Title page for etd-0607115-173952


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URN etd-0607115-173952
Author Shang-Jing Wu
Author's Email Address No Public.
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Department Mechanical and Electro-Mechanical Engineering
Year 2014
Semester 2
Degree Master
Type of Document
Language zh-TW.Big5 Chinese
Title Extended-Gate Field Effect Transistor Produced with Touch Panel Film for Hydrogen Ion Concentration Measurement
Date of Defense 2015-07-07
Page Count 103
Keyword
  • ISFET
  • ITO
  • EGFET
  • touch panel film
  • pH sensor
  • Abstract A high performance ion-sensitive field-effect- transistor (ISFET) based pH sensor utilizing commercial touch panel film (TPF) as the sensing material. The metal oxide layers (ITO/SiO2/Nb2O5) on the TPF is ideal for measuring dissociated hydrogen ions. A high transconductance MOSFET chip composed of 10 parallel FETs provided by CIC is used to convert the effective pH level into the equivalent gate voltage. A high current response of 2.156 mA/V is obtained in On-Film system due to the high transconductance property compared with commercial IC in Off-Film system. The industrial roll-to-roll process for producing the TPF film and the quick plugging slot make the sensing layer suitable for disposable applications. An Ag/AgCl reference electrode will integration on the film after back-end process. The On-film system is also produced to further enhance the sensing performance and reduce the system volume. Results show that the TPF-based pH sensor exhibits good response (60.9 mV/pH) for detecting solutions of the pH values in 3-13. The rapid time response (< 30 s) and good stability (C.V. < 2%) also confirmed the sensing performance of the developed pH sensor under different pH conditions. Observed the difference in surface structure of the sensing film under the scanning electron microscope. The film was mot damage of using less than 60 minutes in the sample solution. Moreover, the sensor also shows low response to the interference ions in various solutions of normal saline, city water and DI water. Results showed that the developed pH sensor was not sensitive to the ionic strength of the sample solutions. In the section of conversion circuit design. This study used an operational amplifier, changing the resistance value of its negative feedback to enhance sensitivity of the system (four to six times). The developed pH sensor has presented its capabilities for rapid and low-cost hydrogen ion detections.
    Advisory Committee
  • Cheng-Tang Pan - chair
  • Ruey-Lue Wang - co-chair
  • Wan-Chun Chuang - co-chair
  • Ying-Zong Juang - co-chair
  • Che-Hsin Lin - advisor
  • Files
  • etd-0607115-173952.pdf
  • Indicate in-campus at 5 year and off-campus access at 5 year.
    Date of Submission 2015-07-22

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