State Key Laboratory for Physical Chemistry of Solid Surfaces and Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China.
J Am Chem Soc. 2011 Oct 12;133(40):15946-9. doi: 10.1021/ja207788h. Epub 2011 Sep 20.
An etching growth strategy was developed to prepare corolla-like Pd mesocrystals consisting of unidirectionally aligned, well-spaced, and connected ultrathin (1.8-nm-thick) Pd nanosheets. The combined use of CO and Fe(3+) is critical to the successful synthesis of the branched corolla-like Pd mesocrystals. While CO functions as the surface-confining agent to allow anisotropic growth of the 1.8-nm-thick Pd nanosheets as branches, Fe(3+) etches the Pd seeds at the early stage of the reaction to induce formation of the branched structure. Inheriting the unique properties of 1.8-nm-thick Pd nanosheets, the as-prepared Pd mesocrystals display well-defined surface plasmon resonance absorption in the near-infrared region, a high electrochemically active surface area, and a significant photothermal effect when irradiated with a near-infrared laser. Owing to the presence of internal voids and increased apparent thickness, the Pd mesocrystals also exhibit several features superior to those of single-domain Pd nanosheets, making them promising for electrocatalysis and cancer photothermal therapy applications.
采用刻蚀生长策略制备了具有花瓣状形貌的 Pd 多晶，由定向排列、间距均匀且相互连接的超薄（1.8nm 厚）Pd 纳米片组成。CO 和 Fe(3+) 的共同使用对于成功合成支化的花瓣状 Pd 多晶至关重要。CO 作为表面限制剂，允许 1.8nm 厚的 Pd 纳米片作为支化方向进行各向异性生长，而 Fe(3+) 在反应的早期刻蚀 Pd 晶种，以诱导支化结构的形成。所制备的 Pd 多晶继承了 1.8nm 厚 Pd 纳米片的独特性质，在近红外区域显示出明确的表面等离子体共振吸收、高电化学活性表面积和显著的光热效应，当用近红外激光照射时。由于存在内部空隙和增加的表观厚度，Pd 多晶还表现出优于单畴 Pd 纳米片的几个特征，使其在电催化和癌症光热治疗应用中具有广阔的前景。
