Date of Award
Master of Science (MS)
Saleh Thaker Mahmoud
The rapid increase in environmental pollution has become a major concern, and its monitoring has evolved into a priority for human health. This fact has directed the researchers to make more efforts to find new techniques for the detection of gases hazardous to the environment and human health. With the tremendous advances in technology, gas-sensing devices have become popularly used in environmental applications to detect various toxic gases at very low concentrations.
This work aims at developing high-performance gas sensors with enhanced sensitivity, selectivity, low response time, and low operating temperature. The proposed sensors are fabricated based on the integration of nanotechnology and conducting polymer technology. A polymer solution comprised of polyvinyl alcohol (PVA) and ionic liquid (IL) has been blended once with zinc oxide nanoparticles (ZnO Nps) and another with the copper-based metal-organic framework (Cu-MOF) to obtain two distinct flexible membranes. These membranes were assessed for their performance against hazardous gases at room temperature (RT=23°C). The ZnO/PVA/IL and Cu-MOF/PVA/IL membranes showed high sensitivity toward hydrogen sulfide (H2S) gas with a detection limit of 15 ppm and 1 ppm, and low time response of 24 s and 12 s respectively at RT.
Considering this low operating temperature, external heating elements are not required hence the fabrication and operational costs are reduced. The sensors also showed excellent repeatability, long-term stability, and selectivity toward H2S gas among other gases. Therefore, this study demonstrates the potential of fabricating high-performance gas sensors for monitoring H2S gas in real-time with high efficiency.
AlTakroori, Husam H.D, "FABRICATION AND CHARACTERIZATION OF NANOSTRUCTURED HYBRID MATERIALS FOR GAS SENSING APPLICATIONS" (2022). Theses. 917.