Synthesis and dielectric relaxation behavior of metallic Bi2Te3 nanotubes

Multiwalled Bi2Te3 nanotubes were synthesized via a trouble-free solvothermal route at 100 °C. X-ray diffraction pattern confirms the rhombohedral phase of as synthesized Bi2Te3 sample. The electrical conductivity (σ) and dielectric properties of as synthesized Bi2Te3 nanotubes were investigated. The metallic behavior (dσ/dT<0) of Bi2Te3 nanotubes was observed and Debye theory was applied to demonstrate the dielectric relaxation behavior of Bi2Te3 nanotubes. Bi2Te3 nanotubes with high dielectric constant (ε′∼30-3178) and low dielectric loss (tan δ∼0.04-4.04) confirms that capacitors of capacity (C∼41-2296 pF) may be fabricated which will be useful for storage of renewable energy in various practical devices.