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dc.contributor.authorJain, Ishanen_US
dc.date.accessioned2015-06-30T08:00:27Z
dc.date.available2015-06-30T08:00:27Z
dc.date.issued2015-06-29en_US
dc.identifier.othervt_gsexam:5333en_US
dc.identifier.urihttp://hdl.handle.net/10919/53946
dc.description.abstractSurface enhanced Raman spectroscopy (SERS) is highly promising analytical technique for trace detection of analytes. It is particularly well suited for environmental analyses due to its high sensitivity, specificity, ease of operation and rapidity. The detection and characterization of environmental contaminants, using SERS is highly related to the uniformity, activity and reproducibility of the SERS substrate. In this thesis, SERS substrates were produced by gold nanoparticle formation on wax patterned chromatography paper. In situ reduction of hydrogen tetrachloroaurate (gold precursor) by trisodium citrate dihydrate (reducing agent) was used to produce gold nanoparticles within a paper matrix. These gold nanoparticle based SERS substrates were analyzed by FE-SEM, UV-Vis and Raman spectroscopy. This work discusses the SERS signal enhancements for Raman active MGITC dye for a series of substrates prepared by in situ reduction of gold salt and pre-produced gold nanoparticles. UV-Vis analysis was performed to understand the effect of different molar ratio (reducing agent to gold precursor) and reaction time on the size and shape of the localized surface plasmon resonance (LSPR) band that dictates the SERS enhancements. It was concluded that lower molar ratio (1:1 and 2:1) of citrate-to gold produced better SERS signal enhancements and broader LSPR band. Therefore, use of lower molar ratio (MR) was recommended for paper-based substrates using in situ-based reduction approach.en_US
dc.format.mediumETDen_US
dc.publisherVirginia Techen_US
dc.rightsThis Item is protected by copyright and/or related rights. Some uses of this Item may be deemed fair and permitted by law even without permission from the rights holder(s), or the rights holder(s) may have licensed the work for use under certain conditions. For other uses you need to obtain permission from the rights holder(s).en_US
dc.subjectsurface enhanced Raman spectroscopyen_US
dc.subjectgold nanoparticlesen_US
dc.subjectpaper-based sensorsen_US
dc.subjectSERS substratesen_US
dc.subjectpathogen detectionen_US
dc.subjectµPadsen_US
dc.subjectmicrofluidic deviceen_US
dc.subjectsampling and monitoringen_US
dc.titlePaper-Based Sensors for Contaminant Detection Using Surface Enhanced Raman Spectroscopyen_US
dc.typeThesisen_US
dc.contributor.departmentCivil and Environmental Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineEnvironmental Engineeringen_US
dc.contributor.committeechairVikesland, Peter J.en_US
dc.contributor.committeememberPruden-Bagchi, Amy Jillen_US
dc.contributor.committeememberDavis, Richey M.en_US


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