Inorganic Chemistry, Vol.41, No.3, 455-461, 2002
Growth of Sb2E3 (E = S, Se) polygonal tubular crystals via a novel solvent-relief-self-seeding process
A novel solvent-relief-self-seeding (SRSS) process was applied to grow bulk polygonal tubular single crystals of Sb2E3 (E = S, Se), using SbCl3 and chalcogen elements E (E = S, Se) as the raw materials at 180 degreesC for 7 days in ethanol solution. The products were characterized by various techniques, including X-ray powder diffraction (XRD), scanning electronic microscope (SEM), transmission electronic microscope (TEM), electronic diffraction (ED), and X-ray photoelectron spectra (XPS). The calculated electrical resistivities of the tubular single crystals in the range 20-320 K were of the order of 10(5)-10(6) Ohm cm for Sb2S3 and 10(3)-10(4) Ohm cm for Sb2Se3, respectively. The studies of the optical properties revealed that the materials formed had a band gap of 1.72 eV for Sb2S3 and 1.82 eV for Sb2Se3, respectively. The optimal reaction conditions for the growth of bulk tubular single crystals were that the temperature was not lower than 180 degreesC and the reaction time was not shorter than 7 days. The possible growth mechanism of tubular crystals was also discussed.