Studies on gas sensors based on zinc oxide nanorods | |
| Author | Niti Wiromrat |
| Call Number | AIT Thesis no.ME-08-08 |
| Subject(s) | Liquefied petroleum gas Zinc oxide |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering in Microelectronics, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ME-08-08 |
| Abstract | An accidental leak of dangerous substances i.e. toxic gases, volatile organic compounds and combustible gases could have catastrophic effects on livelihoods. In order to avoid the risk of an accident that occurs from a gas leak, it is necessary to find out an effective tool to detect and prevent. Recently, one dimension metal oxide nanostructures i.e. nanorods (NRs), nanowires (NWs) etc. have received enormous attention for their great potential in building nanoscale electronics, especially for gases leak detectors. In our work, the ZnO nanorods that have been successfully fabricated on a simple microscope glass substrate using hydrothermal growth method to detect liquid petroleum (LP) gas in which sensing mechanism is based on baseline resistance change during exposure to LP gas. Moreover, a nobel metal such as platinum (Pt) in form of nanoparticles was prepared and applied as a sensitizer on the active layer of the sensor in order to improve sensor performance. It was observed that the sensor performance improves in terms of gas sensitivity and sensor stability of ZnO when Pt was employed as a catalyst providing better outcome to both LPG and ethanol when compared to ZnO without any catalyst materials (up to 58% sensitivity was achieved for the LPG showing at 9000ppm and about 25%for ethanol at 6000ppm). Moreover, the other advantage of Pt implementation is also the achievement of the maximum sensitivity at lower operation temperatures. These devices can be applied as gas sensors to detect LPG and ethanol and are suitable for concentration ranges that vary around 1000 to 20,000ppm. |
| Year | 2008 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ME-08-08 |
| Type | Thesis |
| School | School of Engineering and Technology (SET) |
| Department | Department of Industrial Systems Engineering (DISE) |
| Academic Program/FoS | Microelectronics (ME) |
| Chairperson(s) | Dutta, Joydeep |
| Examination Committee(s) | Chanchana Thanachayanont;Nowarat Coowanitwong |
| Scholarship Donor(s) | RTG Fellowship |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2008 |