In the present paper, we study mechanism of antibacterial activity glutathione (GSH) coated silver nanoparticles (Ag NPs) on model Gram negative and positive bacterial strains. Interference in cell replication is observed for both cellular strains when exposed to GSH stabilized colloidal solution, microbicidal was studied Ag NPs are (i) dispersed suspensions or (ii) grafted thiol-functionalized glass surfaces. The obtained results confirm that effect capped (GSH Escherichia coli more intense...

Noble metal nanowaveguides supporting plasmon polariton modes are able to localize the optical fields at nanometer level for high sensitivity biochemical sensing devices. Here we report on design and fabrication of a novel photonic−plasmonic device which demonstrates label-free detection capabilities single inorganic nanoparticles monolayers organic compounds. In any case, determine Raman scattering signal enhancement limits that reach number molecules between 10 250. The can be...

We present an advanced and robust technology to realize 3D hollow plasmonic nanostructures which are tunable in size, shape, layout. The presented architectures offer new unconventional properties such as the realization of nanocavities with high electric field confinement enhancement, finely structured extinction profiles, broad band optical absorption. nature devices can overcome intrinsic difficulties related conventional a wide range multidisciplinary applications.

Monolayers of gold nanostars (GNS) are grafted on mercaptopropyltrimethoxysilane-coated glass slides. In the formed monolayers localized surface plasmon resonance GNS can be tuned in 700-1100 nm range. Upon laser excitation nearIR LSPR an efficient photothermal response is observed, inducing local hyperthermia and killing Staphylococcus aureus biofilms.

We establish a new strategy to achieve fast and responsive hybrid distributed Bragg reflectors for environmental vapor sensing. fabricated easily processable zinc oxide–polystyrene nanocomposites grow high quality multilayers with large gas permeability dielectric contrast, which enable sensitive detection of analytes. Multilayers by simple spin-coating the nanocomposite cellulose acetate show 10-fold enhancement optical response toluene exposure compared reference built bare polystyrene.

A layer of silver nanoplates, specifically synthesized with the desired localized surface plasmon resonance (LSPR) features, was grafted on amino-functionalized bulk glass surfaces to impart a double antibacterial action: (i) well-known, long-term effect based release Ag+; (ii) an “on demand” action which can be switched by use photo-thermal properties nano-objects. Irradiation these samples laser having wavelength falling into so called “therapeutic window” near infrared region allows...

The lack of sensors for low cost, extensive, and continuous detection vapor pollutants is a serious concern health safety in industrialized urban areas. Colorimetric sensors, such as distributed Bragg reflectors made polymers, could achieve this task thanks to their cost easy signal transduction but are typically affected by permeability selectivity without chemical labeling. Here we demonstrate all-polymer multilayers label-free selective organic volatile compounds. system exploits the...

Abstract Brilliance usually refers to the light reflected by facets of a gemstone such as diamond due its high refractive index. Nowadays, high‐refractive‐index materials find application in many optical and photonic devices are mostly inorganic nature. However, these obtained toxic or expensive production processes. Herein, synthesis thin‐film organic semiconductor, namely, polymeric carbon nitride, thermal chemical vapor deposition is presented. Among polymers, this material combines...

Abstract The energy gap law ( E G -law) and aggregation quenching are the main limitations to overcome in design of near-infrared (NIR) organic emitters. Here, we achieve unprecedented results by synergistically addressing both these limitations. First, propose porphyrin oligomers with increasing length attenuate effects -law suppressing non-radiative rate growth, increase radiative via enhancement oscillator strength. Second, side chains suppress quenching. We find that logarithmic...

Wide modulation of the band gap induced by organic cation replacement in FA_1−xMA_xSnBr₃ (0 ≤ <italic>x</italic> 1) solid solution.

High dielectric contrast polymer mirrors are used to recycle non-absorbed photons in organic luminescent solar concentrators. A 10% increase the concentrator optical efficiency is found and retained upon doubling its size paving way lightweight cheap building integrated photovoltaic systems.

We present a complete study both by experiments and model calculations of quantum dot strain engineering, which few optical properties nanostructures can be tailored using the dots as parameter. This approach used to redshift beyond 1.31μm and, possibly, towards 1.55μm room-temperature light emission InAs embedded in InGaAs confining layers grown on GaAs substrates. show that controlling simultaneously lower layer thickness layers’ composition, energy gap material band discontinuities...

The aim of this study was to develop cyclosporine A (CsA) loaded solid lipid nanoparticles (SLN) associated with chitosan (CS), improve interaction and internalization in corneal cells. SLN were prepared using high shear homogenization ultrasound methods CS the aqueous phase. phase based on Compritol or Precirol. characterized for particle size, polydispersity index, morphology, zeta potential encapsulation efficiency. systems freeze-dried increase physical stability trehalose used as a...

We study surface-enhanced Raman scattering (SERS) in fully dielectric periodic structures supporting Bloch surface waves. demonstrate a lower bound for the SERS enhancement of 50 when optical pump is resonantly coupled to wave supported by structure. A corresponding photoluminescence experiment shows an emission more than two orders magnitude, suggesting that actual ∼200. Analogous conclusions are obtained means semiclassical theoretical model. These results suggest alternative plasmonic...

Abstract Thanks to exciting chemical and optical features, perylene bisimide J‐aggregates are ideal candidates be employed for high‐performance plastic photonic devices. However, they generally tend form π–π stacked H‐aggregates that unsuitable implementation in polymer resonant cavities. In this work, the efficient compatibilization of a tailored forming robust J‐aggregated supramolecular polymers into amorphous polypropylene is introduced. The new nanocomposite then implemented an...

Abstract The exploitation of surface plasmon polaritons has been mostly limited to the visible and near infrared range, due low frequency limit for coherent excitation reduction confinement on metal lower energies. In this work we show that 3D - out plane nanostructures can considerably increase intrinsic quality optical output, light electric field enhancement factors, also in mid-infrared. We suggest physical principle relies combination far interactions between neighboring antennas,...

Silver nanoplates synthesized with the desired features directly on glass show a bimodal antibacterial action: Ag⁺release and NIR laser switchable hyperthermia.

We report the synthesis and characterization of a MASnxPb1–xBr3 (MA = methylammonium; nominal x 0, 0.2, 0.4, 0.5, 0.6, 0.8, 1) solid solution. The original synthetic method developed allowed one to obtain single-phase materials with homogeneous Sn/Pb distribution. All samples prepared are cubic, unit cell linearly decreases increasing value. optical response indicates linear trend (Vegard's law) band gap Sn content from 2.20 eV (x 0) 1.33 1), thus extending light absorption into near-IR.

Nanocrystals of Cs2SnX6 (X=Cl, Br, Br0.5I0.5 and I) have been prepared by a simple, optimized, hot-injection method, reporting for the first time synthesis Cs2SnCl6, Cs2SnBr6 mixed Cs2Sn(I0.5Br0.5)6 nanocrystalline samples. They all show cubic crystal structure with linear scaling lattice parameter changing halide size. The nanocrystals spherical shape average size from 3 to 6 nm depending on nature span an emission range 444 (Cs2SnCl6) 790 (Cs2SnI6) further modulation provided Br/I systems.

Solution processing of highly performing photonic crystals has been a towering ambition for making them technologically relevant in applications requiring mass and large-area production. It would indeed represent paradigm changer the fabrication sensors light management nanostructures meant photonics advanced photocatalytic systems. On other hand, solution-processed structures often suffer from low dielectric contrast poor optical quality or require complex deposition procedures due to...

Dielectric elastomer generators (DEGs) are electrostatic transducers capable of harvesting electrical energy from oscillating mechanical parts and storing it in a battery or supercapacitor. The conversion element typically consists flexible capacitor with variable capacitance that depends on the applied stress cycle requires an external voltage source (bias voltage). In designing device human gait, we propose integrating two components: dielectric fabricated using nanocomposite polyurethane...