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Debye-length controlled gas sensing performances in NiO@ZnO p-n junctional core–shell nanotubes
| Content Provider | Scilit |
|---|---|
| Author | Bai, Jing Long Zhao, Changhui Gong, Huiming Wang, Qiao Huang, Baoyu Sun, Geng Zhi Wang, Yanrong Zhou, Jin Yuan Xie, Erqing Wang, Fei |
| Copyright Year | 2019 |
| Description | Journal: Journal of Physics D: Applied Physics To enhance the gas sensing performances, constructing p-n heterostructures is considered as a promising route for designing high-performance gas sensing materials due to their synergistic and p-n junction effects. Especially the shell layers' thickness often plays an important role in the modulation of carrier transport during the gas sensing processes. In this work, we have designed a type of NiO@ZnO core-shell nanotubes (CSNTs) with a thickness-tuneable shell by combining electrospinning with atomic layer deposition (ALD) techniques. Results showed that the NiO@ZnO composite nanofibers possess a uniform tubular structure and comprised of a 230-nm polycrystalline NiO cores and a wrinkled porous ZnO shells with a tuneable thickness (0-50 nm) via ALD cycles. And gas sensing tests showed that the NiO@ZnO CSNTs with shell thickness close to the Debye length showed the highest gas sensitivity, e.g., the response to 100 ppm ethanol was 15.8, which is ~6.5 times that of the pure NiO. Moreover, the assembled sensors also showed excellent stability (almost keeping 100% after one-month tests), increased response speed and improved gas selectivity. Furthermore, based on our series of tests and analysis, a possible gas sensing enhancement mechanism (Debye-length controlled gas sensing mechanism) has been proposed for the gas sensing behaviours of our designed sensors based on NiO@ZnO CSNTs. |
| Related Links | https://iopscience.iop.org/article/10.1088/1361-6463/ab182f/pdf |
| ISSN | 00223727 |
| e-ISSN | 13616463 |
| DOI | 10.1088/1361-6463/ab182f |
| Journal | Journal of Physics D: Applied Physics |
| Issue Number | 28 |
| Volume Number | 52 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 2019-04-10 |
| Access Restriction | Open |
| Subject Keyword | Journal: Journal of Physics D: Applied Physics |
| Content Type | Text |
| Resource Type | Article |
| Subject | Surfaces, Coatings and Films Acoustics and Ultrasonics Condensed Matter Physics Electronic, Optical and Magnetic Materials |
