Effect of pH, Surfactant, and Temperature on Mixed-Phase Structure and Band Gap Properties of BiNbO4 Nanoparticles Prepared Using Different Routes

Bakiro, Maram and Hussein Ahmed, Salwa and Alzamly, Ahmed (2019) Effect of pH, Surfactant, and Temperature on Mixed-Phase Structure and Band Gap Properties of BiNbO4 Nanoparticles Prepared Using Different Routes. Chemistry, 1 (1). pp. 89-110. ISSN 2624-8549

[thumbnail of chemistry-01-00008.pdf] Text
chemistry-01-00008.pdf - Published Version

Download (6MB)

Abstract

α- and β-BiNbO4 nanoparticles were successfully prepared using three different routes, namely co-precipitation, hydrothermal, and citrate precursor methods. Structural characterization has been analyzed using powder X-ray diffraction where results confirmed the mixed-phase nature of the prepared powders. When co-precipitation method is applied, BiNbO4 prepared at pH 2 and calcined at 750 °C shows predominately the α-BiNbO4 owning the narrowest band gap of 2.86 eV, whereas an increase in the pH value resulted in the β-BiNbO4 phase being the predominant phase. On the other hand, samples prepared using citrate precursor method show co-existence of both α- and β-BiNbO4 at all pH values under study; however, at pH 10 the β-BiNbO4 was the dominant phase exhibiting a higher bandgap energy value of 3.16 eV. When applying the hydrothermal approach, BiNbO4 prepared at all pH ranges of the present study show a band gap >3.2 eV indicating their activity in the ultraviolet region of the spectrum. Moreover, increasing calcination temperature to 900 °C, a gradual transformation of α- to β was observed. Lastly, it was noticed that as the lattice volume increases, the band gap of prepared BiNbO4 decreases.

Item Type: Article
Subjects: Q Science > QD Chemistry
Depositing User: APLOS Library
Date Deposited: 09 Jul 2022 04:10
Last Modified: 09 Jul 2022 04:10
URI: http://eprints.asianrepository.com/id/eprint/722

Actions (login required)

View Item
View Item