Nanostructure effect on quenching and dequenching of quantum emitters on surface plasmon-coupled interface: A comparative analysis using gold nanospheres and nanostars

Bhaskar, S.; Patra, Ramay; Kowshik, N Charan S S; Ganesh, Kalathur Mohan; Srinivasan, Venkatesh; S, Prathap Chandran; Ramamurthy, Sai Sathish

doi:10.1016/j.physe.2020.114276

Cited by 42 publications

(80 citation statements)

References 43 publications

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“…It is instructive to discuss the importance of exploring AgAu nanohybrids in SPCE, prior to discussing the results obtained therefrom. As detailed in the preceding sections, on one hand, AuNPs quench the fluorescence and this has been a well-established limitation. ,,− On the other hand, AgNPs have been extensively explored in SPCE and other plasmonic technology developments such as SERS. However, achieving large SPCE enhancements with good control on chemical stability has been another enduring challenge with use of AgNPs .…”

Section: Results and Discussionmentioning

confidence: 99%

“…Unlike the large SPCE enhancements observed with the use of AgNPs, the enhancements with AuNPs are significantly less, as seen in Figure 4g. Earlier reports 27,28 highlight the quenching behavior of AuNPs, wherein ∼3−5-fold SPCE enhancements are observed with AuNPs, while blank without any NPs shows ∼10-fold enhancements. However, in line with the results obtained in the former section, the enhancements increase and becomes maximum for 30 min UV-exposed sample (140-fold), after which one can observe a further decline in SPCE enhancements.…”

Section: Soluplus Mediated Aunps: Spce Nanointerfacesmentioning

confidence: 92%

“…The SPCE enhancements are modified significantly depending on the properties of the dye molecules, NPs, and metallic thin film used. In our earlier reports, 11,27,28 it was noted that on account of admixing of dye and NPs, the surface induced quenching of the dye by NPs compete with plasmonic coupling, thereby resulting in dwindled enhancements. In view of that, we have developed an extended (ext.)…”

Section: Methodsmentioning

confidence: 98%

“…27 While this domain adopts metal-dielectric hybrid plasmonic resonances, another approach constitutes the applicability of a sharp-edged gold nanostar (AuNS) to surpass the quenching phenomenon. 28 Nevertheless, the SPCE enhancements has remained less than 200-fold, in the presence of AuNPs, in spite of all these modifications. This implies that a comprehensive and systematic revisit of the subject platform with respect to AuNPs is vital for obtaining augmented dequenched emission.…”

Section: Introductionmentioning

confidence: 99%

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Plasmon-Coupled Directional Emission from Soluplus-Mediated AgAu Nanoparticles for Attomolar Sensing Using a Smartphone

Rai

Bhaskar

Ramamurthy

2021

ACS Appl. Nano Mater.

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Although there are numerous techniques for the synthesis of plasmonic (metallic Ag and Au) nanomaterials, ecofriendly and biocompatible methodologies that present diverse applications in nanophotonics and biomedical domains are seldom reported. Soluplus is a graft copolymer of polyvinyl caprolactam− polyvinyl acetate−polyethylene glycol and is extensively used for improving the solubility and bioavailability of poorly water-soluble drugs. However, the utility of their amphiphilic chemical structure, strong UV-light absorbing, and bifunctional properties of the polymer matrix as well as its role as a solubilizer have not been explored for rapid synthesis of plasmonic bimetallic nanohybrids. Although a variety of nanoparticles (NPs) have been studied for surface plasmon-coupled emission (SPCE) spectroscopic applications, AgAu nanohybrids have not been examined in the subject platform hitherto. In this article, we demonstrate a synthesis route for obtaining AgNPs, AuNPs, and AgAu nanohybrids using soluplus as both the reducing and capping agent in a simple UV-light induced one-pot rapid technique. These hybrid nanomaterials were interfaced with propagating surface plasmon polaritons from a 50 nm Ag thin film to understand the plasmonic coupling phenomenon in spacer, cavity, and extended cavity nanoconfigurations. The obtained AgAu nanohybrids aided in addressing the three major long-standing challenges in SPCE technology development, namely, (i) unavoidable quenching in the presence of AuNPs, (ii) chemical instability in AgNPs, and (iii) intrinsic ohmic losses in plasmonic NPs. In addition to overcoming the above-mentioned caveats, unaccustomed >1200-fold sharply directional and polarized SPCE enhancements were achieved using AgAu nanohybrids. The multifold nanogaps generated in AgAu nanohybrid sustained multiple hotspots catering to attomolar sensitivity of the SPCE reporter molecule, rhodamine B (RhB). The proposed methodology to obtain dequenched as well as augmented SPCE enhancements is of utmost utility in biophysicochemical sensor development.

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Section: Results and Discussionmentioning

confidence: 99%

Section: Soluplus Mediated Aunps: Spce Nanointerfacesmentioning

confidence: 92%

Section: Methodsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Plasmon-Coupled Directional Emission from Soluplus-Mediated AgAu Nanoparticles for Attomolar Sensing Using a Smartphone

Rai

Bhaskar

Ramamurthy

2021

ACS Appl. Nano Mater.

Self Cite

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“…As important spectral technologies, fluorescence-based techniques have been widely used in all kinds of analysis and detection, but insufficient sensitivity limits their further development. − It has been shown that the radiation decay rate and the distribution of radiation energy of fluorophores can be changed when they are placed on a metal surface or a metal surface with nanostructures, which enables the increase of sensitivity. A new technique, namely, surface plasmon coupled emission (SPCE), in which directional and enhanced radiation is produced by the interaction between an excited fluorophore in the near-field (20–200 nm) of a continuous metallic surface and surface plasmons (SPs), − has been developed and demonstrated to be useful in biochemical detection − and imaging , due to its distance dependence and wavelength resolution.…”

mentioning

confidence: 99%

Amplified Fluorescence by Hollow-Porous Plasmonic Assembly: A New Observation and Its Application in Multiwavelength Simultaneous Detection

et al. 2021

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Surface plasmon coupled emission (SPCE) is a new analytical technique that provides increased and directional radiation based on the near-field interaction between fluorophores and surface plasmons but suffers from the limitation of insufficient sensitivity. The assembly of hollow-porous plasmonic nanoparticles could be the qualified candidate. After the introduction of gold nanocages (AuNCs), fluorescence signal enhancement was realized by factors over 150 and 600 compared with the normal SPCE and free space emission, respectively, with a fluorophore layer thickness of approximately 10 nm; hence, the unique enhancement of SPCE by the AuNCs effectively overcomes the signal quenching induced by resonance energy transfer (in normal SPCE). This enhancement was proven to be triggered by the superior wavelength match, the enhanced electromagnetic field, and new radiation channel and process induced by the AuNC assembly, which provides an opportunity to increase the detection sensitivity and establish an optimal plasmonic enhancement system. The amplified SPCE system was employed for multiwavelength simultaneous enhancement detection through the assembly of mixed hollow nanoparticles (AuNCs and gold nanoshells), which could broaden the application of SPCE in simultaneous sensing and imaging for multianalytes.

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Nanomaterials: Prospects for Water Purification and Relevance of Biosensing in Drinking Water

Bhaskar,

Ramamurthy

2024

Nanomaterials for Air‐ and Water Purification

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Nanostructure effect on quenching and dequenching of quantum emitters on surface plasmon-coupled interface: A comparative analysis using gold nanospheres and nanostars

Cited by 42 publications

References 43 publications

Plasmon-Coupled Directional Emission from Soluplus-Mediated AgAu Nanoparticles for Attomolar Sensing Using a Smartphone

Plasmon-Coupled Directional Emission from Soluplus-Mediated AgAu Nanoparticles for Attomolar Sensing Using a Smartphone

Amplified Fluorescence by Hollow-Porous Plasmonic Assembly: A New Observation and Its Application in Multiwavelength Simultaneous Detection

Nanomaterials: Prospects for Water Purification and Relevance of Biosensing in Drinking Water

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