Combining interferometric sensors for dual parameter fiber optic chemical sensing

Muri, Harald Ian; Hammarling, Krister; Wahl, Markus Solberg; Engholm, Magnus; Hjelme, Dag Roar

doi:10.1364/ofs.2018.wf80

Cited by 1 publication

(1 citation statement)

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“…For an ensemble of nanoparticles experimenting dipolar interactions, however, Mie's solutions fail and, in general, effective medium theories are more suitable to predict the plasmonic behavior, although they provide good estimates at the cost of cumbersome calculations . Muri and Hjelme developed a simpler estimation of the effect of aggregation of Au NPs on λ SPR upon correcting the resonance condition, while taking geometric features of the system (nanoparticles’ radius, r , and nanoparticles’ center‐to‐center distance, d ) into account. According to their approach, the resonance condition for an ensemble of plasmonic nanoparticles undergoing dipole–dipole interactions is given by Equation

ε_{1} (ω) = - 2 ε_{normalm} (ω) [1 + 3 {3extrue(\frac{r}{d} 3extrue)}^{3}]

…”

Section: Resultsmentioning

confidence: 99%

The Role Played by Graphene Oxide in the Photodeposition and Surface‐Enhanced Raman Scattering Activity of Plasmonic Ag Nanoparticle Substrates

Costa

Maciel

Sales

et al. 2020

Physica Status Solidi (a)

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Layer‐by‐layer photocatalyst films made of TiO2 nanoparticles (TiO2NP) assembled with both poly(sodium 4‐styrenesulfonate) (PSS) and graphene oxide (GO) are used for the photodeposition of plasmonic Ag nanoparticles (AgNPs) and subsequently used in surface‐enhanced Raman scattering (SERS). Both photocatalyst films, TiO2NP/PSS and TiO2NP/GO, are capable of driving the formation of AgNP when they are wetted with a drop of AgNO3 diluted solution and submitted to UV irradiation (254 nm). The photodeposition of AgNP, as monitored by UV–vis spectroscopy, follows a first‐order kinetics process in both films and is slightly faster in the TiO2NP/PSS. In addition, scanning electron microscopy reveals that in the TiO2NP/PSS film, the photodeposited AgNPs are larger and isolated, whereas in the TiO2NP/GO film, they are smaller and highly interconnected. The SERS activity of the substrates is evaluated with rhodamine B. When samples are excited in resonance with rhodamine B absorption (514 nm), GO‐based substrates provide the largest enhancement because GO is able to quench the rhodamine B fluorescence, something that PSS is unable to do. Out of this condition (633 nm), the plasmonic effect of AgNP alone prevails regardless of the presence of GO.

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ε_{1} (ω) = - 2 ε_{normalm} (ω) [1 + 3 {3extrue(\frac{r}{d} 3extrue)}^{3}]

…”

Section: Resultsmentioning

confidence: 99%

The Role Played by Graphene Oxide in the Photodeposition and Surface‐Enhanced Raman Scattering Activity of Plasmonic Ag Nanoparticle Substrates

Costa

Maciel

Sales

et al. 2020

Physica Status Solidi (a)

View full text Add to dashboard Cite

show abstract

Combining interferometric sensors for dual parameter fiber optic chemical sensing

Abstract: Long and short path length differences interferometric sensing modalities have been combined based on immobilizing hydrogel on thin-core optical fiber end face. Dual parameter sensing of hydrogel swelling and refractive index was demonstrated.

Cited by 1 publication

References 7 publications

The Role Played by Graphene Oxide in the Photodeposition and Surface‐Enhanced Raman Scattering Activity of Plasmonic Ag Nanoparticle Substrates

The Role Played by Graphene Oxide in the Photodeposition and Surface‐Enhanced Raman Scattering Activity of Plasmonic Ag Nanoparticle Substrates

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