Highly sensitive, stable g-CN decorated with AgNPs for SERS sensing of toluidine blue and catalytic reduction of crystal violet

Murugan, Eagambaram; Kumar, S. Santhosh; Reshna, K. M.; Govindaraju, S.

doi:10.1007/s10853-018-3184-5

Cited by 37 publications

(20 citation statements)

References 44 publications

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“…The SERS spectra of TB in the optoplasmonic structure are shown in Figure b,c. The spectral features of ring C–H bending modes at 446 and 499 cm –1 , the aliphatic C–H bending mode at 1390 cm –1 , and the ring skeletal mode at 1623 cm –1 were recognized in the measured spectra . As for the detection limit, the carboxyl-functionalized hybrid system (Figure b) demonstrates a minimum detection concentration of 1 nM, which is 1 order of magnitude higher than the one without functionalization (Figure c).…”

Section: Resultsmentioning

confidence: 90%

Optoplasmonic Hybrid Materials for Trace Detection of Methamphetamine in Biological Fluids through SERS

Yan

Zhou

Xu³

et al. 2020

ACS Appl. Mater. Interfaces

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Optoplasmonic materials comprising both photonic and plasmonic elements are of particular interest for the development of substrates for surface-enhanced Raman spectroscopy (SERS). In this work, a layer of analyte-carrying dielectric nano/microspheres is placed on top of a monolayer of gold nanoparticles to enhance the intensity of the electric (E-) field localization and to enrich the analyte close to the electromagnetic hot spots. Numerical simulations of the hybrid structure confirm an increased and spatially expanded E-field enhancement at the interface. Due to a decreasing filling fraction with increasing size of the dielectric spheres, simulations predict a saturated SERS enhancement for dielectric microspheres with a diameter larger than 4 μm, which is confirmed by experimental SERS measurements. The dielectric microsphere can be functionalized with surface ligands that facilitate the binding of target molecules in solution. The deposition of the analyte-loaded microspheres on the self-assembled gold nanoparticle ensures a high local concentration of analytes in the electromagnetic “hot” surface. The performance of the optoplasmonic SERS approach for detecting methamphetamine in saliva and urine is tested, and the detection of analytes at nanomolar (nM) concentrations is demonstrated.

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Section: Resultsmentioning

confidence: 90%

Optoplasmonic Hybrid Materials for Trace Detection of Methamphetamine in Biological Fluids through SERS

Yan

Zhou

Xu³

et al. 2020

ACS Appl. Mater. Interfaces

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“…This is because the free electron pair on the defect nitrogens cannot be delocalized, while the electron pair on the non‐defect nitrogens is delocalized. The partial positive charge formed on the nitrogen as a result of this delocalization generates high binding energy 49,50 . XPS scan of C1s spectra shows three binding energies representing carbon atoms in different functional groups.…”

Section: Resultsmentioning

confidence: 99%

“…The partial positive charge formed on the nitrogen as a result of this delocalization generates high binding energy. 49,50 XPS scan of C1s spectra shows three binding energies representing carbon atoms in different functional groups. These values can be listed as follows: aliphatic hydrocarbon (C H/C C, binding energy of 284.81-285.02 eV), ester or amide bond (C O/C N 286.21-286.67 eV, There has been some shift to the highenergy region due to intermolecular hydrogen bond interactions), carboxyl carbon ( COO, binding energy 288.66-289.01 eV).…”

Section: Xps Analysesmentioning

confidence: 99%

Synthesis of a new adsorbent poly(allylisothiocyanate‐co‐hydroxyethylmethacrylate‐co‐vinylimidazole) via photopolymerization: Characterization and investigation of heavy metal adsorption capacity

Saltan

2022

J of Applied Polymer Sci

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We report the copolymerization synthesis of novel poly(allylisothiocyanate‐co‐hydroxyethylmethacrylate‐co‐vinylimidazole) (PAHV) adsorbents for potential applications in the heavy metal removals. In the present study, the copolymerization reaction was introduced by photopolymerization using benzophenone as the photoinitiator. The chemical structure in the PAHV adsorbents was monitored and evaluated by Fourier transform infrared spectroscopy, 1H‐nuclear magnetic resonance, andX‐ray photoelectron spectroscopy measurements. Surface analysis and molecular weight distribution of PAHV adsorbents were performed by scanning electron microscopy and gel permeation chromatography analysis, respectively. The adsorption method, which is one of the most effective techniques, was used for the elimination of heavy metal ions from aqueous solutions in this study. In order to understand the adsorption capacity and removal efficiency of heavy metal ions by PAHV, the effects of pH value and monomer ratio in the adsorbents were investigated. Inductively coupled plasma mass spectrometry device was used for these analyses. The optimum pH values for adsorption capacity and removal efficiency of heavy metal ions have been 6–8. The removal efficiency of heavy metal ions by the various PAHV adsorbents decreased in the order: Cd2+ > Pb2+ > Co3+ > Cr3+ > Ni2+ > Cu2+.

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“…One way of overcoming such issues would be to convert the homogeneous system into heterogeneous. The immobilization of active metal complexes on the solid support increases the dispersion and enhances the accessibility of the active metal sites [15–17] . It is worth noting that prudent choice of solid support in a catalytic system is crucial for obtaining the optimum conversion, greater selectivity, and extensive reusability.…”

Section: Introductionmentioning

confidence: 99%

“…The immobilization of active metal complexes on the solid support increases the dispersion and enhances the accessibility of the active metal sites. [15][16][17] It is worth noting that prudent choice of solid support in a catalytic system is crucial for obtaining the optimum conversion, greater selectivity, and extensive reusability. In this context, zeolite, [18,19] silica, [20,21] polymer, [22][23][24][25] metal oxides, [26,27] and cellulosic [28,29] supports have been tested as catalytic systems.…”

Section: Introductionmentioning

confidence: 99%

Rh‐Complex Supported on Magnetic Nanoparticles as Catalysts for Hydroformylations and Transfer Hydrogenation Reactions

et al. 2022

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Herein, we describe a facile protocol for the phosphine complex of Rh anchored on the ultrasmall magnetic nanoparticles for transfer hydrogenation and hydroformylation reactions. A diphenylphosphino‐ferrocenylethyl amine was conjugated with dopamine hydrochloride to form dop‐Fc, which was then anchored on the surface of magnetic nanoparticles to produce Fe3O4@dop‐Fc. The prepared materials were complexed with a Rh precursor as a catalytic center. XRD, FTIR, SEM, TEM, and XPS were used to investigate the structure and its reactivity. Rh‐complexes of Fe3O4@dop‐Fc were used to convert terminal olefin to aldehyde using syngas (CO : H2 1 : 1) under pressure, obtaining up to 99% selectivity for branched aldehyde. The wide applicability of the Fe3O4@dop‐Fc−Rh construct was tested for the selective transfer hydrogenations of nitroarene and N‐heteroarene. Particularly, quinoline was quantitatively hydrogenated to 1,2,3,4‐tetrahydroquinoline(py‐THQ) using tetrahydroxydiboron (THDB). Also, the functional group tolerance in the reduction of nitroarene and styrene was evaluated. The robustness of the catalyst was tested by reusing it for multiple cycles.

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Highly sensitive, stable g-CN decorated with AgNPs for SERS sensing of toluidine blue and catalytic reduction of crystal violet

Cited by 37 publications

References 44 publications

Optoplasmonic Hybrid Materials for Trace Detection of Methamphetamine in Biological Fluids through SERS

Optoplasmonic Hybrid Materials for Trace Detection of Methamphetamine in Biological Fluids through SERS

Synthesis of a new adsorbent poly(allylisothiocyanate‐co‐hydroxyethylmethacrylate‐co‐vinylimidazole) via photopolymerization: Characterization and investigation of heavy metal adsorption capacity

Rh‐Complex Supported on Magnetic Nanoparticles as Catalysts for Hydroformylations and Transfer Hydrogenation Reactions

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