Termination-Property Coupling via Reversible Oxygen Functionalization of MXenes.
ACS Nanosci Au
; 2(5): 433-439, 2022 Oct 19.
Article
em En
| MEDLINE
| ID: mdl-36281254
ABSTRACT
MXenes are a growing family of 2D transition-metal carbides and nitrides, which display excellent performance in myriad of applications. Theoretical calculations suggest that manipulation of the MXene surface termination (such as =O or -F) could strongly alter their functional properties; however, experimental control of the MXene surface termination is still in the developmental stage. Here, we demonstrate that annealing MXenes in an Ar + O2 low-power plasma results in increased =O functionalization with minimal formation of secondary phases. We apply this method to two MXenes, Ti2CT x and Mo2TiC2T x (T x represents the mixed surface termination), and show that in both cases, the increased =O content increases the electrical resistance and decreases the surface transition-metal's electron count. For Mo2TiC2O x , we show that the O content can be reversibly altered through successive vacuum and plasma annealing. This work provides an effective way to tune MXene surface functionalization, which may unlock exciting surface-dependent properties.
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1
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
ACS Nanosci Au
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Estados Unidos