First Images of Oxygen Atoms
Manganese oxides, or manganites, are technologically important materials, used widely as solid oxide fuel cell cathodes. They have also been shown to exhibit electroresistance, a property which may be exploited to create resistive memory cells, or "memristors". Oxygen bulk diffusion and surface exchange processes are crucial processes for both catalytic action and electroresistance: to better understand these processes, it is desirable to be able to image individual surface oxygen defects.
In a recent paper, researchers at the London Centre for Nanotechnology, in collaboration with the University of Geneva, Japan Science and Technology Agency and the University of Tokyo, have shown the first atomic resolution images of oxygen defects at a manganite surface, using ultra-high vacuum scanning tunnelling microscopy.
This experiment revealed an atomically flat surface for the layered manganite PrSr2Mn2O7, and also a surface with defects, identified as oxygen adatoms and vacancies. Defect dynamics, including oxygen adatom migration, vacancy-adatom recombination and adatom bistability, were observed using time-resolved scanning tunnelling microscopy and spectroscopy. These data provide an experimental basis for testing models of oxygen migration at transition-metal oxide interfaces, and thereby suggest future strategies for optimizing catalytic reactions at manganite surfaces.
This work has been published in Nature Communications.
Previous Story: Researchers Predict Optical Properties of Nanostructures Using New Model
Next Story: New Device Spots Cancer Cells On The Fly
The Institute of Nanotechnology puts significant effort into ensuring that the information provided on its news pages is accurate and up-to-date. However, we cannot guarantee absolute accuracy. Consequently, the Institute of Nanotechnology disclaims any and all responsibility for inaccuracy, omission or any kind of deficiency in relation to the news items and articles hosted herein.
- 14 August 2014“Trojan horse” treatment could beat brain tumours
- 13 August 2014Copper foam turns CO2 into useful chemicals
- 29 July 2014Nanotechnology and tyres: Greening industry and transport
- 22 July 2014Supporting Recommendations for Future Topics in Horizon 2020
- 17 June 20142014 edition of European NanoSafety Cluster Compendium now online
- View All