Hydrothermal synthesis and formation mechanism of the single-crystalline Bi4Ti3O12 nanosheets with dominant (010) facets. Issue 13 (7th March 2016)

• Record Type: Journal Article
• Authors: Xu, Gang; Yang, Yongrong; Bai, Huiwen; Wang, Jiangwei; Tian, He; Zhao, Ruoyu; Wei, Xiao; Yang, Xin; Han, Gaorong
• Is Part Of: CrystEngComm. Volume 18:Issue 13(2016)
• Page Start: 2268
• Page End: 2274
• Publication Date: 2016-03-07
• Subjects: Crystals -- Periodicals; Crystal growth -- Periodicals; Crystallography -- Periodicals; Cristaux -- Périodiques; Cristaux -- Croissance -- Périodiques; Cristallographie -- Périodiques; 548
• DOI: 10.1039/c6ce00067c
• Languages: English
• ISSNs: 1466-8033

Abstract

Abstract : In virtue of the exfoliation of the TiO6 octahedrons from the layered K2 Ti6 O13 lattice and the preferential adsorption of PVA on (010) planes, the Bi4 Ti3 O12 crystallize to (010) nanosheets with large area. Abstract : Single-crystalline bismuth-layered perovskite Bi4 Ti3 O12 nanosheets with a thickness of about 20 nm and a lateral size over several micrometers have been synthesized by a PVA assisted hydrothermal route. The as-prepared Bi4 Ti3 O12 nanosheets were characterized by means of X-ray diffraction, field-emission scanning electron microscopy, transmission electron microscopy (TEM) and high-resolution TEM. The as-prepared Bi4 Ti3 O12 nanosheets have (010) dominated surface facets. Time-dependent experiments reveal that the layered K2 Ti6 O13 nanofibers formed in the initial stage of the hydrothermal treatment play a key role in the synthesis of Bi4 Ti3 O12 . In the proceeding hydrothermal treatment, the Bi 3+ ions substitute for the K + ions in the layered K2 Ti6 O13 and peel off the TiO6 octahedron lamellae from the lattice of K2 Ti6 O13, which then serves as a template for the formation of lamellar Bi4 Ti3 O12 by reaction with the dehydrated Bi 3+ ions. Finally, the lamellar Bi4 Ti3 O12 species crystallize and grow to single-crystalline Bi4 Ti3 O12 nanosheets under the effect of the preferential adsorption of PVA on the (010) planes. In addition, the band gap and the optoelectronic properties of the single-crystalline Bi4 Ti3 O12 nanosheets were investigated by measuring their UV-vis absorption and photoluminescence spectra, respectively.