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H2S Gas Sensing Characterization of Nano-Structured SnO2-CuO Multilayer Sensor
Salehi, Farnaz | 2015
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- Type of Document: M.Sc. Thesis
- Language: English
- Document No: 47133 (56)
- University: Sharif University of Technology, International Campus, Kish Island
- Department: Science and Engineering
- Advisor(s): Ghorbani, Mohammad
- Abstract:
- 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
- Keywords:
- Dipping ; Nanostructural Thin Films ; Sensing ; Hydrogen Sulfide ; Sol-Gel Method ; Hydrogen Sulfide Sensor ; Tin Oxide-Cupper Oxide Thin Film
Digital Object List
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محتواي کتاب
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- Chapter 1
- Chapter 2
- 1 Literature Review
- 2-1- The resistive metal oxide gas sensors
- 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
- 1 Literature Review
- 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
- 3-4- Dip coating mechanism and device
- 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
- 3-8- Study of the sensing properties
- 1 Experimental Method
- Chapter 4