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dc.rights.licenseRestricted to current Rensselaer faculty, staff and students. Access inquiries may be directed to the Rensselaer Libraries.
dc.contributorLian, Jie
dc.contributorBorca-Tasçiuc, Theodorian
dc.contributorBorca-Tasçiuc, Diana-Andra
dc.contributorHuang, Liping
dc.contributor.authorSun, Hongtao
dc.date.accessioned2021-11-03T08:18:54Z
dc.date.available2021-11-03T08:18:54Z
dc.date.created2015-03-09T11:52:32Z
dc.date.issued2014-12
dc.identifier.urihttps://hdl.handle.net/20.500.13015/1327
dc.descriptionDecember 2014
dc.descriptionSchool of Engineering
dc.description.abstractTargeting the developments of advanced nano-scale thermal sensors with a fast time response and rapid readout, this thesis reports innovative designs of high surface-to-volume ratio gold nanostructures including ultrathin gold island films on transparent quartz substrates and silica-gold core-shell (SiO2@Au) nanospheres as potential dynamic thermal sensors for accurate temperature determination. The sensing mechanism is based on strong temperature dependences of the thermally-dewetting-induced morphological self-reorganization and characteristic surface plasmon (SP) absorption of the gold nanostructures. The irreversible thermally-induced morphological and optical signatures behave as characteristic "fingerprints" for temperature recording, allowing the retrieval of thermal history ex-situ. The fundamental studies of thermal-induced dewetting process and its corresponding unique optical properties were extensively investigated by high resolution scanning electron microscopy (HR-SEM), atomic force microscopy (AFM), and UV-vis-NIR spectroscopy, which illustrate temperature and time dependent variations. As compared with current nanothermometer technologies such as metal-filled nanotubes, our thermo-sensor offers positively synergistic advantages of ultrafast time response, permanent recording and fast readout of thermal history, and ex-situ capability for effective temperature measurements.
dc.description.abstractNano-scale temperature measurements are of significance for fundamental understanding of functional applications and nanosystems, requiring ultimate miniaturization of thermometers with reduced size, maintained sensitivity, simplicity and accuracy of temperature reading. Particularly, grand challenges exist for scenarios of combustion or thermal shock where materials may be subjected to drastic temperature variations and extreme thermal flux, and dynamic thermal sensors with an ultrafast response (seconds to milliseconds) are yet to be developed.
dc.description.abstractIn addition, SiO2@Au nanospheres display simultaneously enhanced near bandgap edge (NBE) emissions and suppress defect level emission (DLE) of poly(vinyl alcohol) (PVA) zinc oxide nanoparticles (ZnO NPs), significantly improving the UV emission of the ZnO. Maximum emission enhancement by nearly 4 times was observed using SiO2@Au nanospheres with SP band at 554 nm. The enhanced UV emission is ascribed to the transfer of the energetic electrons excited by SP from gold nanoshells to the conduction band of ZnO. As a result of their superior tunability of surface plasmon resonance (SPR), the SiO2@Au core/shell nanospheres may be very useful in tuning the photoluminescence for a wide range of optoelectronic applications.
dc.language.isoENG
dc.publisherRensselaer Polytechnic Institute, Troy, NY
dc.relation.ispartofRensselaer Theses and Dissertations Online Collection
dc.subjectMechanical engineering
dc.titleGold-based nanostructures for ultrafast dynamic nanothermometer
dc.typeElectronic thesis
dc.typeThesis
dc.digitool.pid174855
dc.digitool.pid174858
dc.digitool.pid174861
dc.rights.holderThis electronic version is a licensed copy owned by Rensselaer Polytechnic Institute, Troy, NY. Copyright of original work retained by author.
dc.description.degreePhD
dc.relation.departmentDept. of Mechanical, Aerospace, and Nuclear Engineering


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