Title:
A Novel Sensor to Monitor Surface Charge Interactions: The Optically Stimulated Contact Potential Difference Probe

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dc.contributor.advisor Danyluk, Steven
dc.contributor.author Mess, Francis McCarthy en_US
dc.contributor.committeeMember Ajeet Rohatgi
dc.contributor.committeeMember Jiri Janata
dc.contributor.committeeMember Hesketh, Peter J.
dc.contributor.committeeMember Kurfess, Thomas R.
dc.contributor.department Mechanical Engineering en_US
dc.date.accessioned 2006-06-09T18:03:32Z
dc.date.available 2006-06-09T18:03:32Z
dc.date.issued 2006-02-17 en_US
dc.description.abstract This study addresses the development of a sensor to monitor chemical adsorption and charge transfer processes on a surface using a contact potential difference probe (CPD). The current investigation is an outgrowth of ongoing research on non-vibrating CPD probes (nvCPD) which led to the recent development of a novel measurement technique utilizing optical stimulation: optically stimulated CPD (osCPD). Primary outcomes of this thesis are the theoretical modeling, fabrication and demonstration of a functional osCPD sensor. The research also involved significant engineering and experimentation in the design, development, and application of this sensor to oil condition monitoring. This technique measures dielectric and chemical properties of a fluid at the interface between the fluid and a semiconductor substrate. Chopped visible light is used to stimulate the rear surface of a semiconductor substrate, and a CPD probe measures the work function response of the semiconductor on the front surface of the substrate. The work function response is influenced by the nature and quantity of adsorbed species on the top surface, allowing the probe to detect changes in chemical composition at the substrate/fluid interface. An analytical model is developed that relates the osCPD sensor output signal to the chemical and dielectric properties of the oil sample, as well as to the geometry, composition, and control inputs of the silicon substrate and test fixture. In this investigation, the osCPD sensor was used to evaluate dielectric and chemical properties of commercially available engine oil. Oil samples were intentionally degraded through thermal aging (oxidation) and through addition of known contaminants. The osCPD sensor shows good sensitivity to depletion of antioxidants in the oil, as well as to the presence of ferric chloride, an oil-soluble salt typically used to calibrate laboratory test equipment. en_US
dc.description.degree Ph.D. en_US
dc.format.extent 3769530 bytes
dc.format.mimetype application/pdf
dc.identifier.uri http://hdl.handle.net/1853/10460
dc.language.iso en_US
dc.publisher Georgia Institute of Technology en_US
dc.subject Kelvin probe en_US
dc.subject.lcsh Volta effect en_US
dc.subject.lcsh Probes (Electronic instruments) Design and construction en_US
dc.title A Novel Sensor to Monitor Surface Charge Interactions: The Optically Stimulated Contact Potential Difference Probe en_US
dc.type Text
dc.type.genre Dissertation
dspace.entity.type Publication
local.contributor.advisor Danyluk, Steven
local.contributor.corporatename George W. Woodruff School of Mechanical Engineering
local.contributor.corporatename College of Engineering
relation.isAdvisorOfPublication 87cdff3a-1d95-4b3b-97f3-fa686905084b
relation.isOrgUnitOfPublication c01ff908-c25f-439b-bf10-a074ed886bb7
relation.isOrgUnitOfPublication 7c022d60-21d5-497c-b552-95e489a06569
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