表面改性
胱氨酸
硫醇
半胱氨酸
惰性
共价键
产量(工程)
二硫键
化学
过渡金属
纳米技术
二硫化钼
材料科学
组合化学
有机化学
催化作用
物理化学
酶
冶金
生物化学
作者
Xin Chen,Nina C. Berner,Claudia Backes,Georg S. Duesberg,Aidan R. McDonald
标识
DOI:10.1002/anie.201510219
摘要
Two-dimensional layered transition metal dichalcogenides (TMDs) have attracted great interest owing to their unique properties and a wide array of potential applications. However, due to their inert nature, pristine TMDs are very challenging to functionalize. We demonstrate a general route to functionalize exfoliated 2H-MoS2 with cysteine. Critically, MoS2 was found to be facilitating the oxidation of the thiol cysteine to the disulfide cystine during functionalization. The resulting cystine was physisorbed on MoS2 rather than coordinated as a thiol (cysteine) filling S-vacancies in the 2H-MoS2 surface, as originally conceived. These observations were found to be true for other organic thiols and indeed other TMDs. Our findings suggest that functionalization of two-dimensional MoS2 using organic thiols may not yield covalently or datively tethered functionalities, rather, in this instance, they yield physisorbed disulfides that are easily removed.
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