点击次数：

发表刊物：The Journal of Physical Chemistry C

收录刊物：SCI

卷号：125

期号：46

页面范围：25739–25748

DOI码：10.1021/acs.jpcc.1c08239

发表时间：2021-11-11

影响因子：3.7

摘要：Two-dimensional layered MoS2 has attracted tremendous attention because of its unique physical and chemical properties and promising application prospects. To further expand its applications to areas such as gas sensing, biosensing, drug delivery, and photothermal therapy, surface functionalization has been employed to engineer its properties according to multiple perspectives. Herein, we demonstrate a scalable surface modification method to generate functionalized MoS2 flakes by the step-by-step covalent assembly of lipoic acid (LA) and fluorescein isothiocyanate (FITC) molecules. In our approach, reactive disulfide-containing LA molecules were first chemically bonded to the sulfur vacancies (SVs) of MoS2 surfaces. FITC was then linked to MoS2 through LA by a condensation reaction between the amino group of FITC and the carboxyl group of LA. It was demonstrated that the initial LA functionalization enhanced the electronic mobility via the filling of SVs, and the second-step functionalization with FITC induced electron doping of MoS2. Moreover, the covalent attachment of FITC decorated the PL spectrum of MoS2 with an additional green fluorescence at ∼530 nm. This strategy is a universal route to construct a versatile platform for chemical modification of functional groups and provides new opportunities of controlling the electronic and optical properties of transition-metal dichalcogenides.

发布期刊链接：https://doi.org/10.1021/acs.jpcc.1c08239