Plasmon-Enhanced Fluorescence and Spectral Modification in SHINEF

Aroca, Ricardo F.; Teo, Geok Yi; Mohan, Haider; Guerrero, Ariel R.; Albella, Pablo; Moreno, Fernando

doi:10.1021/jp205997u

Cited by 57 publications

(62 citation statements)

References 22 publications

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“…We argue theoretically and demonstrate experimentally that under SEF conditions the plasmon resonances affect not only the fluorescence intensity (enhancement or quenching) but also its spectral profile, sometimes to a point where the original fluorescence spectrum may no longer be recognizable as such". Our own experiments using SHINEF also confirm the SPM effect in the observed enhanced fluorescence [57]. It simply means that the re-emission by the enhancing nanostructure may change the shape of the molecular fluorescence [57] producing a modified band shape, as can be seen in Fig.…”

Section: Tuning the Plasmon Extinction And The Molecular Emissionsupporting

confidence: 74%

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Plasmonics and Ultrasensitive Detection

Aroca

2015

Nanomaterials and Nanoarchitectures

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An approach for experimental design in plasmon-enhanced spectroscopy is discussed based on its basic elements: electromagnetic radiation, adsorbed molecule and the metal nanostructure. Optimization of the plasmon enhancement may be achieved by tuning the electromagnetic radiation to take advantage of resonances with molecules and nanostructures. For instance, when the excitation is in resonance with a molecular electronic transition, resonance Raman scattering is observed providing a very efficient scattering with cross section for vibrational transitions several orders of magnitude higher than normal Raman. Tuning the excitation of the nanostructure might depend on the degree of aggregation, or the properties of two and three dimensional array of fabricated nanostructures. Several examples of surface enhanced Raman scattering (SERS), SERS and surface enhanced fluorescence using shell isolated nanoparticles are presented. The experimental results illustrate the remarkable optical properties of metal nanoparticles which are governed by the excitation of localized surface plasmon resonances producing local enhancement of the electromagnetic field. However, each experiment is unique and requires a selection of the setting for each one of the three elements that would lead to the most efficient plasmon enhancement.

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Section: Tuning the Plasmon Extinction And The Molecular Emissionsupporting

confidence: 74%

“…Our own experiments using SHINEF also confirm the SPM effect in the observed enhanced fluorescence [57]. It simply means that the re-emission by the enhancing nanostructure may change the shape of the molecular fluorescence [57] producing a modified band shape, as can be seen in Fig. 2.15.…”

Section: Tuning the Plasmon Extinction And The Molecular Emissionsupporting

confidence: 71%

Plasmonics and Ultrasensitive Detection

Aroca

2015

Nanomaterials and Nanoarchitectures

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“…The increase in the intensity is related to the existence of a "cradle of hot-spots" resulting from the synthesis of the shell-isolated nanoparticles (Fig. 1B), described by Aroca et al 36 as aggregated nanoparticles. From the SHINERS data it is then possible an additional enhancement of the SERS weak modes (Table 3).…”

Section: The Shiners Spectrummentioning

confidence: 78%

Raman and Surface Enhanced Raman Signals of the Sensor 1-(4-Mercaptophenyl)-2,4,6-Triphenylpyridinium Perchlorate

Célis

Campos‐Vallette

Vega

et al. 2015

J. Chil. Chem. Soc.

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The sensor 1-(4-mercaptophenyl)-2,4,6-triphenylpyridinium perchlorate compound was vibrationally characterized using Raman and the Surface-Enhanced Raman techniques, SERS and Shell-Isolated Nanoparticles-Enhanced Raman Spectroscopy (SHINERS). The Raman spectrum was analyzed and the band assignment was supported using DFT data at the B3LYP/6-31G(d) level. SERS data allowed infer about the orientation of the analyte on the naked Ag surface. EHT calculations for an Ag/analyte model represent well the SERS spectrum supporting the Ag-S bond formation. The SHINERS spectrum was obtained by using Ag@SiO 2 nanoparticles prepared at two different time of the SiO 2 coating process. The most intense SHINERS spectral signals of the compound (100 nM) were obtained after 20 minutes of the Ag@SiO 2 formation. No charge-transfer was concluded from the SHINERS experiments.

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“…20 The simplest model for aggregation is that of the Au-SHIN dimer illuminated at normal incidence and polarized along the dimer axis as shown in Figure 5a. In Figure 5, we show the far field and near field response of a gold SHIN dimer embedded in water.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Plasmon Enhanced Fluorescence with Aggregated Shell-Isolated Nanoparticles

et al. 2014

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Shell-isolated nanoparticles (SHINs) nanostructures provide a versatile substrate where the localized surface plasmon resonances (LSPRs) are well-defined. For SHINEF, the silver (or gold) metal core is protected by the SiO2 coating, which is thicker than the critical distance for minimum quenching by the metal. In the present work, it is shown that an increase in the SHINEF enhancement factor may be achieved by inducing SHIN aggregation with electrolytes in solution. The proof of concept is demonstrated using NaCl as aggregating agent, although other inorganic salts will also aggregate SHIN nanoparticles. As much as a 10-fold enhancement in the SHINEF enhancement factor (EF) may be achieved by tuning the electrolyte concentrations in solution. The SHINEF experiments include the study of the aggregation effect controlling gold SHIN's surface concentration via spraying. Au-SHINs are sprayed onto layer-by-layer (LbL) and Langmuir-Blodgett (LB) films, and samples are fabricated using fluorophores with low and also high quantum yield.

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Plasmon-Enhanced Fluorescence and Spectral Modification in SHINEF

Cited by 57 publications

References 22 publications

Plasmonics and Ultrasensitive Detection

Plasmonics and Ultrasensitive Detection

Raman and Surface Enhanced Raman Signals of the Sensor 1-(4-Mercaptophenyl)-2,4,6-Triphenylpyridinium Perchlorate

Plasmon Enhanced Fluorescence with Aggregated Shell-Isolated Nanoparticles

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