Nanostructured and nanopatterned gold surfaces: application to the surface-enhanced Raman spectroscopy

Bouvrée, Audrey; D’Orlando, Angélina; Makiabadi, Tahereh; Martin, Sharon J. H.; Louarn, G.; Mevellec, Jean‐Yves; Humbert, Bernard

doi:10.1007/s13404-013-0127-4

Cited by 16 publications

(10 citation statements)

References 36 publications

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“…Smythe et al built a SERS optrode by fabricating a nanoantenna array on a planar substrate using electron beam lithography and then transferring it to the fiber tip [ 24 ]. Bouvrée et al used a multi-step process based upon e-beam lithography to create regular patterns (concentric rings or lines) on the optical fiber tip where gold nanoparticles are then immobilized [ 25 ]. Andrade et al designed and fabricated SERS surfaces composed of both circular and bow tie-shaped gold nanohole arrays by using the direct FIB milling of a gold layer deposited on the single mode fiber tip [ 26 ].…”

Section: Introductionmentioning

confidence: 99%

Nanosphere Lithography on Fiber: Towards Engineered Lab-On-Fiber SERS Optrodes

Quero

Zito

Managò

et al. 2018

Sensors

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In this paper we report on the engineering of repeatable surface enhanced Raman scattering (SERS) optical fiber sensor devices (optrodes), as realized through nanosphere lithography. The Lab-on-Fiber SERS optrode consists of polystyrene nanospheres in a close-packed arrays configuration covered by a thin film of gold on the optical fiber tip. The SERS surfaces were fabricated by using a nanosphere lithography approach that is already demonstrated as able to produce highly repeatable patterns on the fiber tip. In order to engineer and optimize the SERS probes, we first evaluated and compared the SERS performances in terms of Enhancement Factor (EF) pertaining to different patterns with different nanosphere diameters and gold thicknesses. To this aim, the EF of SERS surfaces with a pitch of 500, 750 and 1000 nm, and gold films of 20, 30 and 40 nm have been retrieved, adopting the SERS signal of a monolayer of biphenyl-4-thiol (BPT) as a reliable benchmark. The analysis allowed us to identify of the most promising SERS platform: for the samples with nanospheres diameter of 500 nm and gold thickness of 30 nm, we measured values of EF of 4 × 105, which is comparable with state-of-the-art SERS EF achievable with highly performing colloidal gold nanoparticles. The reproducibility of the SERS enhancement was thoroughly evaluated. In particular, the SERS intensity revealed intra-sample (i.e., between different spatial regions of a selected substrate) and inter-sample (i.e., between regions of different substrates) repeatability, with a relative standard deviation lower than 9 and 15%, respectively. Finally, in order to determine the most suitable optical fiber probe, in terms of excitation/collection efficiency and Raman background, we selected several commercially available optical fibers and tested them with a BPT solution used as benchmark. A fiber probe with a pure silica core of 200 µm diameter and high numerical aperture (i.e., 0.5) was found to be the most promising fiber platform, providing the best trade-off between high excitation/collection efficiency and low background. This work, thus, poses the basis for realizing reproducible and engineered Lab-on-Fiber SERS optrodes for in-situ trace detection directed toward highly advanced in vivo sensing.

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Section: Introductionmentioning

confidence: 99%

Nanosphere Lithography on Fiber: Towards Engineered Lab-On-Fiber SERS Optrodes

Quero

Zito

Managò

et al. 2018

Sensors

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“…1 They can be used as catalysts, sensors, biosensors, and substrates for surface-enhanced Raman spectroscopy (SERS). [2][3][4][5] Au thin films on glass also have the potential to be used as transparent conductive electrodes (TCEs) in solar cells, and infrared reflective coatings for architectural windows. 6,7 Different applications require different properties of the Au thin films.…”

Section: Introductionmentioning

confidence: 99%

Preparation of Electrically Conductive Au Thin Films by Colloid Sedimentation

Petek

Bukovec

Škofic

2015

ACSi

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Dedicated to the memory of Prof. Dr. Jurij V. Bren~i~. AbstractA novel and facile wet-chemical method for the preparation of Au thin films is presented. The Au thin films were deposited on glass substrates by the gravitational sedimentation of Au colloids. The colloids were formed by chemical reduction in ethanol using HAuCl 4 and NaBH 4 with no added surfactants. Without stabilizing agents the colloids quickly aggregated, settled to the bottom and formed a thin film. The sedimentation of the colloids was monitored using UV-vis spectroscopy. Thin films with Au loads ranging between 0.25 and 4.0 g m -2 were prepared and characterized by means of UV-vis spectroscopy, electrical resistance measurements, optical microscopy, scanning electron microscopy, and cyclic voltammetry. The results showed that nanostructured Au films with a very high specific surface area were formed. The films were electrically conductive and partially transparent to visible light.

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“…Numerous studies have concerned their structural and optical properties (for a recent review, see Kossov et al 131415 and thus their application as surface-enhanced Raman scattering (SERS) substrates16.…”

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confidence: 99%

Vibrational density of states and thermodynamics at the nanoscale: the 3D-2D transition in gold nanostructures

Carles

Benzo

Pécassou

et al. 2016

Sci Rep

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Surface enhanced Raman scattering (SERS) is generally and widely used to enhance the vibrational fingerprint of molecules located at the vicinity of noble metal nanoparticles. In this work, SERS is originally used to enhance the own vibrational density of states (VDOS) of nude and isolated gold nanoparticles. This offers the opportunity of analyzing finite size effects on the lattice dynamics which remains unattainable with conventional techniques based on neutron or x-ray inelastic scattering. By reducing the size down to few nanometers, the role of surface atoms versus volume atoms become dominant, and the “text-book” 3D-2D transition on the dynamical behavior is experimentally emphasized. “Anomalies” that have been predicted by a large panel of simulations at the atomic scale, are really observed, like the enhancement of the VDOS at low frequencies or the occurrence of localized modes at frequencies beyond the cut-off in bulk. Consequences on the thermodynamic properties at the nanoscale, like the reduction of the Debye temperature or the excess of the specific heat, have been evaluated. Finally the high sensitivity of reminiscent bulk-like phonons on the arrangements at the atomic scale is used to access the morphology and internal disorder of the nanoparticles.

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Nanostructured and nanopatterned gold surfaces: application to the surface-enhanced Raman spectroscopy

Cited by 16 publications

References 36 publications

Nanosphere Lithography on Fiber: Towards Engineered Lab-On-Fiber SERS Optrodes

Nanosphere Lithography on Fiber: Towards Engineered Lab-On-Fiber SERS Optrodes

Preparation of Electrically Conductive Au Thin Films by Colloid Sedimentation

Vibrational density of states and thermodynamics at the nanoscale: the 3D-2D transition in gold nanostructures

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