Title page for etd-1115102-135102


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URN etd-1115102-135102
Author Shiun-Sheng Jan
Author's Email Address d8531801@student.nsysu.edu.tw
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Department Electrical Engineering
Year 2002
Semester 1
Degree Ph.D.
Type of Document
Language English
Title Study on the pH-sensing characteristics of the hydrogen ion-sensitive field-effect transistors with sol-gel-derived lead titanate series gate
Date of Defense 2002-11-07
Page Count 110
Keyword
  • pH response
  • lead titanate
  • stable response time
  • hysteresis
  • drift
  • ISFET
  • sol-gel
  • lifetime
  • temperature effect
  • Abstract The sol-gel-derived lead titanate (PbTiO3) membrane has been successfully applied as a novel pH-sensing layer to form the PbTiO3 gate ISFET (ion-sensitive field-effect transistor). There exhibit the excellent quasi-Nernstian response of 55-58 mV/pH, good surface adsorption and anticorrosion characteristics via the capacitance- voltage measurement of the electrolyte-insulator-semiconductor structure. At a specific pH concentration, the output and transfer characteristics of the PbTiO3 gate ISFET are very similar to the behaviours of MOSFETs (metal-oxide-semiconductor field-effect transistors), and the pH-ISFET model can be derived by the modified MOSFET model. As it operated in the nonsaturation region, there exhibits a linear pH response of about 55-58 mV/pH. Simultaneously, there exhibit the stable response time of 2-4 minutes, the drift of 0.5-1 mV/h, the hysteresis of 3-5 mV and the reduction rate of about –10 mV/pH-day. On the other hand, as it operated in the saturation region, the pH responses and linearity can be controlled by adjusting the VGS values, e.g. the absolute pH response of 4.2, 24.8 and 31.3 uA/pH and the correlation coefficients of 0.9491, 0.9995 and 0.9996 at VGS= 1, 3 and 5 V can be obtained, respectively. Besides, the PbTiO3 gate ISFET has been modified by doping the Mg2+ and La3+ impurities into the PbTiO3 membrane. As a result, the former is a great benefit to improve the pH-sensing characteristics, which exhibits the pH response of 58-59 mV/pH, the drift of below 0.4 mV/h, the hysteresis of 1-3 mV and the reduction rate of -0.2 mV/pH-day. Finally, a digital pH meter has been successfully developed.
    Advisory Committee
  • Yeong-Her Wang - chair
  • Hsueh-Tao Chou - co-chair
  • Mau-Phon Houng - co-chair
  • Mu-Tsun Tsai - co-chair
  • Jung-Chuan Chou - advisor
  • Ying-Chung Chen - advisor
  • Files
  • etd-1115102-135102.pdf
  • indicate in-campus access immediately and off_campus access in a year
    Date of Submission 2002-11-15

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