Zhu Chenqi, Chen Dongdong, Cao Weicheng, Lai Runchen, Pu Chaodan, Li Jiongzhao, Kong Xueqian, Peng Xiaogang
Center for Chemistry of High-Performance & Novel Materials, Department of Chemistry, Zhejiang University, Hangzhou, 310027, China.
Angew Chem Int Ed Engl. 2019 Dec 2;58(49):17764-17770. doi: 10.1002/anie.201909576. Epub 2019 Oct 22.
Facet-dependent on-surface reactions are systematically studied on zinc-blende CdSe nanoplatelets with atomically-flat {001} basal facets and small yet non-polar side facets. The on-surface half-reactions between the surface Se sites and Cd carboxylates in the solution are qualitatively equivalent to those on the spheroidal counterparts. Conversely, the on-surface half-reactions between the surface Cd sites and the activated Se precursors in solution show a strong facet-dependence, which includes three distinguishable stages. In the first stage, the Se precursors adsorb onto the small and non-polar side facets of the nanoplatelets. The second stage is initiated by the adsorbed Se precursors at the side-basal plane edges and proceeds from the edges to the center of the basal planes in quasi-zeroth-order kinetics. In the third stage, the nanoplatelets are dismantled, which includes the creation of a hole in the middle and a build-up of thick edges.
在具有原子级平整的{001}基面和平坦但非极性侧面的闪锌矿型CdSe纳米片上，系统地研究了面依赖的表面反应。溶液中表面硒位点与羧酸镉之间的表面半反应在性质上与球形对应物上的半反应相当。相反，溶液中表面镉位点与活化的硒前驱体之间的表面半反应表现出强烈的面依赖性，包括三个可区分的阶段。在第一阶段，硒前驱体吸附在纳米片的小的非极性侧面上。第二阶段由吸附在侧面-基面边缘的硒前驱体引发，并以准零级动力学从边缘向基面中心进行。在第三阶段，纳米片被拆解，包括在中间形成一个孔和厚边缘的堆积。
