Gradient bandgap narrowing in severely deformed ZnO nanoparticles

Yuanshen Qi; Yaron Kauffmann; Anna Kosinova; Askar R. Kilmametov; Boris B. Straumal; Eugen Rabkin

doi:10.1080/21663831.2020.1821111

Gradient bandgap narrowing in severely deformed ZnO nanoparticles

Yuanshen Qi^*, Yaron Kauffmann, Anna Kosinova, Askar R. Kilmametov, Boris B. Straumal, Eugen Rabkin^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

12 Scopus citations

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.Impact statement We uncover a gradient of oxygen vacancy concentration and concomitant bandgap narrowing in an individual metal oxide nanoparticle processed by a combination of severe shearing and frictional sliding deformation.

Original language	English
Pages (from-to)	58-64
Number of pages	7
Journal	Materials Research Letters
Volume	9
Issue number	1
DOIs	https://doi.org/10.1080/21663831.2020.1821111
State	Published - 2 Jan 2021
Externally published	Yes

Keywords

Bandgap
STEM-EELS
ZnO
gradient-structured materials
high-pressure torsion

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10.1080/21663831.2020.1821111

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title = "Gradient bandgap narrowing in severely deformed ZnO nanoparticles",

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.Impact statement We uncover a gradient of oxygen vacancy concentration and concomitant bandgap narrowing in an individual metal oxide nanoparticle processed by a combination of severe shearing and frictional sliding deformation.",

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author = "Yuanshen Qi and Yaron Kauffmann and Anna Kosinova and Kilmametov, {Askar R.} and Straumal, {Boris B.} and Eugen Rabkin",

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doi = "10.1080/21663831.2020.1821111",

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AU - Qi, Yuanshen

AU - Kauffmann, Yaron

AU - Kosinova, Anna

AU - Kilmametov, Askar R.

AU - Straumal, Boris B.

AU - Rabkin, Eugen

PY - 2021/1/2

Y1 - 2021/1/2

N2 - 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.Impact statement We uncover a gradient of oxygen vacancy concentration and concomitant bandgap narrowing in an individual metal oxide nanoparticle processed by a combination of severe shearing and frictional sliding deformation.

AB - 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.Impact statement We uncover a gradient of oxygen vacancy concentration and concomitant bandgap narrowing in an individual metal oxide nanoparticle processed by a combination of severe shearing and frictional sliding deformation.

KW - Bandgap

KW - STEM-EELS

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KW - gradient-structured materials

KW - high-pressure torsion

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Gradient bandgap narrowing in severely deformed ZnO nanoparticles

Abstract

Keywords

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