MXenes公司
表面改性
退火(玻璃)
材料科学
氮化物
等离子体
过渡金属
碳化物
金属
纳米技术
化学物理
化学
图层(电子)
复合材料
物理化学
物理
冶金
催化作用
量子力学
生物化学
作者
James L. Hart,Kanit Hantanasirisakul,Yury Gogotsi,Mitra L. Taheri
出处
期刊:ACS Nanoscience Au
[American Chemical Society]
日期:2022-06-28
卷期号:2 (5): 433-439
被引量:4
标识
DOI:10.1021/acsnanoscienceau.2c00024
摘要
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, Ti2CTx and Mo2TiC2Tx (Tx 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 Mo2TiC2Ox, 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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