US EPA

4848801 

Journal Article 

Directional dependent piezoelectric effect in CVD grown monolayer MoS2 for flexible piezoelectric nanogenerators 

Kim, SK; Bhatia, R; Kim, TaeHo; Seol, D; Kim, JHo; Kim, H; Seung, W; Kim, Y; Lee, YHee; Kim, SWoo 

2016 

1 

Nano Energy
ISSN: 2211-2855
EISSN: 2211-3282 

22 

483-489 

10.1016/j.nanoen.2016.02.046 

WOS:000374625300046 

Due to the interesting semiconducting and optical properties of transition metal dichalcogenides, they have received particular attention for novel electronics and optoelectronics. In addition it is expected that piezoelectric properties of two-dimensional (2D) layered materials are very useful to realize next generation mechanically powered transparent flexible charge-generating devices. Here we report directional dependent piezoelectric effects in chemical vapor deposition grown monolayer MoS2 for flexible piezoelectric nanogenerators (NGs). It was found that the output power obtained from the NG with the armchair direction of MoS2 is about two times higher than that from the NG with the zigzag direction of MoS2 under the same strain of 0.48% and the strain velocity of 70 mm/s. This study provides a new way to effectively harvest mechanical energy using novel flexible piezoelectric NGs based on 2D semiconducting piezoelectric MoS2 for powering low power-consuming electronics and realizing self-powered sensors. (C) 2016 Elsevier Ltd. All rights reserved. 

Molybdenum disulfide; Directional dependent piezoelectricity; Piezoresponse force microscopy; Electromechanical coupling; Nanogenerator