Development of single layer nanoparticle anti-reflection coating for polymer substrates

Moghal, Jonathan; Reid, Sacha; Hagerty, Lisa; Gardener, Martin; Wakefield, Gareth

doi:10.1016/j.tsf.2013.03.005

Cited by 27 publications

(18 citation statements)

References 26 publications

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“…Furthermore, the incorporation of silica particles into nanocomposite colloids offers many promising perspectives. Thus, hybrid particles with a core-shell structure are attracting a great deal of interest because of their diverse applications as catalysts 13 , protective coatings 14 , and drug delivery materials 15 . In addition, the physical features of the hybrid particles with core-shell structure provides a high surface area, controllable morphology and roughness 16 – 19 , protection and encapsulation of the core materials, and the promising conjugation moieties for a variety of chemical and biological molecules 20 – 26 .…”

Section: Introductionmentioning

confidence: 99%

Microfluidic preparation of monodisperse polymeric microspheres coated with silica nanoparticles

Kim

Jin

Jeong

et al. 2018

Sci Rep

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The synthesis of organic-inorganic hybrid particles with highly controlled particle sizes in the micrometer range is a major challenge in many areas of research. Conventional methods are limited for nanometer-scale fabrication because of the difficulty in controlling the size. In this study, we present a microfluidic method for the preparation of organic-inorganic hybrid microparticles with poly (1,10-decanediol dimethacrylate-co-trimethoxysillyl propyl methacrylate) (P (DDMA-co-TPM)) as the core and silica nanoparticles as the shell. In this approach, the droplet-based microfluidic method combined with in situ photopolymerization produces highly monodisperse organic microparticles of P (DDMA-co-TPM) in a simple manner, and the silica nanoparticles gradually grow on the surface of the microparticles prepared via hydrolysis and condensation of tetraethoxysilane (TEOS) in a basic ammonium hydroxide medium without additional surface treatment. This approach leads to a reduction in the number of processes and allows drastically improved size uniformity compared to conventional methods. The morphology, composition, and structure of the hybrid microparticles are analyzed by SEM, TEM, FT-IR, EDS, and XPS, respectively. The results indicate the inorganic shell of the hybrid particles consists of SiO2 nanoparticles of approximately 60 nm. Finally, we experimentally describe the formation mechanism of a silica-coating layer on the organic surface of polymeric core particles.

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Section: Introductionmentioning

confidence: 99%

Microfluidic preparation of monodisperse polymeric microspheres coated with silica nanoparticles

Kim

Jin

Jeong

et al. 2018

Sci Rep

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“…This widens the design window for intricately structured hybrid latex particles and their possible applications, including all those cases where inorganic materials are used in combination with polymers. Among them, the addition of (modified) silica nanoparticles in coatings resulted in the improvement of dirt pick-up, 7 and optical properties 8 and scratch resistance. 9 The approaches adopted for the waterborne synthesis of nanocomposite polymer latexes generally differ in whether the polymerization and/or the synthesis of the inorganic component is conducted in situ or ex situ.…”

Section: Introductionmentioning

confidence: 99%

A mechanistic investigation of Pickering emulsion polymerization

Lotierzo

Bon

2017

Polym. Chem.

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A note on versions:The version presented here may differ from the published version or, version of record, if you wish to cite this item you are advised to consult the publisher's version. Please see the 'permanent WRAP URL' above for details on accessing the published version and note that access may require a subscription. Pickering emulsion polymerization offers a versatile way of synthetising hybrid core-shell latexes where a polymer core is surrounded by an armour of inorganic nanoparticles. A mechanistic understanding of the polymerization process is limited which restricts the use of the technique in the fabrication of more complex, multilayered colloids. In this paper clarity is provided through an in-depth investigation into the Pickering emulsion polymerization of methyl methacrylate (MMA) in the presence of nano-sized colloidal silica (Ludox TM-40). Mechanistic insights are discussed by studying both the adsorption of the stabiliser to the surface of the latex particles and polymerization kinetics. The adhesion of the Pickering nanoparticles was found not to be spontaneous, as confirmed by cryo-TEM analysis of MMA droplets in water and monomer-swollen PMMA latexes. This supports the theory that the inorganic particles are driven towards the interface as a result of a heterocoagulation event in the water phase with a growing oligoradical. The emulsion polymerizations were monitored by reaction calorimetry in order to establish accurate values for monomer conversion and the overall rate of polymerizations (Rp). Rp increased for higher initial silica concentrations and the polymerizations were found to follow pseudo-bulk kinetics.

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“…The single-layer AR coating consists of a dielectric thin film. As the thin films have a specially chosen thickness, the interference effects in the AR coating will cause the wave to be reflected from the top surface of the coating layers to be out of phase with the wave reflected from the surfaces of the semiconductor [9]. For that, the thin films can have an effect of zero reflectance at the center light wavelength which can decrease reflectance for light wavelengths in a broad band around the center.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Antireflection Nb2O5 Thin Films by the Sputtering Method under Different Deposition Parameters

et al. 2016

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In this study, Nb2O5 ceramic was used as the target to deposit the Nb2O5 thin films on glass substrates with the radio frequency (RF) magnetron sputtering method. Different deposition temperatures and O2 ratios were used as parameters to investigate the optical properties of Nb2O5 thin films. The deposition parameters were a pressure of 5 × 10−3 Torr, a deposition power of 100 W, a deposition time of 30 min, an O2 ratio (O2/(O2 + Ar), in sccm) of 10% and 20%, and deposition temperatures of room temperature (RT), 200, 300 and 400 °C, respectively. We found that even if the deposition temperature was 400 °C, the deposited Nb2O5 thin films revealed an amorphous phase and no crystallization phase was observed. The optical properties of transmittance of Nb2O5 thin films deposited on glass substrates were determined by using a ultraviolet-visible (UV-vis) spectrophotometer (transmittance) and reflectance spectra transmittance (reflectance, refractive index, and extinction coefficient) in the light wavelength range of 250–1000 nm. When the O2 ratio was 10% and the deposition temperature increased from RT to 200 °C, the red-shift was clearly observed in the transmittance curve and the transmission ratio had no apparent change with the increasing deposition temperature. When the O2 ratio was 20%, the red-shift was not observed in the transmittance curve and the transmission ratio apparently decreased with the increasing deposition temperature. The variations in the optical band gap (Eg) values of Nb2O5 thin films were evaluated from the Tauc plot by using the quantity hν (the photon energy) on the abscissa and the quantity (αhν)r on the ordinate, where α is the optical absorption coefficient, c is the constant for direct transition, h is Planck’s constant, ν is the frequency of the incident photon, and the exponent r denotes the nature of the transition. As the O2 ratio of 10% or 20% was used as the deposition atmosphere, the measured Eg values decreased with the increase of the deposition temperature. The reflectance ratio, extinction coefficient, and refractive index curves of Nb2O5 thin films were also investigated in this study. We would show that those results were influenced by the deposition temperature and O2 ratio.

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Development of single layer nanoparticle anti-reflection coating for polymer substrates

Cited by 27 publications

References 26 publications

Microfluidic preparation of monodisperse polymeric microspheres coated with silica nanoparticles

Microfluidic preparation of monodisperse polymeric microspheres coated with silica nanoparticles

A mechanistic investigation of Pickering emulsion polymerization

Investigation of Antireflection Nb2O5 Thin Films by the Sputtering Method under Different Deposition Parameters

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