On August 6, the research group of Professor Cao Huaqiang from the Department of Chemistry of Tsinghua University and his collaborators published an online publication in Nature Communications entitled “Preparing bulk black phosphorus into zigzag orientation black by'unzipping' Research paper on "Unzipping of black phosphorus to form zigzag-phosphorene nanobelts". The research team used electrochemical means to control the concentration of oxygen molecules to prepare nanoribbons along zigzag orientation; at the same time, by adjusting the current density, the controllable preparation of black phosphorene nanosheets, nanoribbons and quantum dots can be achieved; through theory The calculation revealed the mechanism of the directional cutting of black phosphorene by oxygen molecules; the black phosphorene nanoribbons prepared were used to construct field-effect transistor devices and their carrier transport characteristics were deeply studied.
Black phosphorene two-dimensional nanostructure, including monoatomic layer black phosphorene and few layer black phosphorene (<10 layers). Unlike graphene, black phosphorene itself has a band gap and unique anisotropy. Theoretical calculations predict that black phosphorene has better thermal, mechanical and semiconductor properties in the zigzag direction than in the armchair direction. Therefore, zigzag-oriented black phosphorene nanoribbons are used in the fields of thermoelectricity, flexible electronics and quantum information technology. Aroused widespread interest of researchers. However, limited by the stability of black phosphorene and the existing synthesis technology, the effective preparation of black phosphorene nanobelts has become a key bottleneck in its research and application.
Inspired by the fact that black phosphorus can be oxidized and decomposed in the air environment, the team designed an electrochemical method to effectively adjust the ion intercalation rate and the concentration of oxygen molecules around the black phosphorus by changing the current density, thereby controlling the preparation of black phosphorus Based on the dimensions and dimensions of the ene nanostructures, a series of black phosphorene nanostructures were obtained, including nanosheets, nanobelts and quantum dots. Structural characterization proves that the prepared black phosphorene nanobelt has good crystallinity and flexibility.