期刊
NANO ENERGY
卷 65, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.nanoen.2019.103974
关键词
Self-powered sensing; Piezoelectric nanogenerator; Au-modified MoSe2 nanoflowers; NH3 sensor; Flexible electronics
类别
资金
- National Natural Science Foundation of China [51777215, 51775306]
- Key Research & Development Plan Project of Shandong Province [2018GSF117002]
- Beijing Municipal Natural Science Foundation [4192027]
- Key Laboratory of Engineering Dielectrics and Its Application (Harbin University of Science and Technology), Ministry of Education [KFZ1801]
Smart sensing devices with high reliability and self-powered features are critical in future generation wearable applications. In this paper, we reported for the first time a room temperature Au-MoSe2 composite ammonia (NH3) sensor driven by a novel flexible piezoelectric nanogenerator (PENG) based on two-dimensional (2D) semiconductor MoS2 flake. Moreover, we also demonstrated the MoS2-based PENG device attached to the human body for harvesting diverse body motion energy, demonstrating its strong potential for applications in wearable devices. A series of characterizations of 2D piezoelectric semiconductor MoS2 and Au-MoSe2 sensing materials were carried out. The Au-MoSe2 composite-based ammonia sensor with MoS2 PENG showed a higher response (V-a/V-g = 29 @ 100 ppm NH3) toward NH3 than that of MoSe2 counterpart (V-a/V-g = 25 @ 100 ppm NH3). And it has superior selectivity and outstanding long-term stability. Moreover, the sensor also has a fast response/recovery time (18 s/16 s) towards 20 ppm NH3. Finally, the enhanced sensing mechanism of Au-MoSe2 composite toward NH3 was discussed by using first-principle calculations based on density functional theory.
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