Colloidal Synthesis of Single-Layer MSe2 (M = Mo, W) Nanosheets via Anisotropic Solution-Phase Growth Approach
Colloidal Synthesis of Single-Layer MSe2 (M = Mo, W) Nanosheets via Anisotropic Solution-Phase Growth Approach
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DOI：
10.1021/jacs.5b02772
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发表时间：
2015-06-17
影响因子：
15
通讯作者：
Cheon, Jinwoo
中科院分区：
文献类型：
--
作者：
Jung, Wonil;Lee, Sujeong;Cheon, Jinwoo
单层2维（2D）纳米片的产生一直是具有挑战性的，特别是在溶液相中，因为它需要高度各向异性的生长过程，该生长过程在纳米片形成期间专门促进平面方向性。在这项研究中，我们发现，这种选择性的生长途径可以通过调节配位帽配体的结合亲和力的2D层状过渡金属硫族化物（TMC）的边缘小平面来实现。在将封端配体的官能团从羧基加到醇和胺并相应地调节对边缘的结合亲和力时，控制纳米片的层数。单层MSe2（M = Mo，W）TMC纳米片的使用油酸，而多层纳米片形成相对较强的结合配体，如油醇和油胺。通过在二维各向异性生长机制中选择合适的封端配体，我们的基于溶液的合成方法可以为获得单层TMC纳米片提供新的指导。
The generation of single-layer 2-dimensional (2D) nanosheets has been challenging, especially in solution-phase,, since it requires highly anisotropic growth processes that exclusively promote planar directionality during nanocrystal formation. In this study, we discovered that such selective growth pathways can be achieved by modulating the binding affinities of coordinating Capping ligands to the edge facets of 2D layered transition-metal chalcogenides (TMCs). Upon changing the functional groups Of the capping ligands from carboxylic add to alcohol and amine with accordingly modulated binding affinities to the edges, the number of layers of nanosheets is controlled. Single-layer MSe2 (M = Mo, W) TMC nanosheets are obtained with the use of oleic acid; while multilayer nanosheets are formed with relatively strong binding ligands such as oleyl alcohol and oleylamine. With the choice of appropriate capping ligands in the 2D anisotropic growth regime, our solution-based synthetic method can serve a new guideline for obtaining single-layer TMC nanosheets.