Abstract:
:Giant optical transmittance changes of over 300% in wide wavelength range from 500 nm to 2500 nm were observed in LaBaCo2O5.5+δ thin films annealed in air and ethanol ambient, respectively. The reduction process induces high density of ordered oxygen vacancies and the formation of LaBaCo2O5.5 (δ = 0) structure evidenced by aberration-corrected transmission electron microscopy. Moreover, the first-principles calculations reveal the origin and mechanism of optical transmittance enhancement in LaBaCo2O5.5 (δ = 0), which exhibits quite different energy band structure compared to that of LaBaCo2O6 (δ = 0.5). The discrepancy of energy band structure was thought to be the direct reason for the enhancement of optical transmission in reducing ambient. Hence, LaBaCo2O5.5+δ thin films show great prospect for applications on optical gas sensors in reducing/oxidizing atmosphere.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Cheng S,Lu J,Han D,Liu M,Lu X,Ma C,Zhang S,Chen Cdoi
10.1038/srep37496subject
Has Abstractpub_date
2016-11-23 00:00:00pages
37496issn
2045-2322pii
srep37496journal_volume
6pub_type
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