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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 48506 (06)
- University: Sharif University of Technology
- Department: Chemical and Petroleum Engineering
- Advisor(s): Soltanieh, Mohammad; Rashidi, Alimorad; Izadi Yazdan Abadi, Nosrat
- Abstract:
- Due production and use of large amount of chemical and emissions of pollutants in air, detection and control of these compounds are necessary. One of the common methods to detect these pollutants in the ambient is using metal oxide semiconductor sensors. However, these types of sensors suffer from low selectivity toward a certain compound in the mixture of different gas components. In this study, the object was to investigate the effect of different amount of CNTs on performance of tin oxide to improve their selectivity for detection of 50 ppm of hydrogen sulfide at low temperature. To perform the study, nanoparticles of pure tin oxide and SnO2 base hybrids containing 0.25wt%, 0.5wt%, 2.5wt% and 5wt% of CNTs were synthesized via hydrothermal method and employed as sensing materials. All samples were characterized by XRD and ASAP techniques. Characterization results showed that addition of CNTs in a certain amount causes an increase in surface area and a decrease in the particle size of the sensing material. Moreover, the SEM images confirmed the presence of CNTs in structure of hybrid materials. Then the sensitivity of the sensors was determined in the presence of 50 ppm of H2S at temperature range of 100-250 °C. The results revealed that the 0.5wt% CNTs hybrid have highest sensitivity to the target gas among other hybrids in a low temperature of 100°C
- Keywords:
- Gas Sensor ; Hydrogen Sulfide ; Tin Dioxide ; Carbon Nanotubes ; Organo-Sulfur Compound ; Volatile Organic Compound (VOC)
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