Surface Enhanced Raman Spectra of 1,4-Benzenedimethanethiol on electrochemically (oxidation reduction cycle - step) fabricated nanoporous gold films

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Copyright: Copyright 2012, University of New South Wales
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Abstract
The oxidation reduction step technique was utilise and was optimised to fabricate as a Surface Enhanced Raman Spectroscopy (SERS) substrate at 785 nm by a central composite experimental design.
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http://hdl.handle.net/1959.4/004_369
DOI
https://doi.org/10.26190/unsworks/1403
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Publication Year
2013
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UNSW Faculty
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Surface Enhanced Raman Spectra of 1,4-Benzenedimethanethiol on electrochemically (single potential step) fabricated nanoporous gold films
Dataset
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.
Raman Spectra of Organo-arsenic compounds
Dataset
-organo-arsenic compounds were synthesized and purified by the Maher group from the University of Canberra-experimental Raman spectra (785 nm laser source) were acquired directly from solid materials-surface enhanced Raman spectra were acquired for organoarsenic samples with very low concentration, KlariteTM were used as SERS substrate Other related publications: Gloria D., Hibbert B., Moran G., Surface enhanced Raman Spectroscopy: SERS imaging of modified gold electrode for arsenic speciation. In Asia-Pacific Conference on Chemistry Education and 24th Philippine Chemistry Congress. Bohol, Philippines, 2009.Gloria D., Hibbert B., Moran G., Electrochemical Techniques for Fabricating Surface Enhanced Raman Spectroscopy Substrates. In The 16th Topics in Research and Development Meeting C.R., W. D. K. Y. a. M., Ed. Macquarie University, New South Wales, Australia: Macquarie University, New South Wales, Australia, 2008; ISBN 978-1-74138-313-3, p 27.Gloria D., Hibbert B., Moran G., Electrochemical Techniques for Fabricating Surface Enhanced Raman Spectroscopy Substrates. In RACI Electrochemistry Symposium: New Materials and New Methods in Electrochemistry, University of New South Wales, New South Wales, Australia, 2008; p 48.
Extinction Spectra of 1,4-Benzenedimethanethiol on Gold Nano Pillars with varying dimensions
Dataset
Through direct write electron beam lithography, periodic patterns with well-defined nano-roughness were fabricated reproducibly with varying pillar distance and size. Upon functionalization with 1, 4-benzenedimethanethiol, the optical reflectivity spectra of the surface were measured in the visible and near infrared at normal incidence using a custom built optical arrangement on Olympus BX 51 microscope (Photonics Lab UNSW School of Physics). In this set-up, a USB2000+ miniature fibre optic spectrometer (Ocean Optics Inc., USA), having a spectral resolution of 1 nm, was coupled to a multimode fibre with the collecting facet mounted in the conjugate image plane of the microscope. The microscope was equipped with a 20x objective. The collecting aperture of the fibre-coupled spectrometer had a diameter of 100 μm. Reflectivity spectra were recorded and processed using the SpectraSuite spectroscopy software platform (Ocean Optics Inc., USA).Below are information about the gold nano pillarsNo. Size/nm2 Distance/nm 1 (100) (100)2 (100) (300)3 (300) (100)4 (300) (300)5 (59) (200)6 (341) (200)7 (200) (59)8 (200) (341)9 (200) (200)10 (200) (200)
Surface Enhanced Raman Spectra of1,4-Benzenedimethanethiol on Gold Nano Pillars with varying dimensions
Dataset
Through direct write electron beam lithography, periodic patterns with well-defined nano-roughness were fabricated reproducibly with varying pillar distance and size. Upon functionalisation with 1, 4-benzenedimethanethiol, the SERS activity was investigated. Below are information about the gold nano pillarsNo. Size/nm2 Distance/nm 1 (100) (100)2 (100) (300)3 (300) (100)4 (300) (300)5 (59) (200)6 (341) (200)7 (200) (59)8 (200) (341)9 (200) (200)10 (200) (200)
DFT calculated Raman Spectra of Organo-arsenic compounds
Dataset
A Raman spectroscopic study of twelve relevant organo-arsenic compounds. We have considered the prediction of the normal mode vibrational frequencies and assignments based on calculations done at the HF, DFT/B3LYP levels of theory for 12 organo-arsenic compounds using 6-311++G(3df,3pd) basis set. The results from this high level of calculation, though not necessary, were corrected using established scale factors.
Related publication(s)
Related grant(s)
Surface enhanced Raman spectroscopy: Substrate fabrication and applications to arsenic speciation
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