Complex dielectric function and opto-electronic characterization using VEELS for the lead-free BCZT electro-ceramic perovskite

Herrera‐Pérez, G.; Ornelas, C.; Reyes-Montero, Armando; Paraguay‐Delgado, F.; Reyes‐Rojas, A.; Fuentes-Cobas, Luis E.

doi:10.1016/j.micron.2021.103124

Cited by 10 publications

(16 citation statements)

References 40 publications

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“…By and large, the 5-fold contribution of this work and the associated highlights are summarized as follows: donor-π−A architecture yielding a charge transfer emission at ∼700 nm. v. Futuristic scope and opportunities: From the fluorescence enhancements presented here, in the presence of BCZT NPs on both SPCE and PCCE platform (with and without GO layer), we conclude that BCZT NPs functions as a promising plasmonic material 32,33 by replacing the lossy metal NPs-based surface plasmonsensing platforms. BCZT NPs do not catalyze the breakdown of RhB or other dyes, and when doped with ions, they show dielectric enhanced fluorescence in cavity nanointerface configuration.…”

Section: Introductionmentioning

confidence: 73%

“…Figure 2a shows that the BCZT sample exhibits broad absorption below 400 nm due to the transition of the carriers from the valence band to the conduction band. 32 The band gap energy of the indirect transition between valence and conduction bands of the BCZT sample was calculated using the Tauc relation:…”

Section: Resultsmentioning

confidence: 99%

“…Thanks to Herrera-Peŕez and co-workers for the elucidation of the complex dielectric function of the BCZT NP (henceforth abbreviated as nano-BCZT) through valence electron energy loss spectroscopy, in transmission electron microscopy (VEELS−TEM), which assists in technically and theoretically comprehending its utility as a good plasmonic material. 32 Interestingly, nano-BCZT is reported to possess bulk plasmons and surface plasmons at ∼27 and ∼12 eV, respectively, with high real part of refractive index (n = 2.4) and negligible imaginary component. 32 Consequently, these properties make nano-BCZT an ideal ferroelectric material for plasmonic applications as it makes an avenue for successfully exciting the surface plasmon bands under appropriate conditions.…”

Section: Introductionmentioning

confidence: 99%

“…32 Interestingly, nano-BCZT is reported to possess bulk plasmons and surface plasmons at ∼27 and ∼12 eV, respectively, with high real part of refractive index (n = 2.4) and negligible imaginary component. 32 Consequently, these properties make nano-BCZT an ideal ferroelectric material for plasmonic applications as it makes an avenue for successfully exciting the surface plasmon bands under appropriate conditions. With this as a fundamental motivation, we explored the utility of nano-BCZT for enhancing the fluorescent signal of the molecules situated on metallic thin film (in SPCE) and on 1DPhC (in PCCE), and intriguing observations are documented.…”

Section: Introductionmentioning

confidence: 99%

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Plasmon-Rich BCZT Nanoparticles in the Photonic Crystal-Coupled Emission Platform for Cavity Hotspot-Driven Attomolar Sensing

Bhaskar,

Dahiwadkar

et al. 2023

ACS Appl. Nano Mater.

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The unique functionality of metallic and dielectric nanomaterials to generate intense electromagnetic field localization termed "hotspots" has been exploited in numerous luminescencebased biosensing applications. To obtain an amplified, sharply directional, and polarized emission, tunable size and shape morphologies have been evaluated in the surface plasmon-coupled emission (SPCE) platform. Although such studies have significantly facilitated the biosensor modalities, inevitable parasitic Ohmic losses in metal-dependent SPCE platforms have remained a significant bottleneck. In this context, recently, a dielectric-based photonic crystal-coupled emission (PCCE) platform is being explored for point-of-care diagnostics as it facilitates overcoming the limitations of conventional fluorescence and SPCE technologies. However, despite the utility of myriad metallo-dielectric hybrid nanoarchitectures and interfaces in SPCE and PCCE platforms to augment the photoplasmonic coupling efficiency, the expected fluorescence intensity remains compromised due to the presence of metallic components. In this background, we demonstrate the utility of high refractive index (HRI), ferroelectric, and biocompatible perovskite Ba 0.85 Ca 0.15 Zr 0.1 Ti 0.9 O 3 (BCZT) nanoparticles (NPs) for significantly augmenting the fluorescence of fluorophores. While nano-BCZT yielded 100-fold fluorescence enhancement in the lossy SPCE platform, >1000-fold enhancement is demonstrated in the lossless PCCE platform due to the generation of multifold nanocavities with copious hotspots. The localized density of states of radiating dipoles is maximized with effective coherent and collective photon coupling in a highly desirable nano-BCZT, graphene oxide, and one-dimensional photonic crystal ensemble. Consequently, this state-of-the-art ensemble presents an unaccustomed enhancement due to the judicious synergy of all-dielectric HRI NPs, π-plasmons, and internal optical modes which have been utilized for sensing a weakly fluorescent TPYP3 molecule at attomolar limit of detection. This all-dielectric-based PCCE platform opens up possibilities of using fluorophores with low quantum yield for sensing purposes. The sustainable nanoengineering technique developed here for photoplasmonic application opens opportunities for investigating such next-generation all-dielectric metasurfaces for point-of-care diagnostics and biosensing.

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Section: Introductionmentioning

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Plasmon-Rich BCZT Nanoparticles in the Photonic Crystal-Coupled Emission Platform for Cavity Hotspot-Driven Attomolar Sensing

Bhaskar,

Dahiwadkar

et al. 2023

ACS Appl. Nano Mater.

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show abstract

“…The energy range of ~10-30 eV is dominated by the plasmon peaks. More structures could be observed above 30 eV, and they are attributed to the elemental composition (threes vertical dashed lines) [3]. Panel (b) reveals the core loss EELS structure, identifying also the elemental analysis.…”

mentioning

confidence: 83%