Surface-enhanced Raman scattering properties of multi-walled carbon nanotubes arrays-Ag nanoparticles

Zhou, Jie; Zhang, Xiaolei; Chen, Simeng; Gong, Tiancheng; Zhu, Yudan

doi:10.1016/j.carbon.2016.01.025

Cited by 56 publications

(32 citation statements)

References 68 publications

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Section: Resultsmentioning

confidence: 99%

“…Hot spot were observed in between the gap of the Ag dimer and the maximum local electric field enhancement found to be 72.4 V/m. Theoretically, electromagnetic enhancement factor can be written as em G SERS = [ E local ] 4 /[ E incident ] 4 where E local and E incident are the localized and incident electric fields, respectively . The value of em G SERS approaches to 2.7 × 10 7 for the maximum E local = 72.4 V/m.…”

Section: Resultsmentioning

confidence: 99%

“…Theoretically, electromagnetic enhancement factor can be written as em G SERS = [E local ] 4 /[E incident ] 4 where E local and E incident are the localized and incident electric fields, respectively. [3,53] The value of em G SERS approaches to 2.7 × 10 7 for the maximum E local = 72.4 V/m. The em G SERS value indicates that not only EM enhancement plays an important role but also some contribution (~10 2 ) of CE gives such large experimental G SERS value (10 9 ).…”

Section: Sulfide-mediated Polyol Methodsmentioning

confidence: 95%

“…It is well known from thermal evaporation technique that increase in the evaporation flux leads to the increase in the size and decrease in the coverage of the grown nanoparticles. [53][54][55] Based on the SEM and UV-Vis absorption results of Ag nanoparticles grown at different growth cycles, we propose the growth mechanism. For growth cycles studies, we kept the concentrations of the precursors, adsorption, reduction, and rinsing times fixed therefore the number of the grown Ag nuclei after each growth cycle supposed to be constant.…”

Section: Effect Of Growth Cyclesmentioning

confidence: 99%

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SILAR grown Ag nanoparticles as an efficient large area SERS substrate

Shaikh

Sartale

2018

J Raman Spectroscopy

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Ag nanoparticles having different size and coverage are grown on large area glass substrate (~10 cm2) using low cost successive ionic layer adsorption and reduction (SILAR) method. The SILAR parameters, such as reduction time and growth cycles are optimized to grow Ag nanoparticles with appropriate size and coverage showing maximum surface enhanced Raman scattering (SERS) enhancement of Rhodamine 6 G(R6G). For fixed growth cycles, the size and the coverage of the grown Ag nanoparticles are found to increase with the reduction time and then saturate. The size and coverage of the grown Ag nanoparticles monotonically increase with growth cycles. However, for higher growth cycles, the shape of Ag nanoparticles could not maintain their sphericity and became rock shaped/nonspherical particles, giving rise to intense quadruple plasmon resonance. The growth mechanism is proposed. Further, SERS activity of the grown Ag nanoparticles is studied for an industrial pollutant methylene blue (MB). The observed SERS enhancement factor (~109) for MB is much higher than the reported values in literature. Measured relative standard deviations values of Ag nanoparticles grown with optimum SILAR parameters suggest the excellent homogeneity and reproducibility of the SERS signal.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Sulfide-mediated Polyol Methodsmentioning

confidence: 95%

Section: Effect Of Growth Cyclesmentioning

confidence: 99%

See 2 more Smart Citations

SILAR grown Ag nanoparticles as an efficient large area SERS substrate

Shaikh

Sartale

2018

J Raman Spectroscopy

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“…This indicates again that the present adopted method conserves the overall integrity of the MWCNTs as well as improves their quality. This is one of the advantages of the present work over other methods which suffer from material quality problems (disorder in the carbon wall) after the modification of CNTs with nanoparticles [49,50].…”

Section: Raman Characterization Of Materialsmentioning

confidence: 87%

Differently substituted aniline functionalized MWCNTs to anchor oxides of Bi and Ni nanoparticles

et al. 2019

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We have studied the consequence of different functionalization types onto the decoration of multi-wall carbon nanotubes (MWCNTs) surface by nanoparticles of bismuth and nickel oxides. Three organic molecules were considered for the functionalization: 5-amino-1,2,3-benzenetricarboxylic acid, 4-aminobenzylphosphonic acid and sulfanilic acid. Nanotubes modification with in situ created diazonium salts followed by their impregnation with suitable salts [ammonium bismuth citrate and nickel (II) nitrate hexahydrate] utilizing infrared (IR) irradiation was found the crucial stage in the homogeneous impregnation of functionalized CNTs. Furthermore, calcination of these samples in argon environment gave rise to controlled decorated MWCNTs. The currently used technique is simple as well as effective. The synthesized materials were characterized by XPS, PXRD, FESEM, EDX, HRTEM and Raman spectroscopy. Bismuth oxide decorations were successfully performed using 5-amino-1,2,3-benzenetricarboxylic acid (particle size ranges from 1 to 10 nm with mean diameter ~ 2.4 nm) and 4-aminobenzylphosphonic acid (particle size ranges from 1 to 6 nm with mean diameter ~ 1.9 nm) functionalized MWCNTs. However, only 4-aminobenzylphosphonic acid functionalized MWCNTs showed strong affinity towards oxides of nickel nanoparticles (mainly in hydroxide form, particles size ranging from 1 to 6 nm with mean diameter ~ 2.3 nm). Thus, various functions arranged in the order of their increasing anchoring capacities are as follows: sulfonic < carboxylic < phosphonic. The method is valid for large-scale preparations. These advanced nanocomposites are potential candidates for various applications in nanotechnology.

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