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Fabrication of ZnO/CNTs for Application in $CO_{2}$ Sensor at Room Temperature
| Content Provider | MDPI |
|---|---|
| Author | Saad, Rana Gamal, Ahmed Zayed, Mohamed Ahmed, Ashour M. Shaban, Mohamed Sabt, Mohammad Bin Rabia, Mohamed Hamdy, Hany |
| Copyright Year | 2021 |
| Description | Thin films of ZnO and ZnO/carbon nanotubes (CNTs) are prepared and used as $CO_{2}$ gas sensors. The spray pyrolysis method was used to prepare both ZnO and ZnO/CNTs films, with CNTs first prepared using the chemical vapor deposition method (CVD). The chemical structure and optical analyses for all the prepared nanomaterials were performed using X-ray diffraction (XRD), Fourier transformer infrared spectroscopy (FTIR), and UV/Vis spectrophotometer devices, respectively. According to the XRD analysis, the crystal sizes of ZnO and ZnO/CNTs were approximately 50.4 and 65.2 nm, respectively. CNTs have average inner and outer diameters of about 3 and 13 nm respectively, according to the transmitted electron microscope (TEM), and a wall thickness of about 5 nm. The detection of $CO_{2}$ is accomplished by passing varying rates of the gas from 30 to 150 sccm over the prepared thin-film electrodes. At 150 sccm, the sensitivities of ZnO and ZnO/CNTs sensors are 6.8% and 22.4%, respectively. The ZnO/CNTs sensor has a very stable sensitivity to $CO_{2}$ gas for 21 days. Moreover, this sensor has a high selectivity to $CO_{2}$ in comparison with other gases, in which the ZnO/CNTs sensor has a higher sensitivity to $CO_{2}$ compared to $H_{2}$ and $C_{2}H_{2}$. |
| Starting Page | 3087 |
| e-ISSN | 20794991 |
| DOI | 10.3390/nano11113087 |
| Journal | Nanomaterials |
| Issue Number | 11 |
| Volume Number | 11 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2021-11-16 |
| Access Restriction | Open |
| Subject Keyword | Nanomaterials Zno/cnts Thin Film Co2 Gas Sensor Response Stability Spray Pyrolysis |
| Content Type | Text |
| Resource Type | Article |
