Few-layer and large flake size borophene: preparation with solvothermal-assisted liquid phase exfoliation.
Few-layer and large flake size borophene: preparation with solvothermal-assisted liquid phase exfoliation.
复制标题
少层大片硼烯：溶剂热辅助液相剥离制备
作者：
二维硼（B）纳米片的制备，特别是硼氢化物的制备，由于其独特的结构和体相硼中复杂的B-B键，仍然是一个挑战。在目前的工作中，一种新的制备技术，只有几个层和大的片状尺寸的硼氢化物的溶剂热辅助液相剥离过程，包括球磨细化，溶剂热溶胀，和探头超声分层开发。本体B前驱体的剥离效果与所选溶剂如丙酮、N，N-二甲基甲酰胺（DMF）、乙腈、乙醇和N-甲基吡咯烷酮（NMP）的表面张力和Hildebrand参数有关，当使用溶剂时，相对小的表面张力有利于本体B的剥离。以丙酮为剥离溶剂，可以得到四层厚的硼化膜，平均横向尺寸为5.05 μm。剥离后的少层大尺寸硼化物的表面成分变化不大，但剥离前后B的化学状态发生了一定程度的变化，这是因为它们在表面被污染物部分氧化。该丙酮溶剂热辅助液相剥离技术可以制备出高质量的大尺寸硼化物，为进一步研究大尺寸少层硼化物提供了基础。采用液相剥离法可制备出4层结构、横向尺寸为5.05 μm的硼化物。
The preparation of two-dimensional boron (B) nanosheets, especially for borophene, is still a challenge because of its unique structure and complex B–B bonds in bulk boron. In the present work, a novel preparation technology for borophene with only a few layers and large flake sizes is developed by a solvothermal-assisted liquid phase exfoliation process, consisting of ball milling-thinning, solvothermal swelling, and probe ultrasonic delamination. The exfoliation effect of the bulk B precursors is related to the surface tension and Hildebrand parameter of the selected solvents such as acetone, N,N-dimethyl formamide (DMF), acetonitrile, ethanol, and N-methyl pyrrolidone (NMP), and a relative small surface tension when using solvents is favorable for the exfoliation of bulk B. Four-layer thick borophene and an average lateral size of 5.05 μm can be obtained in acetone as the exfoliating solvent. The surface composition of the exfoliated few-layer borophene with large flake size hardly changes, while the chemical state of B changes to some extent because they are partly oxidized on the surface by contaminates before and after exfoliation. This acetone solvothermal-assisted liquid phase exfoliation technique can be used to prepare high quality borophene with large horizontal sizes, and it will provide the basis to study few-layer borophene with large sizes further. Borophene with 4 layers and lateral size of 5.05 μm can be prepared by liquid phase exfoliation.
登录
查看更多内容
影响因子：
3.7
作者：
O'Neill, Arlene;Khan, Umar;Coleman, Jonathan N.
通讯作者：
Coleman, Jonathan N.
影响因子：
8.6
作者：
Prasad, Dasari L. V. K.;Jemmis, Eluvathingal D.
通讯作者：
Jemmis, Eluvathingal D.
用于气体传感的二维纳米结构材料
影响因子：
19
作者：
Liu, Xianghong;Ma, Tiantian;Zhang, Jun
通讯作者：
Zhang, Jun
影响因子：
3.9
作者：
Hernandez, Yenny;Lotya, Mustafa;Coleman, Jonathan N.
通讯作者：
Coleman, Jonathan N.
影响因子：
17.1
作者：
Akuzum, Bilen;Maleski, Kathleen;Gogotsi, Yury
通讯作者：
Gogotsi, Yury