2026-09-21T23:32:47Z https://www.ideals.illinois.edu/oai-pmh

oai:www.ideals.illinois.edu:2142/34288 2023-07-10 col_2142_5131 col_2142_8888 com_2142_5130 com_2142_8887 com_2142_234

Liu, Gang Logan Syed, Usman 2012-09-18T21:09:42Z 2012-09-18T21:09:42Z 2012-08 2012-09-18T21:09:42Z 2012-08 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. Item withdrawn by Mark Zulauf (zulauf@illinois.edu) on 2012-07-19T13:06:42Z Item was in collections: University of Illinois Theses & Dissertations (ID: 1) No. of bitstreams: 2 Thesis_Syed Usman Ali_Revised_Final.docx: 4944192 bytes, checksum: 82bec69696cedd1f4b4276e779ce2067 (MD5) Syed_Usman.pdf: 3552723 bytes, checksum: 68e4fb40e2e5fc8101da940f1598509a (MD5) Made available in DSpace on 2012-09-18T21:09:42Z (GMT). No. of bitstreams: 3 Syed_Usman.pdf: 3552723 bytes, checksum: 68e4fb40e2e5fc8101da940f1598509a (MD5) license.txt: 4059 bytes, checksum: 1d253ca5b4f07a413deed2e852a07b6d (MD5) Thesis_Syed Usman Ali_Revised_Final.docx: 4944192 bytes, checksum: 82bec69696cedd1f4b4276e779ce2067 (MD5) http://hdl.handle.net/2142/34288 en Copyright 2012 Usman Syed Ion Oxide Silicon Capacitor (iOSCA Metal-Oxide-Silicon capacitors(MOSCAP) Work Function pH Capacitance Ionic Solution Ion oxide silicon capacitor based pH sensing Electrical & Computer Eng Psychology 1933 1299 Electrical & Computer Engr Psychology 1200 0338 University of Illinois at Urbana-Champaign Thesis M.S. MS:Electr & Computer Eng-UIUC 10KS1200MS