TY - JOUR
T1 - Tunable Work Function of Mg x Zn 1-x O as a Viable Friction Material for a Triboelectric Nanogenerator
AU - Guo, Qi Zhen
AU - Yang, Liang Ciao
AU - Wang, Ruey Chi
AU - Liu, Chuan Pu
N1 - Funding Information:
The authors acknowledge the financial support from the Ministry of Science and Technology of Taiwan under grants MOST 104-2221-E-006-078-MY3 and MOST 104-2221-E- 006-079-MY3. The authors wish to thank the Center for Micro/Nano Science and Technology, National Cheng Kung University, for providing equipment and technical support. This work was also financially supported by the Hierarchical Green-Energy Materials (Hi-GEM) Research Center, from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) in Taiwan.
PY - 2019/1/9
Y1 - 2019/1/9
N2 - 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 x Zn 1-x 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 x Zn 1-x 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 x Zn 1-x 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 x Zn 1-x O film, for a given value of Mg content.
AB - 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 x Zn 1-x 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 x Zn 1-x 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 x Zn 1-x 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 x Zn 1-x O film, for a given value of Mg content.
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U2 - 10.1021/acsami.8b17416
DO - 10.1021/acsami.8b17416
M3 - Article
C2 - 30550263
AN - SCOPUS:85059842350
VL - 11
SP - 1420
EP - 1425
JO - ACS applied materials & interfaces
JF - ACS applied materials & interfaces
SN - 1944-8244
IS - 1
ER -