Synthesis of Ternary and Quaternary Au and Pt Decorated CdSe/CdS Heteronanoplatelets with Controllable Morphology
Synthesis of Ternary and Quaternary Au and Pt Decorated CdSe/CdS Heteronanoplatelets with Controllable Morphology
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DOI：
10.1002/adfm.201604685
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发表时间：
2017-02-23
影响因子：
19
通讯作者：
Bigall, Nadja C.
中科院分区：
文献类型：
--
作者：
Naskar, Suraj;Luebkemann, Franziska;Bigall, Nadja C.
通过用Au和Pt结构域装饰五个单层厚的CdSe/CdS核/冠纳米片，获得了多种具有前所未有的结构形态的新型三元和四元金属-半导体无机纳米结构。通过改变CdSe核和CdS冠的尺寸，观察到金属生长行为的显着差异。取决于核尺寸，Au生长可以仅指向CdS边缘，或者同时指向纳米片的边缘和中心。相反，Pt畴的成核总是发生在CdS的边缘独立的核心和冠尺寸。此外，通过在Pt修饰的CdSe/CdS纳米片上额外的Au生长获得四元结构，其中现有Pt域的空间位阻效应导致Au成核仅发生在CdSe核心处。相反，两种贵金属生长顺序的改变导致Pt-Au合金仅存在于纳米片的周围边缘。此外，金属修饰的纳米片被发现是有效的催化剂，用于H-2燃料生成下白色光照射。测得的最高表观量子效率为19.3% +/-1.4%，转换频率约为每个纳米片每小时10（5）个H-2分子。
A variety of new ternary and quaternary metal-semiconductor inorganic nanostructures with unprecedented structural morphologies is achieved by the decoration of five monolayer-thick CdSe/CdS core/crown nanoplatelets with Au and Pt domains. Significant differences in metal growth behavior are observed by varying the CdSe core and the CdS crown dimensions. Depending on the core size, Au growth can be directed only to the CdS edges, or both at the edges and at the center of the nanoplatelets. In contrast, the nucleation of Pt domains always happens at the CdS edges independently of the core and crown dimensions. Furthermore, quaternary structures are obtained by additional Au growth on Pt-decorated CdSe/CdS nanoplatelets, where the effect of steric hindrance of the existing Pt domains results in the Au nucleation to occur only at the CdSe core. Instead, a change in the order of growth of the two noble metals results in Pt-Au alloys present only at the surrounding edges of the nanoplatelets. Additionally, the metal-decorated nanoplatelets are found to be efficient catalysts for H-2 fuel generation under white light irradiation. The highest apparent quantum efficiency measured is 19.3% +/- 1.4% with a turnover frequency of approximate to 10(5) molecules of H-2 per hour per nanoplatelet.