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H2S Gas Sensing Characterization of Nano-Structured SnO2-CuO Multilayer Sensor

Salehi, Farnaz | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 47133 (56)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Ghorbani, Mohammad
  7. Abstract:
  8. Hydrogen sulfide, H2S, is a toxic gas and has detrimental effects on human health and the oil and gas industry. Therefore, its identification is very important. According to the devastating effects of this gas, then, the general mechanisms have been studied for gas detection. In addition, by highlighting the benefits of the multilayer nanostructure electrochemical sensors, an applicable and efficient method for the industrial production of these sensors has been investigated. In this regard, the sol-gel method is used to prepare the SnO2-CuO multilayer thin film and the advantages of this method was compared to PVD method. Also sensor properties of both deposition methods have been compared. Since the sensor working temperature approach was ambient temperature, the sensing behavior of the thin films resistances was plotted and evaluated. Characterization of the coated layers was done using scanning electron microscope, and atomic force microscope used to obtain the surface profile. Structure and composition were studied by the means of the EDS and XRD methods. SnO2-CuO multilayer sensors has been coated on glass substrates by sol-gel, dip coat method, prior to heat treated at 400 °C for 5 h. This coating process resulted in optimum sensing characteristics, which are response of 1180 in 43 seconds, with recovery time of 420 seconds. In conclusion the best outcome of this study was improvement of the response and recovery time
  9. Keywords:
  10. Dipping ; Nanostructural Thin Films ; Sensing ; Hydrogen Sulfide ; Sol-Gel Method ; Hydrogen Sulfide Sensor ; Tin Oxide-Cupper Oxide Thin Film

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  • Chapter 1
    • 1 Introduction
      • 1-1- Destructive effects of H2S in oil and gas industries
        • 1-1-1- The effect of H2S on the personnel health and safety
        • 1-1-2- The H2S effects on the metals applied in drilling devices
  • Chapter 2
    • 1 Literature Review
      • 2-1- The resistive metal oxide gas sensors
        • 2-1-1- Definition and gas sensor relevant parameters
      • 2-2- Metal oxide gas sensor components and materials
      • 2-3- SnO2 deposition
      • 2-4- Mechanisms for Gas Sensing in Pure SnO2 Sensor
      • 2-5- Effects of additives on sensing behavior
      • 2-6- Composite gas sensors
      • 2-7- Study of the SnO2-CuO sensors
      • 2-8- Multilayer sensing mechanism
      • 2-9- Thickness, as a parameter that affects the sensing behavior
  • Chapter 3
    • 1 Experimental Method
      • 3-1- Substrate preparation
      • 3-2- Preparation of the Tin oxide layer using Physical Vapor Deposition
      • 3-3- Sol preparation
        • 3-3-1- SnO2 Sol
        • 3-3-2- CuO sol
      • 3-4- Dip coating mechanism and device
        • 3-4-1- Fabrication of the Dip-Coater device
          • 3-4-1-1- Linear motion
          • 3-4-1-2- Electrical
          • 3-4-1-3- Firmware
        • 3-4-2- Coating SnO2 and CuO multilayers using Sol-Gel method
      • 3-5- Study the surface topography by Atomic Force Microscopy (AFM)
      • 3-6- Study the morphology by Scanning Electron Microscopy (SEM)
      • 3-7- Crystallographic investigation
        • 3-7-1- Calculating the crystallite size of the synthetic nano particles
      • 3-8- Study of the sensing properties
        • 3-8-1- Resistance logger preparation
          • 3-8-1-1- Resistance measurement
          • 3-8-1-2- PC application
  • Chapter 4
    • 1 Results and Discussion
      • 4-1- Study the structure of the coatings
      • 4-2- Analysis of the Coating Structure by X-Ray Diffraction
        • 4-2-1- Calculating the crystalline size of the synthetic nano particles
      • 4-3- Study the sensing properties
    • Conclusion
    • 2 Recommendation for Further Study
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