Surface enhanced Raman spectroscopy of organic molecules deposited on gold sputtered substrates

Merlen, Alexandre; Gadenne, Virginie; Romann, Julien; Chevallier, Virginie; Patrone, Lionel; Valmalette, Jean‐Christophe

doi:10.1088/0957-4484/20/21/215705

Cited by 78 publications

(74 citation statements)

References 26 publications

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“…This peculiar activity is strongly related to their size and shape dependent surface charge oscillation known as surface plasmon resonance (SPR) in presence of light irradiation [65,66]. Here, the electrons in TiO 2 are excited from the VB to the CB by UV light irradiation.…”

Section: Photo-catalytic Hydrogen Evolution From Plasmonic Active Phomentioning

confidence: 99%

Graphene supported plasmonic photocatalyst for hydrogen evolution in photocatalytic water splitting

et al. 2014

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It is well known that the noble metal nanoparticles show active absorption in the visible region because of the existence of the unique feature known as surface plasmon resonance (SPR). Here we report the effect of plasmonic Au nanoparticles on the enhancement of the renewable hydrogen (H2) evolution through photocatalytic water splitting. The plasmonic Au/graphene/TiO2 photocatalyst was synthesized in two steps: first the graphene/TiO2 nanocomposites were developed by the hydrothermal decomposition process; then the Au was loaded by photodeposition. The plasmonic Au and the graphene as co-catalyst effectively prolong the recombination of the photogenerated charges. This plasmonic photocatalyst displayed enhanced photocatalytic H2 evolution for water splitting in the presence of methanol as a sacrificial reagent. The H2 evolution rate from the Au/graphene co-catalyst was about 9 times higher than that of a pure graphene catalyst. The optimal graphene content was found to be 1.0 wt %, giving a H2 evolution of 1.34 mmol (i.e., 26 μmolh−1), which exceeded the value of 0.56 mmol (i.e., 112 μmolh−1) observed in pure TiO2. This high photocatalytic H2 evolution activity results from the deposition of TiO2 on graphene sheets, which act as an electron acceptors to efficiently separate the photogenerated charge carriers. However, the Au loading enhanced the H2 evolution dramatically and achieved a maximum value of 12 mmol (i.e., 2.4 mmolh−1) with optimal loading of 2.0 wt% Au on graphene/TiO2 composites. The enhancement of H2 evolution in the presence of Au results from the SPR effect induced by visible light irradiation, which boosts the energy intensity of the trapped electron as well as active sites for photocatalytic activity.

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Section: Photo-catalytic Hydrogen Evolution From Plasmonic Active Phomentioning

confidence: 99%

Graphene supported plasmonic photocatalyst for hydrogen evolution in photocatalytic water splitting

et al. 2014

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“…Therefore, heat dissipation from a highly energetic source such as the Raman excitation laser is limited and causes locally very high temperatures. 4,229,[239][240][241] Furthermore, when the surface features are smaller than the wavelength of the illuminating light, as is the case in our samples (Figure 6.7), oscillating plasmons start to play a signal enhancing role.…”

Section: 236supporting

confidence: 57%

Microspectroscopic characterisation of gold nanorods for cancer detection

Hartsuiker

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“…In Figure 7, we report the SERS spectra acquired on Ag and Au samples soaked in aqueous solutions of R6G, at the lowest concentrations we tested. The corresponding laser excitations were 632.8 nm for Ag and 785 nm for Au to achieve the maximum EF by matching the corresponding SPR absorption peak positions, observed near 550 and 800 nm, respectively [20,21]. We believe that the detection at such a low concentration level is due to the formation of hot spots, whose number density strictly depends on film surface morphology, in turn controlled by an easily accessible deposition parameter, i.e., the laser pulse number (see Figure 2.).…”

Section: Sers Activity Of Pulsed Laser Ablated Silver and Gold Substrmentioning

confidence: 65%

Laser Controlled Synthesis of Noble Metal Nanoparticle Arrays for Low Concentration Molecule Recognition

et al. 2014

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Nanostructured gold and silver thin films were grown by pulsed laser deposition. Performing the process in an ambient gas (Ar) leads to the nucleation and growth of nanoparticles in the ablation plasma and their self-organization on the substrate. The dependence of surface nanostructuring of the films on the deposition parameters is discussed considering in particular the number of laser pulses and the ambient gas nature and pressure. The performance of the deposited thin films as substrates for surface-enhanced Raman spectroscopy (SERS) was tested against the detection of molecules at a low concentration. Taking Raman maps on micrometer-sized areas, the spatial homogeneity of the substrates with respect to the SERS signal was tested.

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Surface enhanced Raman spectroscopy of organic molecules deposited on gold sputtered substrates

Cited by 78 publications

References 26 publications

Graphene supported plasmonic photocatalyst for hydrogen evolution in photocatalytic water splitting

Graphene supported plasmonic photocatalyst for hydrogen evolution in photocatalytic water splitting

Microspectroscopic characterisation of gold nanorods for cancer detection

Laser Controlled Synthesis of Noble Metal Nanoparticle Arrays for Low Concentration Molecule Recognition

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