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Gradient bandgap narrowing in severely deformed ZnO nanoparticles

Qi, Y.; Kauffmann, Y.; Kosinova, A.; Kilmametov, Askar R.; Straumal, Boris B.; Rabkin, E.

Abstract:
Gradient nanostructured metallic materials with a gradual change of grain boundary and dislocation density display unprecedent mechanical properties. Herein, we uncover a gradient of point defects concentration and concomitant gradient bandgap (E g) narrowing in metal oxide nanoparticles processed by a combination of severe shearing and frictional sliding deformation. Using the valence electron-energy loss spectroscopy technique, we find a gradual decrease of E g from 2.93 eV in the interior to 2.43 eV at the edge of the high-pressure torsion processed ZnO flake-shaped particle. This work paves the way to strain engineering of gradient-structured metal oxide semiconductors for unique functional properties.

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Verlagsausgabe §
DOI: 10.5445/IR/1000125456
Veröffentlicht am 03.11.2020
Originalveröffentlichung
DOI: 10.1080/21663831.2020.1821111
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Nanotechnologie (INT)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2166-3831
KITopen-ID: 1000125456
Erschienen in Materials Research Letters
Band 9
Heft 1
Seiten 58-64
Schlagwörter Bandgap, high-pressure torsion, gradient-structured materials, STEM-EELS, ZnO
Nachgewiesen in Scopus
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