Pseudomorphic Replacement in the Transformation between Metal–Organic Frameworks toward Three-Dimensional Hierarchical Nanostructures,Chemistry of Materials

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Pseudomorphic Replacement in the Transformation between Metal–Organic Frameworks toward Three-Dimensional Hierarchical Nanostructures
Chemistry of Materials ( IF 7.2 ) Pub Date : 2022-06-10 , DOI: 10.1021/acs.chemmater.2c00021
Lei Shao ₁ , Fuqiang Fan ₁ , Xueya Dai _{2,

3} , Hongxin Fu ₄ , Wenze Li ₄ , Wei Qi _{2,

3} , Fan-Bao Meng ₁ , Yu Fu ₁

Affiliation

The construction of three-dimensional hierarchical materials from nano building blocks has received tremendous attention because of the intriguing architecture and promising application potential of these materials. However, the use of traditional assembly methods to construct hierarchical nanostructures with complicated 3D shapes across multiple length scales remains challenging. Herein, we developed a new strategy to fabricate hierarchical nanostructures by borrowing the concept of pseudomorphic replacement from mineralogy; this concept refers to a specific conversion between minerals with the preservation of the pristine shape through an interface-coupled dissolution–precipitation mechanism. By employing pseudomorphic replacement to the transformation between metal–organic frameworks (MOFs), a series of hierarchical MOF materials with similar nanostructures but various shapes and dimensions were successfully fabricated. The experiments verified that these transformations not only preserve the shape of the pristine MOF crystals but also proceed via an interface-coupled dissolution–recrystallization process. To our knowledge, our investigation is the first explicit demonstration of pseudomorphic replacement in the transformation between MOFs, offering a new route to hierarchical materials with enhanced control ability and extended control scope.

中文翻译：

金属-有机框架向三维分层纳米结构转变中的假晶置换

由于这些材料的引人入胜的结构和广阔的应用潜力，由纳米构件构建三维分层材料受到了极大的关注。然而，使用传统的组装方法来构建具有跨多个长度尺度的复杂 3D 形状的分层纳米结构仍然具有挑战性。在此，我们通过借鉴矿物学中假晶替代的概念，开发了一种制造分层纳米结构的新策略；这个概念是指矿物之间的特定转换，通过界面耦合的溶解-沉淀机制保持原始形状。通过对金属-有机框架 (MOF) 之间的转换采用假晶置换，成功制造了一系列具有相似纳米结构但形状和尺寸不同的分层MOF材料。实验证实，这些转变不仅保留了原始 MOF 晶体的形状，而且还通过界面耦合的溶解-重结晶过程进行。据我们所知，我们的研究首次明确证明了 MOF 之间转换中的假晶替换，为具有增强控制能力和扩展控制范围的分层材料提供了一条新途径。

更新日期：2022-06-10

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