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- Title
Enhancing performances of a ZnO QDs-based humisensor by a simple LiCl loading: impedance spectroscopy and modeling investigations.
- Authors
Sakly, Nawfel; Said, Ayoub; Ouada, Hafedh
- Abstract
Uncapped ZnO QDs were used as a host to load LiCl salt at various contents for preparing humidity sensitive blends according to a straightforward method. The humidity sensitive characteristics of the prepared resistive-type sensors were investigated by impedance spectroscopy at different relative humidity levels. Compared to the pure ZnO QDs, an optimal LiCl content of 1.2 wt% improved all the humidity sensing performances. The impedance of the optimum sensor changed near four orders of magnitude over the whole humidity range, with a good linearity, negligible hysteresis, good long-term stability and short response and recovery times (11 and 4 s, respectively) at 100 Hz. Several considerations were taken into account including AFM and BET analyses, surface charge density, and numerical fitting results of the Cole-Cole impedance spectra to elucidate the major causes of sensor characteristics improvement.
- Subjects
ZINC oxide synthesis; ZINC oxide spectra; QUANTUM dot synthesis; LITHIUM chloride; IMPEDANCE spectroscopy; HYGROMETRY
- Publication
Journal of Materials Science: Materials in Electronics, 2015, Vol 26, Issue 6, p3440
- ISSN
0957-4522
- Publication type
Article
- DOI
10.1007/s10854-015-2853-2