Bioinspired Synthesis of Quasi-Two-Dimensional Monocrystalline Oxides
Bioinspired Synthesis of Quasi-Two-Dimensional Monocrystalline Oxides
复制标题
DOI：
10.1021/acs.chemmater.9b03307
复制
发表时间：
2019-11-12
影响因子：
8.6
通讯作者：
Wang, Xudong
中科院分区：
文献类型：
--
作者：
Wang, Yizhan;Shi, Yeqi;Wang, Xudong
二维单晶氧化物纳米材料的可控合成是一个有趣但极具挑战性的课题。受生物矿化过程的启发，通常实施具有正电荷和负电荷的有机模板来调节晶体成核和生长，我们将混合电荷两亲性单层调整为离子层外延，并实现单晶2D纳米片的生长。原位掠入射X射线衍射和非原位晶体和元素分析表明，在模板中的混合电荷能够调整二维晶体成核速率，促进单晶畴的生长。分子动力学模拟表明，混合电荷可以得到稳定、平整、有序的单层模板，且电荷分布不均匀，有利于单晶纳米片的生长。设计混合的两亲性单层导致从各种氧化物（包括CoO、Bi2O3、MnO 2和Fe3O4）以及掺杂的氧化物中产生纳米片，从而打开了将2D纳米材料家族拓宽到功能氧化物的机会。
Controllable synthesis of two-dimensional (2D) monocrystalline oxide nanomaterials beyond van der Waals solids is intriguing but very challenging. Inspired by the biomineralization processes that commonly implement organic templates with both positive and negative charges for regulating the crystal nucleation and growth, we adapted mix-charges amphiphilic monolayer to the ionic layer epitaxy and enabled the growth of monocrystalline 2D nanosheets. In situ grazing incidence X-ray diffraction and ex situ crystal and elemental analyses revealed that mixing charge in the template is able to tune the 2D crystal nucleation rate and promote the growth of monocrystalline domains. Molecular dynamics simulations suggested that mixing charges could yield a stable, flatter, and more ordered monolayer template with a nonuniform distribution of charges, which are favorable for the growth of monocrystalline nanosheets. Designing the mixed amphiphilic monolayers resulted in the creation of ultrathin nanosheets from various oxides including CoO, Bi2O3, MnO2, and Fe3O4 as well as doped ones, opening up an opportunity to broaden the 2D nanomaterial family to functional oxides.