Femtosecond Laser-Nanostructured Substrates for Surface-Enhanced Raman Scattering

Diebold, Eric D.; Mack, Nathan H.; Doorn, Stephen K.; Mazur, Eric

doi:10.1021/la803357q

Cited by 139 publications

(142 citation statements)

References 31 publications

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“…We notice a similar quasi-uniform distribution of raised features as shown in the work by Diebold et al; 50 even in the presence of an additional transition metal.…”

Section: Enhancement Effects Of Bpe Using Mixed-metal Substratessupporting

confidence: 89%

Can Mixed-Metal Surfaces Provide an Additional Enhancement to SERS?

et al. 2012

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We explore the chemical contribution to surface-enhanced Raman scattering (SERS) in mixed-metal substrates, both experimentally and by computer simulation. These substrates are composed of a chemically active, transition-metal overlayer deposited on an effective SERS substrate. We report improved analytical enhancement factors obtained by using a small surface coverage of palladium or platinum over nanostructured silver substrates. Theoretical predictions of the chemical contribution to the surface enhancement using density functional theory support the experimental results. In addition, these approaches show that the increased enhancement is due not only to an increase in surface coverage of the analyte but also to a higher Raman scattering cross section per molecule. The additional chemical enhancement in mixed-metal SERS substrates correlates with the binding energy of the analyte on the surface and includes both static and dynamical effects. SERS using mixed-metal substrates has the potential to improve sensing for a large group of analyte molecules and to aid the development of chemically specific SERS-based sensors.

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“…We notice a similar quasi-uniform distribution of raised features as shown in the work by Diebold et al; 50 even in the presence of an additional transition metal.…”

Section: Enhancement Effects Of Bpe Using Mixed-metal Substratessupporting

confidence: 89%

Can Mixed-Metal Surfaces Provide an Additional Enhancement to SERS?

et al. 2012

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“…This results in the amplification of the Raman signal on average by more than a million times as compared to the conventional setup of Raman spectroscopy. 10,11 In addition, the response from the molecules is modified --vibrational peaks are shifted and relative intensities are changed. The latter effects is associated with the adsorption of the molecules on the metal surface.…”

Section: Introductionmentioning

confidence: 99%

Increase of SERS Signal upon Heating or Exposure to a High-Intensity Laser Field: Benzenethiol on an AgFON Substrate

2012

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The surface-enhanced Raman scattering (SERS) signal from an AgFON plasmonic substrate, recoated with benzenethiol, was observed to increase by about 100% upon heating for 3.5 min at 100 °C and 1.5 min at 125 °C. The signal intensity was found to increase further by about 80% upon a 10 s exposure to a high-intensity (3.2 kW/cm2) 785 nm CW laser, corresponding to 40 mW in a 40 ± 5 μm diameter spot. The observed increase in the SERS signal may be understood by considering the presence of benzenethiol molecules in an intermediate or “precursor” state in addition to conventionally ordered molecules forming a self-assembled monolayer. The increase in the SERS signal arises from the conversion of the molecules in the precursor state to the chemisorbed state due to thermal and photothermal effects.

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“…For sil− ver, the nanoparticle patterning by the pulsed−laser abla− tion of a silver target and deposition on a glass surface both performed in water is reported and then found to be a highly effective surface−enhanced Raman scattering sub− strate [8,9]. Recently, the femtosecond laser nanostruc− turing of SERS substrates on silicon basis has been reported [10].…”

Section: Introductionmentioning

confidence: 99%

Nanostructuring of thin Au films by means of short UV laser pulses

Grochowska

Nedyalkov

Atanasov

et al. 2011

Opto-Electronics Review

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The particle size distribution, morphology and optical properties of the Au nanoparticle (NP) structures for surface enhanced Raman signal (SERS) application are investigated in dependence on their preparation conditions. The structures are produced from relatively thin Au films (10–20 nm) sputtered on fused silica glass substrate and irradiated with several pulses (6 ns) of laser radiation at 266 nm and at fluencies in the range of 160–412 mJ/cm2. The SEM inspection reveals nearly homogeneously distributed, spherical gold particles. Their initial size distribution of the range of 20–60 nm broadens towards larger particle diameters with prolonged irradiation. This is accompanied by an increase in the uncovered surface of the glass substrate and no particle removal is observed. In the absorption profiles of the nanostructures, the broad peak centred at 546 nm is ascribed to resonant absorption of surface plasmons (SPR). The peak position, halfwidth and intensity depend on the shape, size and size distribution of the nanostructured particles in agreement with literature. From peak intensities of the Raman spectra recorded for Rhodamine 6G in the range of 300–1800 cm−1, the relative signal enhancement by factor between 20 and 603 for individual peaks is estimated. The results confirm that the obtained structures can be applied for SERS measurements and sensing.

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Femtosecond Laser-Nanostructured Substrates for Surface-Enhanced Raman Scattering

Cited by 139 publications

References 31 publications

Can Mixed-Metal Surfaces Provide an Additional Enhancement to SERS?

Can Mixed-Metal Surfaces Provide an Additional Enhancement to SERS?

Increase of SERS Signal upon Heating or Exposure to a High-Intensity Laser Field: Benzenethiol on an AgFON Substrate

Nanostructuring of thin Au films by means of short UV laser pulses

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