Tunable Surface-enhanced Raman Scattering (SERS) from nano-aperture arrays

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dc.contributor.author Zhang, Xiaoqiang
dc.date.accessioned 2012-04-30T22:31:01Z
dc.date.available 2012-04-30T22:31:01Z
dc.date.copyright 2012 en_US
dc.date.issued 2012-04-30
dc.identifier.uri http://hdl.handle.net/1828/3959
dc.description.abstract Research work on fabricating organized and reproducible SERS substrates has been done in this thesis. Nano-aperture arrays with circular, bow-tie and cross bow-tie shapes were fabricated by using FIB milling. These arrays were imaged under SEM and their parameters were measured. The optical transmission properties of these arrays were measured by white light transmission. It was found that the shape of the nano-aperture could determine these arrays’ abilities to support SPR. Different shapes would give different SPR modes and generated optical transmission peaks at varied wavelengths. For nano-aperture array with identical shapes, the varied parameters, such as periodicity or tip-to-tip distances, would affect the position of the transmission peaks. Slight increase or decrease of these parameters can be manipulated to adjust the peak positions, catering to the best resonance of the excitation laser used in Raman spectroscopy. The enhancement properties of these arrays as SERS substrates were measured by Raman spectroscopy. Different SERS enhancement properties could be found across different shaped nano-aperture arrays and cross bow-tie nano-aperture arrays give the best SERS enhancement. For nano-aperture array with identical shapes, the varied parameters would affect its ability of SERS enhancement. Near field simulations were carried out in order to explain the relationship of the SERS results and these arrays’ SPR ability. Electrochemical study on these ordered nano-aperture arrays was also carried out in this thesis. en_US
dc.language English eng
dc.language.iso en en_US
dc.subject SERS en_US
dc.subject nano-aperture en_US
dc.subject arrays en_US
dc.title Tunable Surface-enhanced Raman Scattering (SERS) from nano-aperture arrays en_US
dc.type Thesis en_US
dc.contributor.supervisor Brolo, Alexandre Guimaraes
dc.degree.department Dept. of Chemistry en_US
dc.degree.level Master of Science M.Sc. en_US
dc.rights.temp Available to the World Wide Web en_US
dc.description.scholarlevel Graduate en_US

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