Study of Silica Sol-Gel Materials for Sensor Development

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dc.contributor.advisorYip, Wai Tak
dc.creatorLei, Qiong
dc.date.accessioned2019-04-27T21:38:04Z
dc.date.available2019-04-27T21:38:04Z
dc.date.issued2010
dc.description.abstractAs a widely-explored subject for numerous applications, silica sol-gel has attracted
dc.description.abstractthe attention of our group for sensor development. This study focused on pore surface
dc.description.abstractmodification of two different types of silica sol-gel by post-grafting method, and
dc.description.abstractconstruction of stable silica hydrogel-like thin films. By monitoring the mobility and
dc.description.abstractphotostability of rhodamine 6G (R6G) molecules in silica alcogel thin films through
dc.description.abstractsingle molecule spectroscopy (SMS), the guest-host interactions altered by
dc.description.abstractpost-synthesis grafting were examined. Similar post-grafting method was then applied
dc.description.abstractto highly hydrated silica hydrogel monoliths; more efficient surface modification was
dc.description.abstractexpected, because larger pore sizes in hydrogel provide higher accessibility of
dc.description.abstractorganosilane reagents. During the study of post-grafting on alcogel thin film, a new
dc.description.abstractapproach to produce stable silica hydrogel-like thin films was discovered. A lot of effort
dc.description.abstracthas been made to improve the reproducibility of sample preparation, and the guest
dc.description.abstractloading capacity of silica hydrogel-like thin films. A prototype silica hydrogel-like thin
dc.description.abstractfilm pH sensor was also constructed and tested.
dc.description.abstract12
dc.description.abstractUnderstanding how guest-host interactions can be affected by silane modifications
dc.description.abstractis critical to sensor development. It helps tailoring the local environments inside silica
dc.description.abstractsol-gel matrix, so that higher guest loading, longer shelf-life, higher sensitivity and
dc.description.abstractfaster response of silica gel based sensors could be achieved. Stable silica hydrogel-like
dc.description.abstractthin film with a thickness only around 200 nm, which to the best of our knowledge has
dc.description.abstractnever been accomplished before, is expected to be a better substrate for sensing devices
dc.description.abstractthat demand faster response than thick monoliths
dc.format.extent208 pages
dc.format.mediumapplication.pdf
dc.identifier99364675802042
dc.identifier.urihttps://hdl.handle.net/11244/319217
dc.languageen_US
dc.relation.requiresAdobe Acrobat Reader
dc.subjectColloids
dc.subjectSilica gel
dc.subjectCeramic materials
dc.thesis.degreePh.D.
dc.titleStudy of Silica Sol-Gel Materials for Sensor Development
dc.typetext
dc.typedocument
ou.groupCollege of Arts and Sciences::Department of Chemistry and Biochemistry

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