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Tunable Work Function of Mg x Zn 1- x O as a Viable Friction Material for a Triboelectric Nanogenerator.
- Source :
-
ACS applied materials & interfaces [ACS Appl Mater Interfaces] 2019 Jan 09; Vol. 11 (1), pp. 1420-1425. Date of Electronic Publication: 2018 Dec 27. - Publication Year :
- 2019
-
Abstract
- Since the invention of triboelectric nanogenerators (TENGs), their output performance has been improved through various approaches such as material surface modification, device structure optimization, and so on, but rarely through the development of new friction materials. In this work, a magnetron sputtered Mg <subscript>x</subscript> Zn <subscript>1- x</subscript> O film is developed as a viable friction material that rubs against polydimethylsiloxane in a TENG. The work function, measured by Kelvin probe microscopy, of the Mg <subscript>x</subscript> Zn <subscript>1- x</subscript> O films can be effectively tuned by varying Mg composition, x, and exposed surface facets, which are shown to dominate the charge-transfer behavior. In addition, film thickness also plays an important role, affecting the output performance. The output voltage and total charge of a TENG with a Mg <subscript>x</subscript> Zn <subscript>1- x</subscript> O film are demonstrated to be tremendously enhanced by 55 and 90 times, respectively, compared to that of a TENG with a ZnO film. Even more intriguingly, the tribo-output polarity can be reversed by adjusting the relative work function through varying the preferred growth orientation of the Mg <subscript>x</subscript> Zn <subscript>1- x</subscript> O film, for a given value of Mg content.
Details
- Language :
- English
- ISSN :
- 1944-8252
- Volume :
- 11
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- ACS applied materials & interfaces
- Publication Type :
- Academic Journal
- Accession number :
- 30550263
- Full Text :
- https://doi.org/10.1021/acsami.8b17416