Surface sol–gel growth of ultrathin SiO2 films on roughened Au electrodes: Extending borrowed SERS to a SERS inactive material

Wu, Qiao; Luo, Chunxiang; Yu, Huimin; Kong, Gezhi; Hu, Jiawen

doi:10.1016/j.cplett.2014.05.039

Cited by 10 publications

(7 citation statements)

References 39 publications

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“…Recent developments in the synthesis and fabrication of new colloid metal nanoparticles and solid support-based SERS substrates have led to the detection at trace levels of different compounds [5]. SERS metal substrates can be divided into two groups: i) colloid metal nanoparticles, and ii) roughened metallic surfaces [6]. The main limitation in using colloid metal nanoparticles is the formation of nanoparticle conglomerates after the addition of the sample, which often leads to poor reproducibility in the the SERS spectra [7].…”

Section: Introductionmentioning

confidence: 99%

Adsorption and Vibrational Study of Folic Acid on Gold Nanopillar Structures Using Surface-Enhanced Raman Scattering Spectroscopy

Castillo

Rindzevicius

Rozo

et al. 2015

Nanomaterials and Nanotechnology

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This paper presents a study of adsorption and vibrational features of folic acid, using surface-enhanced Raman scattering (SERS). A gold-capped silicon nanopillar (Au NP) with a height of 600 nm and a width of 120 nm was utilized to study the vibrational features of FA molecules adsorbed on the nanopillars within the high electromagnetic field areas. The adsorption behaviour of folic acid and the band assignment of the main vibrations together with the optimized geometry of folic acid and folic acid in the presence of a cluster of 10 gold atoms were assessed using the density functional theory (B3LYP(6-31G(d))) and the scalar relativistic effective core potential with a double-zeta basis set (LANL2DZ). The vibrations obtained from the solid-state folic acid and the folic acid on a gold cluster were in accordance with those observed experimentally. The analysis of the main vibrations indicated that the interaction of folic acid with the Au NP occurred primarily through the nitrogen atoms, from their pteridine ring. Finally, the obtained adsorption isotherm for folic acid was deduced from the analysis of the SERS spectra and it followed a negative cooperative binding model.

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Section: Introductionmentioning

confidence: 99%

Adsorption and Vibrational Study of Folic Acid on Gold Nanopillar Structures Using Surface-Enhanced Raman Scattering Spectroscopy

Castillo

Rindzevicius

Rozo

et al. 2015

Nanomaterials and Nanotechnology

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show abstract

“…Recent developments in the synthesis and fabrication of new colloid metal nanoparticles and solid support‐based SERS substrates have led to the detection at trace levels of different compounds . SERS substrates can be divided into two groups, (1) colloid metal nanoparticles and (2) roughened metallic surfaces . The main limitation in using colloid metal nanoparticles is the tendency for nanoparticle conglomeration after the addition of the analyte, which often leads to poor reproducibility of the SERS spectra .…”

Section: Introductionmentioning

confidence: 99%

Silver‐capped silicon nanopillar platforms for adsorption studies of folic acid using surface enhanced Raman spectroscopy and density functional theory

Castillo

Rindzevicius

et al. 2015

J Raman Spectroscopy

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The study of the interactions of folic acid (FA) with surface enhanced Raman scattering substrates is relevant for understanding its adsorption mechanism and for fabricating analytical devices for detection of malignant cells over‐expressing folate receptors. This paper presents a study of the adsorption of FA on silver‐capped silicon nanopillar substrates employing surface enhanced Raman scattering spectroscopy and density functional theory calculations. The experimentally observed vibrations from free FA and FA bound to the Ag surface display different vibrational spectra indicating chemical interaction of the molecule with the metal surface. Density functional theory calculations show that the Ag–FA interaction is primarily through the nitrogen from the pteridine ring anchoring to the Ag metal surface. To investigate the Ag–FA binding behavior further, the adsorption isotherm of FA on the silver‐capped silicon nanopillar surface is estimated. The results show a positive cooperative Ag–FA binding mechanism. That is, adsorbed FA increases the affinity of new incoming FA molecules. Copyright © 2015 John Wiley & Sons, Ltd.

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“…4 SERS substrates can be divided into two groups, (i) colloid metal nanoparticles 5 and (ii) roughened metallic surfaces. 6 The main limitation in using colloid metal nanoparticles is the tendency for nanoparticle conglomeration after the addition of the analyte which often leads to poor reproducibility of the SERS spectra. 7 An ideal SERS substrate must have sufficient Raman signal enhancement to be able to detect the analyte while, at the same time, having a homogenous surface able to produce reproducible Raman spectra.…”

Section: Introductionmentioning

confidence: 99%

Orientation of Pterin-6-Carboxylic Acid on Gold Capped Silicon Nanopillars Platforms: Surface Enhanced Raman Spectroscopy and Density Functional Theory Studies

Castillo¹,

Rozo²,

Bertel³

et al. 2015

Journal of the Brazilian Chemical Society

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The orientation of pterin-6-carboxylic acid on gold nanopillars was investigated by surface enhanced Raman spectroscopy and density functional theory methods. The experimentally vibrations from pterin-6-COOH free and attached to the Au surface display vibration features indicating chemical interaction of the pterin with the metal surface. The spectral feature evidenced that the pterin would adsorb on gold surface with a "lying down" configuration through the high intensity vibration of NH scissoring and rocking OH modes. The orientation study of pterins on gold nanopillars presented herein is believed to lead to new applications in biosensing field for detecting pterins of physiological importance.

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Surface sol–gel growth of ultrathin SiO2 films on roughened Au electrodes: Extending borrowed SERS to a SERS inactive material

Cited by 10 publications

References 39 publications

Adsorption and Vibrational Study of Folic Acid on Gold Nanopillar Structures Using Surface-Enhanced Raman Scattering Spectroscopy

Adsorption and Vibrational Study of Folic Acid on Gold Nanopillar Structures Using Surface-Enhanced Raman Scattering Spectroscopy

Silver‐capped silicon nanopillar platforms for adsorption studies of folic acid using surface enhanced Raman spectroscopy and density functional theory

Orientation of Pterin-6-Carboxylic Acid on Gold Capped Silicon Nanopillars Platforms: Surface Enhanced Raman Spectroscopy and Density Functional Theory Studies

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