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Cold spray process to produce Te and TeO2 thin films for gas sensors
Dissertant
Thesis advisor
University
University of Technology
Faculty
-
Department
Department of Materials Engineering
University Country
Iraq
Degree
Master
Degree Date
2012
English Abstract
In this work, Tellurium (Te) and Tellurium oxide (TeO2) thin films were successfully prepared by cold spray process using inert atmosphere using helium gas without employing any catalyst.
(Te) and (TeO2) dry powders were sprayed onto different substrates of Si (111) wafer, Al foil, and glass by heating carrier gas at 200,300,400 and 500 °C and 20 bar gas pressure onto substrates of 180±5°C at different angles 0°,30°,45°, to study the effects of these parameters on the resulted microstructure.
The produced thin films were examined by X-ray diffraction analysis (XRD), and Scanning Electron Microscopy (SEM) in addition to Atomic Force Microscopy (AFM).
Scanning electron microscopy images and X-ray diffraction patterns show that the as-synthesized Te has the hexagonal structure, and TeO2 has the tetragonal structure.
SEM images show that the Te thin films have different diameters ranging from 100 to 350 nm, while the TeO2 thin films have different diameters ranging from 200 to 250 nm.
The Te thin film exhibited a high transmission rate of about (95%), while the TeO2 thin film have a maximum transmission rate of about (49%) which allow the products to have potential applications in transparent devices.
The NH3 gas sensors were prepared of the Te and TeO2 thin films ,which were deposited onto (Si (111), Al) substrates.
Thus, the Te and TeO2 thin films demonstrated their potential application in low power consumption device for NH3 sensor.
Main Subjects
Engineering & Technology Sciences (Multidisciplinary)
Topics
American Psychological Association (APA)
Hamdi, Sinan Salman. (2012). Cold spray process to produce Te and TeO2 thin films for gas sensors. (Master's theses Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-419281
Modern Language Association (MLA)
Hamdi, Sinan Salman. Cold spray process to produce Te and TeO2 thin films for gas sensors. (Master's theses Theses and Dissertations Master). University of Technology. (2012).
https://search.emarefa.net/detail/BIM-419281
American Medical Association (AMA)
Hamdi, Sinan Salman. (2012). Cold spray process to produce Te and TeO2 thin films for gas sensors. (Master's theses Theses and Dissertations Master). University of Technology, Iraq
https://search.emarefa.net/detail/BIM-419281
Language
English
Data Type
Arab Theses
Record ID
BIM-419281