Surface-enhanced Raman scattering (SERS) spectra of three kinds of azo-dye molecules on silver nanoparticles prepared by electrolysis

Min-zhen, SI; Kang, Yipu; Liu, R.M.

doi:10.1016/j.apsusc.2011.12.118

Cited by 30 publications

(17 citation statements)

References 14 publications

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“…The SER spectra collected on solid‐state (powder) methyl red (Fig. , pattern ‘b’) are virtually consistent with previously published SER data . SERS spectra in aqueous solutions of the different dye isomers ( ortho ‐, meta ‐ and para ‐) at variable pH values were collected by Lee et al .…”

Section: Resultssupporting

confidence: 86%

“…Conventional Raman spectra collected on solid methyl red (powder) (Fig. , pattern ‘a’) using the 633‐nm laser are mostly comparable – both per positions and intensities of the bands – with literature data . Though the assignments may vary according to the different literature sources, all observed modes can unequivocally be related to the neutral form of the dye (MR).…”

Section: Resultsmentioning

confidence: 64%

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FT‐Raman and surface‐enhanced Raman scattering (SERS) spectroscopic study of a methyl red@palygorskite hybrid nanocomposite: isomerization and protonation of the guest dye

Giustetto

Idone

Diana

2016

J Raman Spectroscopy

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An extremely stable hybrid composite, useable as a pigment in the Cultural Heritage and Materials Science fields, can be obtained by grinding and heating 2 wt% methyl red with palygorskite, a fibrous microporous clay mineral. Dye molecules are incorporated within the clay nanotunnels and/or superficial grooves, partly sheltered from the external environment and forming specific host–guest interactions that stabilize the composite. The molecular structure and surrounding interactions of the encapsulated methyl red molecules were studied by means of Fourier transform (FT) and surface‐enhanced Raman (SER) Spectroscopies – useful techniques to analyze adsorbates even at very low concentrations. Comparison between Fourier transform and SER spectra of the pristine dye and the hybrid composite shows that methyl red exists, after encapsulation in palygorskite, in its neutral (azo) and protonated (hydrazo) forms, both with planar morphology. Incorporation in the host framework favours significant transformation of the guest dye molecule from the azo to the hydrazo species, consistently with the composite synthesis being performed in acidic environment. The incidental addition of plasmonic substrates, used in SER spectra to enhance the Raman signal, further accentuates this conversion. Diffusion in the clay nanotunnels is expected to cause moderate ring deformations/distortions in the methyl red molecule, as reflected by the perturbation of selected Raman modes. The details about the specific orientations and interactions of the dye with the Ag colloid are discussed, as well as their effects on the Raman signal enhancement. Although a feasible quantification of their mutual amounts is impracticable, because of the too many variables involved, presence of several dye species in the host framework, each contributing to the nanocomposite colour, qualifies the studied complex as a polyfunctional organic/inorganic hybrid composite. Copyright © 2016 John Wiley & Sons, Ltd.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 64%

FT‐Raman and surface‐enhanced Raman scattering (SERS) spectroscopic study of a methyl red@palygorskite hybrid nanocomposite: isomerization and protonation of the guest dye

Giustetto

Idone

Diana

2016

J Raman Spectroscopy

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“…Owing to their intrinsic important features, AgNPs decorated on graphene surface could increase SERS activity, electrocatalytically active surface area, and stability, making them excellent in sensoring areas . It has been reported that the applications of Ag–graphene based nanocomposites in chemical and biological sensoring are ultra‐sensitive, time‐saving, and cost‐effective . In this section, we mainly highlighted the detection performance of various Ag–graphene based nanocomposites as well as influence factors on the detection.…”

Section: Sensorsmentioning

confidence: 99%

Advancement of Ag–Graphene Based Nanocomposites: An Overview of Synthesis and Its Applications

Zeng

Chen

et al. 2018

Small

124

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Graphene has been employed as an excellent support for metal nanomaterials because of its unique structural and physicochemical properties. Silver nanoparticles (AgNPs) with exceptional properties have received considerable attention in various fields; however, particle aggregation limits its application. Therefore, the combination of AgNPs and graphene based nanocomposites (Ag-graphene based nanocomposites) has been widely explored to improve their properties and applications. Excitingly, enhanced antimicrobial, catalytic, and surface enhanced Raman scattering properties are obtained after their combination. In order to have a comprehensive knowledge of these nanocomposites, this Review highlights the chemical and biological synthesis of Ag-graphene nanocomposites. In particular, their applications as antimicrobial agents, catalysts, and sensors in biomedicine, agricultural protection, and environmental remediation and detection are covered. Meanwhile, the factors that influence the synthesis and applications are also briefly discussed. Furthermore, several important issues on the challenges and new directions are also provided for further development of these nanocomposites.

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“…Nanogoldbased sensors were also reported to be used in the triplexed detection of leukaemia and lymphoma cells in a flow cytometry setting [37] and have potential for in vitro diagnostics of pathogens and cancer agents [38].…”

Section: Figurementioning

confidence: 99%

Mycofabrication of common plasmonic colloids, theoretical considerations, mechanism and potential applications

Madden

Naughton

Moane

et al. 2015

Advances in Colloid and Interface Science

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Surface-enhanced Raman scattering (SERS) spectra of three kinds of azo-dye molecules on silver nanoparticles prepared by electrolysis

Cited by 30 publications

References 14 publications

FT‐Raman and surface‐enhanced Raman scattering (SERS) spectroscopic study of a methyl red@palygorskite hybrid nanocomposite: isomerization and protonation of the guest dye

FT‐Raman and surface‐enhanced Raman scattering (SERS) spectroscopic study of a methyl red@palygorskite hybrid nanocomposite: isomerization and protonation of the guest dye

Advancement of Ag–Graphene Based Nanocomposites: An Overview of Synthesis and Its Applications

Mycofabrication of common plasmonic colloids, theoretical considerations, mechanism and potential applications

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