Hybrid ZnO:polystyrene nanocomposite for all‐polymer photonic crystals

Lova, Paola; Manfredi, Giovanni; Boarino, Luca; Laus, Michele; Urbinati, Giulia; Losco, Tonia; Marabelli, F.; Caratto, Valentina; Ferretti, M.; Castellano, Maila; Soci, Cesare; Comoretto, Davide

doi:10.1002/pssc.201400209

Cited by 31 publications

(31 citation statements)

References 52 publications

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“…The effect of such roughness appears, however, comparable to that observed in the metal oxide nanoparticle multilayers that are successfully applied to a variety of fields, including sensing, [62] switchers, [44] and photon control in photovoltaics [6] (aside from lasing and light emission control [58,[63][64][65]). On the other hand, polymer systems possess mechanical properties such as a level of flexibility that is inconceivable within inorganic structures [21,35,36,66].…”

Section: Methodsmentioning

confidence: 99%

Solution Processed Polymer-ABX4 Perovskite-Like Microcavities

et al. 2019

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Thanks to solution processability and broad emission in the visible spectral range, 2D hybrid perovskite-like materials are interesting for the realization of large area and flexible lighting devices. However, the deposition of these materials requires broad-spectrum solvents that can easily dissolve most of the commercial polymers and make perovskites incompatible with flexible photonics. Here, we demonstrated the integration of broadband-emitting (EDBE)PbCl4 (where EDBE = 2,2-(ethylenedioxy)bis(ethylammonium)) thin films with a solution-processed polymer planar microcavities, employing a sacrificial polymer multilayer. This approach allowed for spectral and angular redistribution of the perovskite-like material, photoluminescence, that can pave the way to all-solution-processed and flexible lightning devices that do not require complex and costly fabrication techniques.

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Section: Methodsmentioning

confidence: 99%

Solution Processed Polymer-ABX4 Perovskite-Like Microcavities

et al. 2019

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“…The light source was a combined deuterium–halogen lamp model Micropak DH2000BAL. Collection angle resolved photoluminescence (PL) spectra are excited by a 405 nm CW laser (Oxxius S.A. LBX‐405‐100‐CSB‐PP model) . Steady state PL spectra of HBPVS have been also measured by using a Perkin Elmer MPF‐44A spectrofluorimeter with excitation at 300 nm.…”

Section: Methodsmentioning

confidence: 99%

“…By considering photonic crystal structures solely composed of polymer films, the main growth techniques usually adopted are based on block‐copolymers self‐assembly, coextrusion, and spin coating, even though expensive and time consuming ones like holographic lithography, or plasma vapor deposition (a technique suitable for radical polymerization only) are also used. Among them, spin coating allows for a fast and simple preparation of one‐dimensional (1D) planar PhC structures such as Distributed Bragg Reflectors (DBR, multilayers of two alternated materials) and microcavities (for an extended review on this topics, see ref.…”

Section: Introductionmentioning

confidence: 99%

High refractive index hyperbranched polyvinylsulfides for planar one‐dimensional all‐polymer photonic crystals

Gazzo

Manfredi

Pötzsch

et al. 2015

J Polym Sci B Polym Phys

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We report on the growth and characterization of onedimensional\ud (1D) planar all-polymer photonic crystals (PhC) with\ud high dielectric contrast (Dn50.3) prepared by spin coating using\ud hyperbranched polyvinylsulfide polymers (HB-PVS) as high\ud refractive index material and cellulose acetate as low refractive\ud index material. Solution processable HB-PVS show a near ultraviolet\ud absorption inducing an increased refractive index in the\ud visible-near infrared (n51.68, k51000 nm). HBPVS:Cellulose\ud Acetate Distributed Bragg Reflectors show a very clear fingerprint\ud of the photonic band gap possessing the expected polarized\ud dispersion properties as a function of the incidence angle.\ud Moreover, engineered microcavities tuned on the weak fluorescence\ud spectrum of the HB-PVS show directional fluorescence\ud enhancement effects due to spectral redistribution of the emission\ud oscillator strength. The combination of all these properties\ud testifies the high optical quality of the obtained photonic structures\ud thus indicating HB-PVS as an interesting material for the\ud preparation of such PhC. V

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“…When the FHPS is placed in air polluted with a volatile molecular compound, the molecules permeate into its structure, and progressively swell the PS, the CA or both the layers, depending on . [7][8][9] The interaction between the polymer and the analyte results in a variation of the thickness and refractive index of the layers, and thus, of the light optical path (Figure 1a). In turn, such variation affects the PBG spectral position, according to…”

Section: Working Principle Of Fhpssmentioning

confidence: 99%

Flory–Huggins Photonic Sensors for the Optical Assessment of Molecular Diffusion Coefficients in Polymers

Lova

Manfredi

Bastianini

et al. 2019

ACS Appl. Mater. Interfaces

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The lack of cost-effective systems for the extensive assessment of air pollutants is a concern for health and safety in urban and industrial areas. The use of polymer thin films as labelfree colorimetric sensors featuring specific interactions with pollutants would then represent a paradigm shift in environmental monitoring and packaging technologies, allowing to assess air quality, formation of byproducts in closed environment, and the barrier properties of the polymer themselves. To this end, all-polymer distributed Bragg reflectors promises reliable transducers for chemical stimuli, and effective colorimetric label-free selective detectors. We show selectivity attained by specific interaction of the polymeric components with the analytes. Such interactions drive the analyte intercalation trough the polymer structure and its kinetics, converting it in a dynamic optical response which is at the basis of the Flory-Huggins photonic sensors. Additionally, we demonstrate that such optical response can be used to esteem the diffusion coefficients of small molecules within the polymer media via simple UV-Vis spectroscopy retrieving data comparable to those obtained with state of the art gravimetric procedures. These results pave the way to an innovative, simple, and lowcost detection method integrable to in-situ assessment of barrier polymers used for the encapsulation of optoelectronic devices, food packaging, and goods storage in general. Currently, barrier properties of polymer thin films to vapors and gas are assessed via gravimetric 1 and pressure decay methods, 2-4 or by optical techniques based on microscopy 5 and infrared absorption, 6 which remained substantially unchanged for the last few decades. These methods need dedicated equipment and cannot be performed in-situ. In this scenario, research for new low-cost, simpler, and portable technologies to gather lab-on-chip devices is strongly pursued. In these regards, sensors based on the optical response of polymer distributed Bragg reflectors (DBR) represent a possible revolution in the field due to the high responsivity to analytes in the vapor phase. 7-9 DBRs are planar photonic crystals made of media with different refractive index stacked to form a dielectric lattice. The interaction between light and DBRs induces frequency regions where light propagation is forbidden. These frequencies are called photonic band gaps (PBGs), and are easily detectable via simple reflectance or transmittance spectroscopy. 10 In analogy with the energy-gap of semiconductors, the PBG properties depend on the lattice structure. Then, dielectric contrast among the lattice components, lattice parameters, and the number of layers affect the optical features generated by the DBR photonic structure. 11 Intuitively, a perturbation of

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Hybrid ZnO:polystyrene nanocomposite for all‐polymer photonic crystals

Cited by 31 publications

References 52 publications

Solution Processed Polymer-ABX4 Perovskite-Like Microcavities

Solution Processed Polymer-ABX4 Perovskite-Like Microcavities

High refractive index hyperbranched polyvinylsulfides for planar one‐dimensional all‐polymer photonic crystals

Flory–Huggins Photonic Sensors for the Optical Assessment of Molecular Diffusion Coefficients in Polymers

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