Surface Enhanced Raman Spectra of 1,4-Benzenedimethanethiol on electrochemically (single potential step) fabricated nanoporous gold films

ac.person.orcid 0000-0001-9210-2941
ac.person.orcid 0000-0003-0869-0539
ac.person.position Staff
ac.person.position Staff
ac.person.position Staff
dc.contributor.other Hibbert, Brynn en_US
dc.contributor.other Moran, Grainne en_US 2021-11-26T10:33:59Z 2021-11-26T10:33:59Z 2013 en_US
dc.description.abstract The one-step electrochemicalfabrication of 3D-nano-porous goldfilms (NPGFs) was optimised to function as a Surface Enhanced Raman Spectroscopy (SERS) substrate at 785 nm by a central composite experimental design. The concentration of the acid electrolyte (HCl), the potential step time, and the interaction between the acid concentration and the step time all had significant influence on the SERS intensity. The substrate with an optimum SERS intensity of the 1610 cm - 1 band from 1,4-benzenedimethanethiol, which was self-assembled on the surface, was fabricated by applying 1.4 V (v Ag|AgCl|3.0 M NaCl) from open circuit potential for 50 s in 2.0 M HCl. The optimised 3D-NPGF substrates have highly uniform coverage of gold nanopores that leads to homogenous SERS intensities across 1000 μm2 of surface. en_US
dc.language English
dc.language.iso EN en_US
dc.title Surface Enhanced Raman Spectra of 1,4-Benzenedimethanethiol on electrochemically (single potential step) fabricated nanoporous gold films en_US
dc.type Dataset en_US
dcterms.accessRights metadata only access
dcterms.accrualMethod en_US
dcterms.rightsHolder Copyright 2012, University of New South Wales en_US
dspace.entity.type Dataset en_US
unsw.contributor.leadChiefInvestigator Gloria, Danmar en_US
unsw.contributor.researchDataCreator Gloria, Danmar en_US
unsw.coverage.temporalFrom 2010-03-05 en_US Please notify Primary Investigator for permission to access this data. en_US
unsw.description.storageplace UNSW Australia, Sydney NSW 2052, Australia en_US
unsw.isDatasetRelatingToDataset Raman Spectra of Organo-arsenic compounds
unsw.isDatasetRelatingToDataset Extinction Spectra of 1,4-Benzenedimethanethiol on Gold Nano Pillars with varying dimensions
unsw.isDatasetRelatingToDataset Surface Enhanced Raman Spectra of1,4-Benzenedimethanethiol on Gold Nano Pillars with varying dimensions
unsw.isDatasetRelatingToDataset DFT calculated Raman Spectra of Organo-arsenic compounds
unsw.isDatasetRelatingToDataset DFT calculated Infrared Spectra of Organoarsenics
unsw.isDatasetRelatingToDataset FTIR Spectra of Organoarsenic Compounds
unsw.isDatasetRelatingToDataset Competitive binding between 3-Mercaptopropionic acid and 1,4-Benzenedimethanethiol monitored through Surface Enhanced Raman Spectroscopy
unsw.isDatasetRelatingToDataset Surface Enhanced Raman Spectra of 1,4-Benzenedimethanethiol on electrochemically (oxidation reduction cycle) fabricated nanoporous gold films
unsw.isDatasetRelatingToDataset Effect of laser power and wavelength on SERS spectra of 1,4 Benzenedimethanethiol modified Klarite substrates
unsw.isDatasetRelatingToDataset Reductive Desorption of gold electrodes functionalised with MPA, MPYR, MBA, BDMT
unsw.isDatasetRelatingToDataset Surface Enhanced Raman Spectra of 1,4-Benzenedimethanethiol on electrochemically (oxidation reduction cycle - step) fabricated nanoporous gold films
unsw.relation.OriginalPublicationAffiliation Hibbert, Brynn, School of Chemistry, Faculty of Science, en_US
unsw.relation.OriginalPublicationAffiliation Moran, Grainne, D PVC Research Infrastruture, Research & Enterprise, en_US
unsw.relation.OriginalPublicationAffiliation Gloria, Danmar, Division of Human Resources, Operations Division, en_US
unsw.relation.faculty Science
unsw.relation.faculty Other UNSW
unsw.relation.projectDesc The toxicity of arsenic depends on its chemical form. Organo-arsenic compounds are acknowledged to be less toxic than inorganic arsenic compounds. Therefore, measurement of the concentration of arsenic as element (“total arsenic”) alone is insufficient because organo-arsenicals comprise an important fraction of many environmental samples. In this thesis several milestones on the path towards the development of a continuous and miniaturised arsenic speciation system based on surface enhanced Raman spectroscopy was achieved. The well known oxidation reduction cycle (ORC) technique for fabricating polycrystalline gold foils as effective surface enhanced Raman spectroscopy (SERS) substrates was systematically optimised using a central composite experimental design (CCD). A novel one step electrochemical method, which has been developed for fabrication of nano-porous gold films (NPGF), was demonstrated and optimised as an effective alternative to ORC. Direct-write electron beam lithography and metal-lift-off nanofabrication techniques were also used to create gold nano-pillar systems which serve as SERS substrates. The CCD optimisation model, built from the dimensions of the pillars and the distance between them predicts that higher Raman signal enhancements can be obtained using arrays with 185 nm spacing and 214 nm x 214 nm dimensions. A Raman spectroscopic study of twelve organo-arsenics was reported. The prediction of the normal mode vibrational frequencies and assignments were based on calculations done at the HF, DFT/B3LYP levels of theory using 6-311++G(3df,3pd) basis set. The first multivariate detection of the concentration of arsenic species using SERS was demonstrated. The adsorption of arsenic species on the surface has been aided by selecting the arsenic species according to their ionic charges. The species were partitioned into monolayers of charged alkanethiols. Multivariate regression of pure arsenic species over the concentration range of 0 – 5 mM was shown using a PLS1 algorithm. Simultaneous determination of arsenate and arsenobetaine has been demonstrated using a two sensor system. PLS2 was used for calibration of 16 samples containing all the possible combination of the chosen concentration range. The PLS2 model was applied to adequate amount of independent test sets and the actual concentration of the test sets agreed well with the predicted concentration. en_US
unsw.relation.projectEndDate 2011-12-31 en_US
unsw.relation.projectTitle Surface enhanced Raman spectroscopy: Substrate fabrication and applications to arsenic speciation en_US School of Chemistry Mark Wainwright Analytical Centre
unsw.subject.fieldofresearchcode 030101 Analytical Spectrometry en_US
unsw.subject.fieldofresearchcode 030199 Analytical Chemistry not elsewhere classified en_US
unsw.subject.fieldofresearchcode 100708 Nanomaterials en_US
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