Director of Research (if dissertation) or Advisor (if thesis)
Liu, Gang Logan
Department of Study
Electrical & Computer Eng Psychology
Discipline
Electrical & Computer Engr Psychology
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Date of Ingest
2012-09-18T21:09:42Z
Keyword(s)
Ion Oxide Silicon Capacitor (iOSCA
Metal-Oxide-Silicon capacitors(MOSCAP)
Work Function
pH
Capacitance
Ionic Solution
Abstract
Several biological applications involve measuring intracellular and extracellular pH values. This thesis reports a novel technique that uses the basic principles of a MOSCAP. Based on its functionality, the device is termed as iOSCAP (Ion Oxide Silicon Capacitor). As the name suggests, the device consists of an ionic layer on top of an oxidized Si wafer. The strength of
the ionic solution determines the capacitance of the device, as the ionic strength modifies the work function of the ionic layer, thereby changing the surface potential of the device. The sensitivity of the device based on the results obtained is ~ 100pF/80 L/pH which is sufficient
for the target applications, and the changes can be recorded using an LCR meter. In addition, the device can be used for tracking the intracellular and extracellular changes as its response
time is ~ 5 ns. Light addressability has been tested but it will find more use when specific cell measurements are done. The device has been tested in the lab and can be made commercial by
proper packaging and modeling.
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