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- Title
The Sensitizing Effect of Enhanced NO<sub>2</sub> Gas Sensing at Near-Room Temperature Using Pd-Decorated VO<sub>2</sub> Nanowires.
- Authors
Liu, Shuai; Xue, Jiale; Liu, Yinggang; Cui, Yan; Qiu, Jie; Xu, Ruojun; Chen, Guoxiang
- Abstract
Modification of nanostructures using metal nanoparticles is an efficient strategy for enhancing the performance of gas sensing. In this paper, a VO2@Pd nanowires gas sensor was synthesized using a combination of hydrothermal and annealing methods. The content of Pd in the as-prepared products was successfully controlled by adjusting the reaction parameters. The morphology and formation mechanism of VO2 nanostructures were systematically evaluated. The response value of VO2@Pd nanowires is 31.94 towards 5 ppm of NO2, which is about 38.75% higher than that of pristine VO2 at a relatively low temperature of 50°C. Furthermore, the sensor exhibits good selectivity, excellent response/recovery time, and superior stability towards NO2. The significant enhancement of NO2 sensing performance could be attributed to the electronic and chemical sensitization. Density functional theory (DFT) simulation suggests that both the adsorption energy and electron transfer between the VO2@Pd substrate and NO2 molecules are optimized synergistically, leading to the improved sensitivity of the gas sensor. Importantly, the strong orbital hybridization between the NO2 molecule and Pd atom is observed according to density of states (DOS), which is beneficial in selectively improving the NO2 sensing performance of the VO2@Pd gas sensor.
- Subjects
NANOWIRES; ORBITAL hybridization; GAS detectors; DENSITY functional theory; CHARGE exchange; METAL nanoparticles; RAMAN scattering
- Publication
Journal of Electronic Materials, 2024, Vol 53, Issue 3, p1461
- ISSN
0361-5235
- Publication type
Article
- DOI
10.1007/s11664-023-10878-w