Structural, compositional and textural properties of monoclinic α-Bi₂O₃ nanocrystals

R Yuvakkumar; Sun Ig Hong

doi:10.1016/j.saa.2015.02.093

Structural, compositional and textural properties of monoclinic α-Bi₂O₃ nanocrystals

Spectrochim Acta A Mol Biomol Spectrosc. 2015 Jun 5:144:281-6. doi: 10.1016/j.saa.2015.02.093. Epub 2015 Feb 26.

Authors

R Yuvakkumar¹, Sun Ig Hong²

Affiliations

¹ Department of Nanomaterials Engineering, Chungnam National University, Daejeon 305-764, South Korea. Electronic address: yuvakkumar@gmail.com.
² Department of Nanomaterials Engineering, Chungnam National University, Daejeon 305-764, South Korea. Electronic address: sihong@cnu.ac.kr.

PMID: 25770823
DOI: 10.1016/j.saa.2015.02.093

Abstract

Perfect α-Bi2O3 nanocrystals were successfully synthesized via green synthesis method. X-ray diffraction studies clearly revealed a single phase α-Bi2O3 nanocrystal without any secondary phase. The strong XPS peaks observed at 160 and 165 eV were assigned to Bi4f5/2 and Bi4f7/2 and clearly revealed Bi(3+) valence states of bismuth ions. Photoluminescence spectra revealed the perfect α-Bi2O3 crystal nature without having inter band transitions between defects, impurity and different valence states of bismuth ions. Out of thirty expected modes, the symmetry assignments of Raman bands correlated to Bg(4), Ag(5), Bg(5), Bg(6), Ag(7), Ag(8), Ag(9), Ag(10), Ag(12) and Ag(14) modes revealed perfect α-Bi2O3 nanocrystals. Transmission electron microscopy studies combined with a selected area electron diffraction pattern recorded on α-Bi2O3 nanocrystals show monoclinic structure preferential orientation with sizes approximately 200 nm in diameters and 500 nm in length.

Keywords: Monoclinic; Nanocrystals; Raman; α-Bi(2)O(3).

MeSH terms

Bismuth / chemistry*
Nanoparticles / chemistry*
Nanoparticles / ultrastructure
Photoelectron Spectroscopy
Spectrophotometry, Infrared
Spectrum Analysis, Raman
X-Ray Diffraction

Substances

bismuth oxide
Bismuth