期刊
SENSORS AND ACTUATORS B-CHEMICAL
卷 263, 期 -, 页码 436-444出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2018.01.110
关键词
Humidity sensor; Superhydrophilic; ZnO nanoneedle; In-situ growth; QCM
资金
- National Natural Science Foundation of China [61371021, 61527818]
- Shanghai Education Commission (Peak Discipline Construction)
Humidity sensors have attracted intensive interest due to their significant air humidity monitoring values. But it is still a challenge in achieving highly sensitive and accurate humidity sensors with a rapid and convenient method. And only few studies examined the relationship between the sensing and the wetting behavior of sensing materials. Here, we propose a novel strategy for designing humidity sensor by using superhydrophilic ZnO nanoneedle array. Via this smart design, superhydrophilic ZnO nanoneedle array was first in-situ grown on the electrode of quartz crystal microbalance (QCM) transducers by a facile chemical deposition method in solution. The design admits the water molecule easily reach the internal and outer surface of the array, further form multi-molecular-layer adsorption mode on the surface based on a physical adsorption effect between water molecule and superhydrophilic ZnO nanoneedle array. The characterization and sensing results show that the sensors constructed from superhydrophilic ZnO nanoneedles with a defined morphology exhibit enhanced humidity sensing properties including high sensitivity (21.4 Hz/%RH, at 95%RH), fast response/recovery speed (2 s/2 s, at 33%RH), well reproducibility, and narrow hysteresis (Maximum 2%RH) compared with the hydrophilic ZnO seeds and the superhydrophobic ZnO nanoneedles. Finally, the humidity sensing mechanism was also discussed in detail. (C) 2018 Published by Elsevier B.V.
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