Abstract
The stability of 2D antimony telluride (Sb2Te3) nanoplates in ambient conditions is elucidated. These materials exhibit an anisotropic oxidation mode, and CVD synthesized samples oxidize at a much faster rate than exfoliated samples investigated in previous studies. Optical measurement techniques are introduced to rapidly measure the oxidation modes and thickness of 2D materials. Auger characterization were conducted to confirm that oxygen replaces tellurium as opposed to antimony under ambient conditions. No surface morphology evolution was detected in AFM before and after exposure to air. These techniques were employed to determine the origin of the thickness dependent color change effect in Sb2Te3. It is concluded that this effect is a combination of refractive index change due to oxidation and Fresnel effects.
Highlights
Two-dimensional (2D) binary sesquichalcogenides are viable material platforms for future flexible and low power nanodevices.[1,2,3,4] The unique properties of nanoscaled chalcogenide materials may enable future technologies such as integrated photonics and spintronics as well as providing a platform for fundamental research on the physics of low dimensional condensed matter systems.[5,6] Sb2Te3, Bi2Se3, and Bi2Te3 are topological insulators with a single Dirac cone in their interface with an insulator, vacuum, or superconductor.[7,8] These materials exhibit spin-momentum locking of the helical Dirac electrons.[9]
As the chemical purity of binary sesquichalcogenide nanostructures is so critical for technological application, a facile method for rapidly determining the chemical composition of these nanostructures is required, we previously did for graphene observation.[11]
The chamber conditions were set at 550◦ C, 7 minutes, and 100 standard cubic centimeters (SCCM) Ar flow
Summary
Two-dimensional (2D) binary sesquichalcogenides are viable material platforms for future flexible and low power nanodevices.[1,2,3,4] The unique properties of nanoscaled chalcogenide materials may enable future technologies such as integrated photonics and spintronics as well as providing a platform for fundamental research on the physics of low dimensional condensed matter systems.[5,6] Sb2Te3, Bi2Se3, and Bi2Te3 are topological insulators with a single Dirac cone in their interface with an insulator, vacuum, or superconductor.[7,8] These materials exhibit spin-momentum locking of the helical Dirac electrons.[9]. Rapid optical determination of topological insulator nanoplate thickness and oxidation Fan Yang,[1] Mariana Sendova,[2] Robin B.
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