Transformation of Pd Nanocubes into Octahedra with Controlled Sizes by Maneuvering the Rates of Etching and Regrowth,Journal of the American Chemical Society

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Transformation of Pd Nanocubes into Octahedra with Controlled Sizes by Maneuvering the Rates of Etching and Regrowth
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2013-08-05 , DOI: 10.1021/ja406344j
Maochang Liu _{1,

2} , Yiqun Zheng ₃ , Lei Zhang ₁ , Liejin Guo ₂ , Younan Xia _{1,

3}

Affiliation

Palladium octahedra with controlled edge lengths were obtained from Pd cubes of a single size. The success of this synthesis relies on a transformation involving oxidative etching and regrowth. Because the {100} side faces of the Pd nanocubes were capped by Br(-) ions, Pd atoms were removed from the corners during oxidative etching, and the resultant Pd(2+) ions could be reduced and deposited back onto the nanocubes, but preferentially on the {100} facets. We could control the ratio of the etching and regrowth rates (R(etching) and R(regrowth)) simply by varying the amount of HCl added to the reaction solution. With a large amount of HCl, etching dominated the process (R(etching) ≫ R(regrowth)), resulting in the formation of Pd octahedra with an edge length equal to 70% of that of the cubes. In contrast, with a small amount of HCl, all of the newly formed Pd(2+) ions could be quickly reduced and deposited back onto the Pd cubes. In this case, R(etching) ≈ R(regrowth), and the resultant Pd octahedra had roughly the same volume as the starting cubes, together with an edge length equal to 130% of that of the cubes. When the amount of HCl was between these two extremes, we obtained Pd octahedra with intermediate edge lengths. This work not only advances our understanding of oxidative etching in nanocrystal synthesis but also offers a powerful means for controlling the shape and size of metal nanocrystals simply by adjusting the rates of etching and regrowth.

中文翻译：

通过控制蚀刻和再生速率将 Pd 纳米立方体转化为具有可控尺寸的八面体

从单一尺寸的 Pd 立方体获得具有受控边缘长度的钯八面体。这种合成的成功依赖于涉及氧化蚀刻和再生的转化。由于 Pd 纳米立方体的 {100} 侧面被 Br(-) 离子覆盖，在氧化蚀刻过程中 Pd 原子从角落被去除，并且所得的 Pd(2+) 离子可以被还原并沉积回纳米立方体上，但优先在 {100} 方面。我们可以简单地通过改变添加到反应溶液中的 HCl 的量来控制蚀刻和再生长速率的比率（R（蚀刻）和 R（再生长））。在大量 HCl 的情况下，蚀刻占主导地位（R（蚀刻）≫ R（再生）），导致形成 Pd 八面体，其边长等于立方体的 70%。相比之下，当加入少量 HCl 时，所有新形成的 Pd(2+) 离子都可以快速还原并沉积回 Pd 立方体上。在这种情况下，R(蚀刻)≈R(再生)，所得Pd八面体的体积与起始立方体大致相同，边长等于立方体的130%。当 HCl 的量介于这两个极端之间时，我们获得了具有中间边缘长度的 Pd 八面体。这项工作不仅增进了我们对纳米晶体合成中氧化蚀刻的理解，而且还提供了一种通过调节蚀刻和再生长速率来控制金属纳米晶体形状和尺寸的有力手段。边长等于立方体的 130%。当 HCl 的量介于这两个极端之间时，我们获得了具有中间边缘长度的 Pd 八面体。这项工作不仅增进了我们对纳米晶体合成中氧化蚀刻的理解，而且还提供了一种通过调节蚀刻和再生长速率来控制金属纳米晶体形状和尺寸的有力手段。边长等于立方体的 130%。当 HCl 的量介于这两个极端之间时，我们获得了具有中间边缘长度的 Pd 八面体。这项工作不仅增进了我们对纳米晶体合成中氧化蚀刻的理解，而且还提供了一种通过调节蚀刻和再生长速率来控制金属纳米晶体形状和尺寸的有力手段。

更新日期：2013-08-05

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