Surface-enhanced Raman scattering from small numbers of purified and oxidised single-walled carbon nanotubes

Al-Attar, Nebras; Kopf, Ilona; Kennedy, Eamonn; Flavin, Kevin; Giordani, Silvia; Rice, James H.

doi:10.1016/j.cplett.2012.03.092

Cited by 30 publications

(19 citation statements)

References 27 publications

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“…Plasmon active arrays possessing regularly positioned plasmon active sites provide a geometry design that supports a homogenous signal enhancement across a large sample surface area. Modern nanofabrication methodologies enable the creation of a number of different nanostructures with precisely controlled shapes, sizes, and spacing [3][4][5][6][7][8][9][10]. This has extended to the creation of a range of different metallic nanostructures array designs that produce localized surface plasmon resonances (LSPRs) [8][9][10][11][12][13][14][15].…”

Section: Papermentioning

confidence: 99%

Plasmon enhanced fluorescence studies from aligned gold nanorod arrays modified with SiO2 spacer layers

Damm

Fedele

Murphy

et al. 2015

Applied Physics Letters

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Here, we demonstrate that quasi self-standing Au nanorod arrays prepared with plasma polymerisation deposited SiO2 dielectric spacers support surface enhanced fluorescence (SEF) while maintaining high signal reproducibility. We show that it is possible to find a balance between enhanced radiative and non-radiative decay rates at which the fluorescent intensity is maximized. The SEF signal optimised with a 30 nm spacer layer thickness showed a 3.5-fold enhancement with a signal variance of <15% thereby keeping the integrity of the nanorod array. We also demonstrate the decreased importance of obtaining resonance conditions when localized surface plasmon resonance is positioned within the spectral region of Au interband transitions. Procedures for further increasing the SEF enhancement factor are also discussed.

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Section: Papermentioning

confidence: 99%

Plasmon enhanced fluorescence studies from aligned gold nanorod arrays modified with SiO2 spacer layers

Damm

Fedele

Murphy

et al. 2015

Applied Physics Letters

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“…[1][2][3][4][5][6][7][8] When LSPs are formed, strongly enhanced electromagnetic near-fields are generated at the surface of the supporting nanostructure. This property has attracted considerable research interest due to its potential applications in sensors, photonic circuits and medical diagnostics and therapeutics.…”

Section: Introductionmentioning

confidence: 99%

Application of AAO Matrix in Aligned Gold Nanorod Array Substrates for Surface-Enhanced Fluorescence and Raman Scattering

et al. 2014

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In this paper we probe surface enhanced Raman scattering (SERS) and Surface enhanced Fluorescence (SEF) from probe molecule Rhodamine 6G (Rhod6G) on self-standing Au nanorod array substrates made using a combination of anodization and potentiostatic electrodeposition. The finished substrates were embedded within a porous alumina template. By varying the etching time i.e. the thickness of the alumina, we show that there exists an inverse relationship between SERS and SEF. SERS and SEF also show a nonlinear response to increasing etching time due to an inhomogeneous plasmon activity across the nanorod. By modeling the electromagnetic fields created at different etching times we confirm the nonuniform plasmon activity along the Au nanorods and explain the nonlinear behaviors of SERS and SEF. Optimization of the level of alumina matrix thickness optimizes conditions for obtaining either maximized SERS, SEF or for simultaneously observing both SERS and SEF together.

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“…Raman and fluorescence measurements were performed at ambient temperature using a custom-built, open-bench Raman system in epi-fluorescence backscattering configuration with 532, 473 and 633 nm excitation [22][23][24][25] with the laser focused to a spot size of c.a. 10 μm.…”

Section: Papermentioning

confidence: 99%

“…The spectrum shows also a Q-band (S 1 exciton state) region with a strong peak at 675 nm. The redistribution of B and Q intensities following aggregation been attributed to intensity transfer from the B-to the Q-band region that is mediated by an excitonic coupling between B and Q transition dipoles.Raman and fluorescence measurements were performed at ambient temperature using a custom-built, open-bench Raman system in epi-fluorescence backscattering configuration with 532, 473 and 633 nm excitation [22][23][24][25] with the laser focused to a spot size of c.a. 10 μm.…”

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confidence: 99%

Strong coupling in molecular exciton-plasmon Au nanorod array systems

et al. 2016

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We demonstrate here strong coupling between localized surface plasmon modes in self-standing nanorods with excitons in a molecular J-aggregate layer though angular tuning. The enhanced exciton−plasmon coupling creates a Fano like line shape in the differential reflection spectra associated with the formation of hybrid states, leading to anti-crossing of the upper and lower polaritons with a Rabi frequency of 125 meV. The recreation of a Fano like line shape was found in photoluminescence demonstrating changes in the emission spectral profile under strong coupling. PaperDevelopments in top-down and bottom-up nanofabrication techniques have enabled the development of active plasmonic nanomaterials such as arrays of gold nanorods with size-and shape-tunable plasmonic resonances [1][2][3][4]. Active plasmonics nanomaterials can be coupled with excitonic systems to give rise to hybrid plasmon-exciton modes (Plexcitons) when in the strong coupling regime [5][6][7][8]. Such systems when within the strong coupling limit effect changes in the optical processes of an emitter or absorber excitonic system. This offers potential to enhance or control exciton processes in excitonic systems such as organic semiconductors which offers opportunities for enhanced photonic device designs such as in light harvesting, optical sensing or artificial light sources [1,9,10]. An understanding of light mater interactions of plasmon-exciton complexes is central in fully realizing the potential of such complexes.A number of studies have demonstrated plasmon-exciton in the strong coupling limit between an organic exciton semiconductor and a surface plasmons [11,12] and localized surface plasmons geometries [13][14][15][16][17]. Studies have demonstrated that colloidal Au nanoshell-J-aggregate particles exhibit strong coupling between the localized plasmons of a nanoshell and the excitons of molecular J-aggregates adsorbed on its surface [13]. The interaction of an organic exciton in a J-aggregate and surface plasmon polariton modes of nanostructured hole arrays or of nanosize metallic disks with different array periods was reported to exhibit strong coupling [14][15][16]. Tuning of plasmon-exciton coupling strength has been reported for strongly coupled exciton-plasmon states in Au nanodisk arrays coated with J-aggregate molecules achieved by changing the incident angle of incoming light, rather than changing the geometry 2 of the plasmonic nanomaterial. Using such an angle resolved approach plasmon-exciton coupling of variable strengths was achieved [17].Strong coupling between plasmons on oriented gold nanorods arrays and J-aggregate molecular exciton has been demonstrated using a series of arrays with different architectures to control the spatial and spectral overlap between the plasmonic structure and exciton molecular aggregates [18]. Here we demonstrate tuning/detuning of strong coupling in self-standing nanorod arrays achieved though angular tuning. We report a Fano line shape in the differential reflection spectra associated...

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Surface-enhanced Raman scattering from small numbers of purified and oxidised single-walled carbon nanotubes

Cited by 30 publications

References 27 publications

Plasmon enhanced fluorescence studies from aligned gold nanorod arrays modified with SiO2 spacer layers

Plasmon enhanced fluorescence studies from aligned gold nanorod arrays modified with SiO2 spacer layers

Application of AAO Matrix in Aligned Gold Nanorod Array Substrates for Surface-Enhanced Fluorescence and Raman Scattering

Strong coupling in molecular exciton-plasmon Au nanorod array systems

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