Journal
NANOSCALE
Volume 12, Issue 12, Pages 6844-6851Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c9nr10221c
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Funding
- Singapore National Research Foundation under its Competitive Research Funding 'Oxide Electronics on silicon beyond Moore' [NRF-CRP15-2015-01]
- Singapore Ministry of Education under its Tier 2 grant [MOE2017-T2-1-129]
- National Natural Science Foundation of China [51901013]
- Fundamental Research Funds for the Central Universities (University of Science and Technology Beijing) [06500135]
- Opening Project of National Joint Engineering Research Center for Abrasion Control and Molding of Metal Materials, Henan University of Science and Technology [HKDNM201906]
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Grain boundaries could exhibit exceptional electronic structure and exotic properties, which are determined by a local atomic configuration and stoichiometry that differs from the bulk. However, optical and plasmonic properties at the grain boundaries in metallic oxides have rarely been discussed before. Here, we show that non-stoichiometric grain boundaries in the newly discovered metallic SrNbO3 photocatalyst show exotic electronic, optical and plasmonic phenomena in comparison to bulk. Aberration-corrected scanning transmission electron microscopy and first-principles calculations reveal that a Nb-rich grain boundary exhibits an increased carrier concentration with quasi-1D metallic conductivity, and newly induced electronic states contributing to the broad energy range of optical absorption. More importantly, dielectric function calculations reveal extended and enhanced plasmonic excitations compared with bulk SrNbO3. Our results show that non-stoichiometric grain boundaries might be utilized to control the electronic and plasmonic properties in oxide photocatalysis.
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