Influence of hybrid organic–inorganic sol–gel matrices on the photophysics of amino-functionalized UV-sensitizers

Oubaha, Mohamed; Copperwhite, R.; Boothman, Catherine; Ovsianikov, Aleksandr; Kiyan, R.; Purlys, Vytautas; O’Sullivan, Mary C.; McDonagh, Colette; Chichkov, Boris N.; Gadonas, R.; MacCraith, Brian D.

doi:10.1007/s10853-010-4853-1

Cited by 17 publications

(14 citation statements)

References 19 publications

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“…5) despite that laser irradiation was 155 times larger, pulse energy was 51 times higher, and concentration of the photo-initiator was 4 times higher in experiments with the fundamental harmonics than in experiments with the second harmonics. The reason for this effect is that the maximum in the absorption spectrum of the used material (SZ2080 with BIS photoinitiator in a solid state) is at ~470 nm [26] close to the wavelength of the second harmonics of the used laser (515 nm). It means that by using the second harmonics, the single-photon polymerization took place, and by using the fundamental harmonics (1030 nm) the multi-photon polymerization took place.…”

Section: Structures Fabricated By Holographic Lithography With a Diffmentioning

confidence: 99%

Fabrication of periodic micro-structures by holographic lithography

Stankevičius¹,

Gedvilas²,

Voisiat³

et al. 2013

Lith. J. Phys.

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The principles of the holographic lithography technique are reviewed, and the ability in the formation of structures with different periods by the holographic lithography technique in SZ2080 is demonstrated. The influence of laser exposure, phase shift between interfering laser beams, and the used laser wavelength on the structures fabricated by the four-beam interference technique has been studied. It is shown that by using the interfering beams with a different phase is it possible to reduce the period of the structure √ − 2 times compared to the four interfering beams of the same phase. Fabrication of micro-structures by the holographic lithography technique can be realized via multi-photon and single-photon polymerization processes. The structures created by these two techniques are compared. Finally, in the experiments with the five-beam interference, the doubleperiod effect was observed by adding the zero-order beam with a low intensity. The fabricated periodic microstructures have the potential to be used as a scaffold for cell growth and micro-optics.

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Section: Structures Fabricated By Holographic Lithography With a Diffmentioning

confidence: 99%

Fabrication of periodic micro-structures by holographic lithography

Stankevičius¹,

Gedvilas²,

Voisiat³

et al. 2013

Lith. J. Phys.

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“…The affinity of polyhedral oligosilsesquioxanes to various polymer materials can be easily controlled by the selection of the structure of the surrounding organic group. Methacrylate [6][7][8], epoxy [12] and amine [13,14] are some examples of functional groups that have been incorporated into the organic part of oligosilsesquioxanes in order to optimize the molecular structure of cubic-oligosilsesquioxane according to different objectives. In a previous study [13], we synthesized SSQO functionalized with amino groups from 3-(aminopropyl)triethoxysilane (APS).…”

Section: Introductionmentioning

confidence: 99%

Polymerization of methacrylate resins photoinitiated by camphorquinone and bulky amine-functionalized silsesquioxanes

et al. 2012

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Polyhedral oligomeric silsesquioxanes (SSQO) functionalized with bulky amino groups were prepared by a two-stage synthesis procedure. In a first stage, a modified organotrimethoxysilane was synthesized by reacting 1 mol of N-(b-aminoethyl)-c-aminopropyltrimethoxysilane with 3 mol of 1,2-epoxy-3-phenoxypropane. The second stage consisted of the hydrolytic condensation of the modified silane catalyzed by formic acid. Methacrylate resins were activated for visible light polymerization by the addition of camphorquinone (CQ) in combination with different mass fractions of SSQO. The progress of monomer conversion versus irradiation time showed that the CQ/SSQO pair is an efficient photoinitiator system because a fast reaction and high conversion results from 60 s irradiation at 600 mW/ cm 2 . The SSQO were incorporated up to 22 wt% in the methacrylate resin without compromising the flexural or the compressive properties of the final material.

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“…The absorption for the sol-gel containing 1 mol.% of DPHDES was higher than for the one containing 0.01 mol.% of MAAH. This can be explained by the presence of aromatic compounds in the DPHDES which are known to present stronger absorption in the UV range [16]. The roughness of the thin films, as measured by an optical profilometer, revealed that on average the materials composed of DPHDES exhibit surface inhomogeneities approximately two times higher, compared to the MAAH based materials, as shown in figure 7 and 8.…”

Section: Optical Qualitymentioning

confidence: 94%

Hybrid zirconium sol-gel thin films with high refractive index

Gorin

Copperwhite

Elmaghrum

et al. 2011

International Symposium on Photoelectronic Detection and Imaging 2011: Sensor and Micromachined Optical Device Technologies

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We describe the synthesis of optical quality thin film materials with high refractive index, employing zirconium based hybrid sol-gel precursors. As the zirconium propoxide precursor is unstable in the presence of a strong nucleophilic agent such as water, two synthesis routes have been performed employing a chelating agent and an organosilane precursor to avoid the formation of any undesired ZrO 2 agglomerates, leading to organo-zirconate complexes and silicato-zirconate copolymers, respectively. The prepared hybrid sol-gel materials were deposited by spin-coating to form a transparent thin film on silicon substrates, and heat treated at 100 °C for the final stabilisation of the layer. The effect of the two synthesis routes on the optical properties of zirconium based hybrid sol-gel material is discussed. It was found that the nature and concentration of the organosilane precursor can significantly affect the structural properties of the deposited films. A correlation was also demonstrated between the concentration of the organosilane precursor and the refractive index of the material. By reducing the concentration of organosilane precursor, high refractive index materials were obtained. Similar behaviour was observed for the materials synthesised via chelating agent. The synthesis employing an organosilane precursor produces films with higher refractive index. A maximum refractive index of 1.746 was measured at 635nm for the deposited thin films.

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Influence of hybrid organic–inorganic sol–gel matrices on the photophysics of amino-functionalized UV-sensitizers

Cited by 17 publications

References 19 publications

Fabrication of periodic micro-structures by holographic lithography

Fabrication of periodic micro-structures by holographic lithography

Polymerization of methacrylate resins photoinitiated by camphorquinone and bulky amine-functionalized silsesquioxanes

Hybrid zirconium sol-gel thin films with high refractive index

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