Functional epoxy polymer for direct nano-imprinting of micro-optical elements

Fader, R.; Landwehr, Johannes; Rumler, Maximilian; Bauer, Anton J.; Frey, L.; Völkel, R.; Brehm, M.; Kraft, Andreas

doi:10.1016/j.mee.2013.02.030

Cited by 7 publications

(5 citation statements)

References 6 publications

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“…Over the last decade, there has been a noticeable development of materials from the group of polymer nanocomposites (PNCs), which are a combination of a polymer matrix with inorganic or hybrid nanoparticles. For the currently used types of inorganic fillers, inter alia, the following are included: SiO 2 [ 1 ], metal oxides (TiO 2 , Al 2 O 3 , Bi 2 O 3 , Zn0, CaCO 3 ) [ 2 – 6 ], metals (Au, Ag, Al, Fe) [ 7 – 9 ], SiC [ 10 ] and clays (saponite, montmorillonite, hectorite) [ 11 – 13 ]. In nanocomposites, which use inorganic materials at the nano-scale as reinforcement, there is a significant enhancement of properties with a much lower fraction of the reinforcing phase (≤10 wt %) compared to what is achievable using filler in the macroscale of the traditional composites.…”

Section: Introductionmentioning

confidence: 99%

Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO₂, TiO₂and Bi₂O₃nanoparticles

Tański

Matysiak

Hajduk

2016

Beilstein J. Nanotechnol.

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SummaryThe aim of this study was to produce nanocomposite polymer fibres, consisting of a matrix of polyacrylonitrile (PAN) and a reinforcing phase in the form of SiO2/TiO2/Bi2O3 nanoparticles, by electrospinning the solution. The effect of the nanoparticles and the electrospinning process parameters on the morphology and physical properties of the obtained composite nanofibres was then examined. The morphology of the fibres and the dispersion of nanoparticles in their volume were examined using scanning electron microscopy (SEM). All of the physical properties, which included the band gap width, dielectric constant and refractive index, were tested and plotted against the concentration by weight of the used reinforcing phase, which was as follows: 0%, 4%, 8% and 12% for each type of nanoparticles. The width of the band gap was determined on the basis of the absorption spectra of radiation (UV–vis) and ellipsometry methods. Spectroscopic ellipsometry has been used in order to determine the dielectric constant, refractive index and the thickness of the obtained fibrous mats.

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Section: Introductionmentioning

confidence: 99%

Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO₂, TiO₂and Bi₂O₃nanoparticles

Tański

Matysiak

Hajduk

2016

Beilstein J. Nanotechnol.

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“…The stabilizing particle surfactant directly influenced the optical properties of the composite. While the surfactant TBC was already known to promote the particle stabilization in the matrix polymer KATIOBOND OM VE 110707 [35], the surfactants TMOS and TOPO are found to be equally compatible with the respective polymer while avoiding light absorption below 600 nm and yielding highly transparent composites over a spectral range from 400-1000 nm. The differences in absorption characteristics of composites could be ascribed only to the surfactant-particle interaction induced by charge-transfer in case of the aromatic surfactant TBC.…”

Section: Discussionmentioning

confidence: 99%

“…The increase of the composite RI with the particle-weight fraction is exemplarily illustrated in figure 5 for the composite containing TBC stabilized TiO 2 nanoparticles, covering a wavelength range from 350 nm to 1700 nm. The measurement refers to re-evaluated published data [35]. In reference to the RI of the pure polymer, the RI of the composite is consecutively increased over the whole wavelength range with increasing particle-weight fraction.…”

Section: Refractive Index Measurementmentioning

confidence: 99%

Optical polymers with tunable refractive index for nanoimprint technologies

et al. 2014

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In order to realize a versatile high throughput production of micro-optical elements, UV-curable polymer composites containing titanium dioxide nanoparticles were prepared and characterized. The composites are based on an industrial prototype epoxy polymer. Titanium dioxide nanoparticles smaller than 10 nm were synthesized by the nonaqueous sol method and in situ sterically stabilized by three different organic surfactants. The composites exhibit high transparency. Distinct alteration of optical transmission properties for visible light and near IR wavelength range could be avoided by adaption of the stabilizing organic surfactant. Most importantly, the refractive index (RI) of the composites that depends on the fraction of incorporated inorganic nanoparticles could be directly tuned. E.g. the RI at a wavelength of 635 nm of a composite containing 23 wt% titanium dioxide nanoparticles is increased to 1.626, with respect to a value of 1.542 for the pure polymer. Furthermore, it could be demonstrated that the prepared inorganic-organic nanocomposites are well suited for the direct fabrication of low-cost micro-optical elements by nanoimprint lithography. A low response of the optical composite properties to temperature treatment up to 220 °C with a shrinkage of only about 4% ensures its application for integrated micro-optical elements in industrial production.

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“…In display or lighting application, OLED without back light system will replace traditional LED as the direct view light source; therefore, the OLED light source provides thinner and lighter on the lighting or the display application, and has considerable market potential [1][2]. Efforts to improve OLEDs light extracting efficiency have been fueled by an eagerness to use micro-fabrication technology and to make micro lens array in the development of lighting application [3][4][5][6][7][8][9][10][11][12][13][14][15]. In this research, the Fresnel-like lens was provided and fabricated to enhance the light extracting of OLEDs.…”

Section: Introductionmentioning

confidence: 99%

To enhance light extraction of OLED devices by multi-optic layers including a micro lens array

et al. 2014

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In recent years, OLED has advantages including that larger light area, thinner thickness, excellent light uniformity, and can be as a flexible light source. Many display panel and lighting have been started to use the OLED due to OLED without back light system, thus how to make and employ light extracting layer could be important issue to enhance OLED brightness. The purpose of this study is to enhance the light extraction efficiency and light emitting area of OLED, so the micro lens array and the prism reflection layer were provided to enhance the surface light extracting efficiency of OLD. Finally the prism layer and diffusing layer were used to increase the uniformity of emitting area of OLED, which the efficiency of 31% increasing to compare with the OLED without light extracting film.

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Functional epoxy polymer for direct nano-imprinting of micro-optical elements

Cited by 7 publications

References 6 publications

Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO₂, TiO₂and Bi₂O₃nanoparticles

Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO₂, TiO₂and Bi₂O₃nanoparticles

Optical polymers with tunable refractive index for nanoimprint technologies

To enhance light extraction of OLED devices by multi-optic layers including a micro lens array

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Functional epoxy polymer for direct nano-imprinting of micro-optical elements

Cited by 7 publications

References 6 publications

Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO2, TiO2and Bi2O3nanoparticles

Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO2, TiO2and Bi2O3nanoparticles

Optical polymers with tunable refractive index for nanoimprint technologies

To enhance light extraction of OLED devices by multi-optic layers including a micro lens array

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Product

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Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO₂, TiO₂and Bi₂O₃nanoparticles

Manufacturing and investigation of physical properties of polyacrylonitrile nanofibre composites with SiO₂, TiO₂and Bi₂O₃nanoparticles