Journal
CURRENT APPLIED PHYSICS
Volume 34, Issue -, Pages 112-121Publisher
ELSEVIER
DOI: 10.1016/j.cap.2021.11.013
Keywords
ZnO/PANI composite; Humidity sensor; First principle; Lattice oxygen
Funding
- National Natural Science Foundation of China [62064011, BS150219]
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ZnO/PANI composite humidity sensor prepared by hydrothermal method exhibits high humidity sensitivity. The oxygen vacancy on ZnO surface facilitates water molecule adsorption, while the {0 0 0 (1) over bar} crystal plane shows strong adsorption capacity for water molecules. Introducing PANI increases water molecule adsorption and ion proportion, leading to enhanced sensor performance.
ZnO/PANI composite humidity sensor was prepared by hydrothermal method. The first principles of density functional theory study the sensing mechanism. The calculation shows that the oxygen vacancy on ZnO surface is beneficial to the adsorption of water molecules. The {0 0 0 (1) over bar} crystal plane with the largest lattice oxygen number in ZnO has a strong adsorption capacity for water molecules, which is also conducive to improving the humidity sensitivity. PANI is easy to be combined on {0 1(1) over bar 0} plane of ZnO, and it indirectly promotes the growth of {0 0 0(1) over bar} plane, increasing the adsorption of water molecules and the proportion of H(+ )and H3O+ ions. In addition, the N-H group in ZnO/PANI enhances the H+ conduction, which further improves the performance of the sensor. The results concluded that the proportion of lattice oxygen in humidity sensor is an important factor of humidity sensor sensitive detection.
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