Atomically Thin Two-Dimensional Nanosheets with Tunable Spin-Crossover Properties
Atomically Thin Two-Dimensional Nanosheets with Tunable Spin-Crossover Properties
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具有可调自旋交叉特性的原子薄二维纳米片
DOI：
10.1021/acs.jpclett.8b03298
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发表时间：
2018
影响因子：
5.7
通讯作者：
Sun Bai Wang
中科院分区：
文献类型：
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作者：
Luo Yang Hui;Chen Chen;Lu Guo Wei;Hong Dan Li;He Xiao Tong;Wang Cong;Wang Jia Ying;Sun Bai Wang
将超薄二维 (2D) 纳米片的迷人优势与自旋交叉 (SCO) 材料的纳米结构相结合，代表了在器件水平上可控制造 SCO 纳米物体的一个有吸引力的目标。在这里，我们证明，通过简便操作的超声波力辅助液体剥离技术，三维（3D）范德华SCO块状前驱体{[Fe(1,3-bpp)2(NCS)2]2(1, 1,3-bpp = 1,3-di(4-pyridyl)-propane)}可以剥离成单层2D纳米片 （NS-1）。因此，磁性已从完全顺磁性（块状前驱体）调整到 250 K 左右的 SCO 转变（二维纳米片）。此外，金属-配体电荷跃迁（MLCT）、配体内π-π*跃迁和颜色显示在胶体悬浮液和固态中也发生了改变。不同形式和状态下物理化学性质的这些巨大变化可归因于卷曲或垂直堆叠的二维构建块内的层间范德华相互作用所产生的有效协同性。
Combining the fascinating advantages of ultrathin two-dimensional (2D) nanosheets with the nanostructuration of spin-crossover (SCO) materials represents an attractive target of controlled fabrication of SCO nano-objects at the device level. Here, we demonstrate that through facile-operating ultrasonic force-assisted liquid exfoliation technology the three-dimensional (3D) van der Waals SCO bulk precursor {[Fe(1,3-bpp)2(NCS)2]2(1, 1,3-bpp = 1,3-di(4-pyridyl)-propane)} can be exfoliated into single-layered 2D nanosheets (NS-1). As a consequence, the magnetism has been tuned from complete paramagnetic (bulk precursors) to SCO transition at around 250 K (2D nanosheets). In addition, the metal-to-ligand charge transition (MLCT), the intraligand π–π* transition and the color display also have been altered both in colloidal suspension and in the solid state. These dramatic changes of physical–chemical properties at different forms and states can be attributed to the efficient cooperativity derived from the interlayer van der Waals interactions within the curly or vertically stacked 2D building blocks.