Synthesis of acicular α-Bi2O3 microcrystals by microwave-assisted hydrothermal method. (17th November 2019)

• Record Type: Journal Article
• Authors: Schmidt, Samara; Kubaski, Evaldo T.; Volanti, Diogo P.; Sequinel, Thiago; Bezzon, Vinicius D. N.; Tebcherani, Sergio M.
• Is Part Of: Particulate science and technology. Volume 37:Number 8(2019)
• Page Start: 927
• Page End: 931
• Publication Date: 2019-11-17
• Subjects: Bismuth(III) oxide microcrystal -- crystal growth -- hydrothermal method -- microwave processing -- powders: chemical preparation; Particles -- Periodicals; 620.43
• DOI: 10.1080/02726351.2018.1457108
• Languages: English
• ISSNs: 0272-6351

Abstract

ABSTRACT: Materials based on bismuth(III) oxide are candidate to be used in optical and electronic devices because of their properties such as a variable band gap, photoconductivity, photoluminescence, high refractive index, and dielectric permittivity. These properties are dependent of several factors, e.g., present phases and crystal morphology. The microwave-assisted hydrothermal method (MAH) is a fast and efficient approach of synthesis to obtain semiconductor powders. However, the synthesis of monoclinic bismuth oxide (α-Bi2 O3 ) with acicular morphology by MAH was not found in literature. In this paper, microcrystals of acicular α-Bi2 O3 (monophasic) were successfully obtained by MAH using a synthesis temperature of 80°C for 0.5 h. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron, and transmission electron microscopies showed the formation of a monoclinic structure (space group P21/c) with acicular morphology that grew along the [001] direction. The temperature and time necessary to synthetize acicular microcrystals were significantly lower than those found for acicular microcrystals obtained by conventional hydrothermal method.