Sol-gel coatings for optical chemical sensors and biosensors

MacCraith, Brian D.; McDonagh, Colette; O'Keeffe, Gerard; McEvoy, Aisling K.; Butler, Thomas M.; Sheridan, F.

doi:10.1016/0925-4005(95)01662-7

Cited by 168 publications

(56 citation statements)

References 16 publications

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“…Most of these requirements are met by inks made of inorganic compounds that undergo a transition from a sol state in the ink to a solid xerogel state upon drying on a substrate [15]. The use of small nanoparticles in the ink makes it possible to create xerogels having porosity close to that in the bulk materials [16].…”

Section: Introductionmentioning

confidence: 99%

Inkjet printing of transparent sol-gel computer generated holograms

Yakovlev¹,

Pidko²,

Vinogradov³

2016

Opt. Mater. Express

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In this paper we report for the first time a method for the production of transparent computer generated holograms by desktop inkjet printing. Here we demonstrate a methodology suitable for the development of a practical approach towards fabrication of diffraction patterns using a desktop inkjet printer and nonocrystalline sol-gel ink. In particular, the reported inkjet printing method can be used to generate transparent diffraction structures on supports such as those widely applied in security technologies. Transparent highly refractive layers were deposited with a high precision via a wet-to-dry printing method based on the sol-gel transition phenomenon. With this approach we were able to print a diffraction pattern by TiO 2 xerogel, with which a transparent computer generated hologram was created. We argue that this new technology can form the foundation for a new generation of commercial protective coating technologies applied by industrial inkjet printing. Adv. Func. Mater. 25, 7375-7380 (2015). 23. Y. Han, C. Wei, and J. Dong, "Super-resolution electrohydrodynamic (EHD) 3d printing of micro-structures using phase-change inks," Manuf. Lett. 2, 96 -99 (2014). 24.

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Section: Introductionmentioning

confidence: 99%

Inkjet printing of transparent sol-gel computer generated holograms

Yakovlev¹,

Pidko²,

Vinogradov³

2016

Opt. Mater. Express

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“…The oxygen sensors are based on quenchometric sensing and use nano-/microporous xerogels to reliably encapsulate the luminophore [Ru(bpy) 3 ] 2+ molecules during the sensor operation. Xerogels are nano-/micro-porous glasses and their appeal for biorecognition elements derives from their thermal stability, tunable pore dimensions and distributions, biocompatibility, and a broad optical transparency window [12]. We employ a novel strategy to immobilize the xerogel sensors over the neural electrode array.…”

Section: Direct-write Fabrication Of Hollow Polymer Waveguide Structuresmentioning

confidence: 99%

Brain machine interfaces combining microelectrode arrays with nanostructured optical biochemical sensors

et al. 2009

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Neural microelectrodes are an important component of neural prosthetic systems which assist paralyzed patients by allowing them to operate computers or robots using their neural activity. These microelectrodes are also used in clinical settings to localize the locus of seizure initiation in epilepsy or to stimulate sub-cortical structures in patients with Parkinson's disease. In neural prosthetic systems, implanted microelectrodes record the electrical potential generated by specific thoughts and relay the signals to algorithms trained to interpret these thoughts. In this paper, we describe novel elongated multi-site neural electrodes that can record electrical signals and specific neural biomarkers and that can reach depths greater than 8mm in the sulcus of non-human primates (monkeys). We hypothesize that additional signals recorded by the multimodal probes will increase the information yield when compared to standard probes that record just electropotentials. We describe integration of optical biochemical sensors with neural microelectrodes. The sensors are made using sol-gel derived xerogel thin films that encapsulate specific biomarker responsive luminophores in their nanostructured pores. The desired neural biomarkers are O2, pH, K+, and Na+ ions. As a prototype, we demonstrate direct-write patterning to create oxygen-responsive xerogel waveguide structures on the neural microelectrodes. The recording of neural biomarkers along with electrical activity could help the development of intelligent and more userfriendly neural prosthesis/brain machine interfaces as well as aid in providing answers to complex brain diseases and disorders.

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“…Much progress has been made on transition-metal complex-based oxygen sensors. These sensors however are susceptible to several limitations such as short lifetime (ns-µs range) 7 and low sensitivity (fluorescence intensity variation less than 10 times between oxygen concentration of 0-100%) 5 . Poly(arylene vinylene)s, PAVs are of special interest in the field of materials for solid state electronic 8,9,10 .…”

Section: Introductionmentioning

confidence: 99%

“…Most optical oxygen sensors in the literature are based on fluorescence quenching of the fluorophore such as transition-metal complex (e.g. ruthenium(II) (Ru(II)) complexes), embedded in polymer or in sol-gel matrices 4,5,6 . Much progress has been made on transition-metal complex-based oxygen sensors.…”

Section: Introductionmentioning

confidence: 99%

Optical Response of Poly (1,4-Phenylene-1,2-Di (P-Phenoxyphenyl) Vinylene) Towards Oxygen Gas

Mehamod

Daik

Ahmad

2017

AJSTD

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This research involved the synthesis of poly (1,4-phenylene-1,2-di (p-phenoxyphenyl) vinylene), dpop-PDV from di (p-phenoxybenzoyl) benzene compound as the monomer. The potential of the produced polymer as sensing reagent for O 2 detection based on fluorescence quenching was studied. Di (p-phenoxybenzoyl) benzene was synthesised via the Friedel-Crafts benzoylation with terephthaloydichloride and biphenylether as starting materials and anhydrous AlCl 3 as the catalyst, while the dpop-PDV was synthesized via the McMurry coupling reaction. The polymerization was carried out in THF with TiCl 4 and Zn as the catalyst and reducing agent respectively. Characterization on monomer and polymer had been carried out by using FTIR, GCMS, DSC, TGA, GPC and melting point measurement. Response of the polymer towards oxygen gas was described in terms of fluorescence spectra, repeatability, reproducibility and the response curve. Results obtained showed that the fluorescence intensity decreased upon exposure to O 2 gas, indicating that the polymer was responsive to the presence of the O 2 gas and the sample was found regenerable by flushing the polymer solution with N 2 gas.

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Sol-gel coatings for optical chemical sensors and biosensors

Cited by 168 publications

References 16 publications

Inkjet printing of transparent sol-gel computer generated holograms

Inkjet printing of transparent sol-gel computer generated holograms

Brain machine interfaces combining microelectrode arrays with nanostructured optical biochemical sensors

Optical Response of Poly (1,4-Phenylene-1,2-Di (P-Phenoxyphenyl) Vinylene) Towards Oxygen Gas

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