Abstract
Two-dimensional Bi2Se3 nanosheets with hexagonal shape are synthesized by a solution synthetic route. The Bi2Se3 nanosheets are 120 nm in edge width and 7 nm in thickness. The size of the Bi2Se3 nanosheets can be controlled by choosing different kinds of reducing agents including hydroxylamine and ethylenediamine. Subsequently, we demonstrate a configuration of two-color all-optical switching based on plasma channels effect using the as-synthesized Bi2Se3 nanosheets as an optical media. The signal light can be modulated as two states including dot and ring shape by changing the intensity of control light. The modulated signal light exhibits excellent spatial propagation properties. As a type of interesting optical material, ultrathin two-dimensional Bi2Se3 nanosheets might provide an effective option for photoelectric applications.
Highlights
Two-dimensional (2D) materials including grapheme [1], transition metal dichalcogenides [2], topological insulators [3] and black phosphorus [4,5] have large lateral size, but small vertical thickness
Two-color all-optical switching has successfully been realized based on twoIn summary, two-color all-optical switching has successfully been realized based on dimensional Bi2Se3 nanosheets as an optical media
Two-dimensional Bi2Se3 nanosheets with highly two-dimensional Bi2 Se3 nanosheets as an optical media
Summary
Two-dimensional (2D) materials including grapheme [1], transition metal dichalcogenides [2], topological insulators [3] and black phosphorus [4,5] have large lateral size, but small vertical thickness. As a 2D material, Bi2 Se3 possesses excellent thermoelectric properties and novel electronic band structure, which are heavily dependent on its morphology and size. Solution-based synthesis is an excellent alternative for the preparation of high quality ultrathin 2D Bi2 Se3 nanosheets [16,17,18] and has the advantages of simplicity, low reaction temperature, high yield and large amount [19,20,21,22,23]. The morphology and size of 2D Bi2 Se3 nanosheets can be effectively modulated by changing reaction conditions including surfactants, pH value, reaction temperature and time [12,14,19,24,25]. Searching for an effective reducing agent and establishing the relationship between the reducing agent and the size of nanoparticles are serious challenges
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