfide attack. Interestingly, single-layered graphene (SLG) worsened the biogenic sulfide attack by 5-fold compared to bare Cu. In contrast, multilayered graphene (MLG) on Cu restricted the attack by 10-fold and 1.4-fold compared to SLG-Cu and bare Cu, respectively. We combined experimental and computational studies to discern the anomalous behavior of SLG-Cu compared to MLG-Cu. We also report that MLG on Ni offers superior protection ability compared to SLG. Finally, we demonstrate the effect of defects, including double vacancy defects and grain boundaries on the protection ability of atomic graphene layers.
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