Phase transformation and room temperature stabilization of various Bi2O3 nano-polymorphs: effect of oxygen-vacancy defects and reduced surface energy due to adsorbed carbon species

被引：32

作者：

Gandhi, Ashish Chhaganlal ^{[1
]}

Lai, Chi-Yuan ^{[1
]}

Wu, Kuan-Ting ^{[1
]}

Ramacharyulu, P. V. R. K. ^{[1
]}

Koli, Valmiki B. ^{[1
]}

Cheng, Chia-Liang ^{[1
]}

Ke, Shyue-Chu ^{[1
]}

Wu, Sheng Yun ^{[1
]}

机构：

[1] Natl Dong Hwa Univ, Dept Phys, Hualien 97401, Taiwan

来源：

NANOSCALE | 2020年 / 12卷 / 47期

关键词：

EFFICIENT PHOTOCATALYTIC DEGRADATION; BISMUTH OXIDE; BETA-BI2O3; NANOPARTICLES; CONTROLLABLE SYNTHESIS; THERMAL-STABILITY; THIN-FILMS; IN-SITU; METASTABLE GAMMA-BI2O3; ELECTRONIC-STRUCTURE; OPTICAL-PROPERTIES;

D O I：

10.1039/d0nr06552h

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We report the grain growth from the nanoscale to microscale and a transformation sequence from Bi -> beta-Bi2O3 -> gamma-Bi2O3 -> alpha-Bi2O3 with the increase of annealing temperature. The room temperature (RT) stabilization of beta-Bi2O3 nanoparticles (NPs) was attributed to the effect of reduced surface energy due to adsorbed carbon species, and oxygen vacancy defects may have played a significant role in the RT stabilization of gamma-Bi2O3 NPs. An enhanced red emission band was evident from all the samples attributed to oxygen-vacancy defects formed during the growth process in contrast with the observed white emission band from the air annealed Bi ingots. Based on our experimental findings, the air annealing induced oxidation of Bi NPs and transformation mechanism within various Bi2O3 nano-polymorphs are presented. The outcome of this study suggests that oxygen vacancy defects at the nanoscale play a significant role in both structural stabilization and phase transformation within various Bi2O3 nano-polymorphs, which is significant from theoretical consideration.

引用

页码：24119 / 24137

页数：19

共 155 条

[1] Controllable synthesis of a and β-Bi2O3 through anodization of thermally evaporated bismuth and its characterization [J].

Ahila, M. ;

Malligavathy, M. ;

Subramanian, E. ;

Padiyan, D. Pathinettam .

SOLID STATE IONICS, 2016, 298 :23-34

[2] Heat treatment effect on crystal structure and design of highly sensitive room temperature CO2 gas sensors using anodic Bi2O3 nanoporous formed in a citric acid electrolyte [J].

Ahila, M. ;

Dhanalakshmi, J. ;

Selvakumari, J. Celina ;

Padiyan, D. Pathinettam .

MATERIALS RESEARCH EXPRESS, 2016, 3 (10)

[3] Monoclinic α-Bi2O3 photocatalyst for efficient removal of gaseous NO and HCHO under visible light irradiation [J].

Ai, Zhihui ;

Huang, Yu ;

Lee, Shuncheng ;

Zhang, Lizhi .

JOURNAL OF ALLOYS AND COMPOUNDS, 2011, 509 (05) :2044-2049

[4] A new high-pressure phase of bismuth oxide [J].

Atou, T ;

Faqir, H ;

Kikuchi, M ;

Chiba, H ;

Syono, Y .

MATERIALS RESEARCH BULLETIN, 1998, 33 (02) :289-292

[5] Stabilization of beta-Bi2O3, by hafnia [J].

Ayala, A ;

LopezGarcia, A ;

Leyva, AG ;

deBenyacar, MAR .

SOLID STATE COMMUNICATIONS, 1996, 99 (06) :451-455

[6] Ultrasound-assisted preparation and characterization of β-Bi2O3 nanostructures: Exploring the photocatalytic activity against rhodamine B [J].

Azizian-Kalandaragh, Yashar ;

Sedaghatdoust-Bodagh, Farzad ;

Habibi-Yangjeh, Aziz .

SUPERLATTICES AND MICROSTRUCTURES, 2015, 81 :151-160

[7] Mechanosynthesis of Nanocrystalline Fully Stabilized bcc γ-phase of Bi2O3 without Any Additive: Manifestation of Ferroelasticity in Microstructure, Optical, and Transport Properties [J].

Bandyopadhyay, S. ;

Dutta, S. ;

Dutta, A. ;

Pradhan, S. K. .

CRYSTAL GROWTH & DESIGN, 2018, 18 (11) :6564-6572

[8] Microstructure and charge carrier dynamics in Dy substituted phase stabilized cubic Bi2O3 [J].

Bandyopadhyay, Swagata ;

Dutta, Abhigyan .

RSC ADVANCES, 2015, 5 (80) :65123-65132

[9] Spray deposited β-Bi2O3 nanostructured films with visible photocatalytic activity for solar water treatment [J].

Barrera-Mota, Karen ;

Bizarro, Monserrat ;

Castellino, Micaela ;

Tagliaferro, Alberto ;

Hernandez, Aracely ;

Rodil, Sandra E. .

PHOTOCHEMICAL & PHOTOBIOLOGICAL SCIENCES, 2015, 14 (06) :1110-1119

[10] THE LUMINESCENCE OF YTTRIA STABILIZED ZIRCONIA DOPED WITH BI2O3 [J].

BLASSE, G ;

ZHIRAN, H ;

WINNUBST, AJA ;

BURGGRAAF, AJ .

MATERIALS RESEARCH BULLETIN, 1984, 19 (08) :1057-1062

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