Scalable synthesis of two-dimensional antimony telluride nanoplates down to a single quintuple layer

Abstract

Scalable syntheses of two-dimensional topological insulators are critical to material exploration. We demonstrate a controlled assembly of a two-dimensional V-VI group compound, Sb 2 Te 3 nanoplates (NPs), through a vapor-solid growth process. The physical thickness of Sb 2 Te 3 NPs can be rationally controlled in a wide range, from hundreds of nm down to sub-10 nm. Single-quintuple-layer Sb 2 Te 3 NPs were obtained, with a high domain density of $2.465  10 8 cm À2 over a large surface area (1 cm  1 cm) of a SiO 2 /Si substrate, verifying a scalable synthesis method. Extensive material analyses were conducted to explore the basic properties of Sb 2 Te 3 NPs using SEM and AFM, etc. HRTEM analysis confirms that the NP samples exhibit a highly crystalline structure and XPS analysis confirms the chemical composition and material stoichiometry. The growth of 2D topological insulator nanostructures may open up new opportunities in surface-state studies and potential applications in low-dissipative electronic systems.

Novel synthesis of topological insulator based nanostructures (Bi2Te3) demonstrating high performance photodetection

“…S2). Such nucleation center was also observed previously during the deposition of Sb 2 Te 3 quintuples by vapor solid method 25 . The energy dispersive X ray (EDS) analysis is shown in the insets of the Fig.…”

Rapid optical determination of topological insulator nanoplate thickness and oxidation

“…It has been suggested in literature that this color change is due to quantumconfinement. 13 It can be observed that the color change of the material is dramatic as thickness is minimized in Fig. 1c.…”

“…Furthermore, Auger electron spectroscopy is utilized to verify that the changes in optical properties arise from oxidation. This investigation clarifies the origin of thickness-and chemistry-dependent 13 A 100 nm SiO 2 /Si target substrate was placed 5 cm from edge of the furnace, and source powder was placed in the furnace center. The chamber was first evacuated starting by evacuated to 15 mTorr vacuum for 30 minutes.…”

Biomedical applications of 2D monoelemental materials formed by group VA and VIA: a concise review

“…In recent years, many new 2D nanomaterials have been prepared by CVD technology. The controllable growth of Sb 2 Te 3 nanosheets occurs on the surface of SiO 2 [ 81 ]. Bismuth oxide monocrystalline films could be prepared on amorphous substrates by aerogel-assisted CVD [ 82 ].…”