Loading…
Phase transformation and room temperature stabilization of various Bi 2 O 3 nano-polymorphs: effect of oxygen-vacancy defects and reduced surface energy due to adsorbed carbon species
We report the grain growth from the nanoscale to microscale and a transformation sequence from Bi →β-Bi O →γ-Bi O →α-Bi O with the increase of annealing temperature. The room temperature (RT) stabilization of β-Bi O nanoparticles (NPs) was attributed to the effect of reduced surface energy due to ad...
Saved in:
| Published in: | Nanoscale 2020-12, Vol.12 (47), p.24119-24137 |
|---|---|
| Main Authors: | , , , , , , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| Summary: | We report the grain growth from the nanoscale to microscale and a transformation sequence from Bi →β-Bi
O
→γ-Bi
O
→α-Bi
O
with the increase of annealing temperature. The room temperature (RT) stabilization of β-Bi
O
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 γ-Bi
O
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 Bi
O
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 Bi
O
nano-polymorphs, which is significant from theoretical consideration. |
|---|---|
| ISSN: | 2040-3364 2040-3372 |
| DOI: | 10.1039/D0NR06552H |