&lt;title&gt;New chemically selective optical materials for waveguide sensors&lt;/title&gt;

Gao, Letian; Shi, Yining; Slaterbeck, Andrew F.; Seliskar, Carl J.; Heineman, William R.

doi:10.1117/12.304364

Cited by 6 publications

(3 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The fabrication of thin films of other matrixes of cross-linked imprinted polymers, like sol−gel, , and polyurethane 7 is well established, mainly because the polymerization occurs spontaneously. Radical polymerization of acrylic monomers is dependent not only on the initiating stimulus (light/heat) but also on the absence of radical quenchers, pressure, and solvent.…”

Section: Introductionmentioning

confidence: 99%

Molecular Imprinting in Thin Films of Organic−Inorganic Hybrid Sol−Gel and Acrylic Polymers

Marx

Liron

2001

Chem. Mater.

View full text Add to dashboard Cite

The molecular imprinting technique was applied on a model compound, propranolol, using two polymeric systems, acrylic and hybrid organic-inorganic sol-gels. The polymers were applied as thin films on glass substrates. The preparation of thin films of imprinted acrylic polymers required the development of a new polymerization system. The binding properties of the two polymers toward propranolol were characterized by radioactive and fluorimetric assay procedures. The acrylic system was found to have high uptake toward propranolol, but this was accompanied by a high degree of nonspecific binding. The sol-gel system had lower uptake, but remarkably lower nonspecific binding (<10%). The K d of the sol-gel matrix to propranolol is 80 ( 6 nM, a value that is common in biological systems. The binding was found to be solvent sensitiveswith high affinity and specificity in aqueous solution, which was completely lost in organic solvents. The uptake kinetics of the acrylic polymer was significantly slower than the sol-gel polymer, reaching saturation after 10 h, relative to <1 h for the sol-gel polymer. Imprinting of the sol-gel film with enantiomerically pure (S)propranolol resulted in its pronounced chiral recognition over the (R)-enantiomer.

show abstract

Section: Introductionmentioning

confidence: 99%

Molecular Imprinting in Thin Films of Organic−Inorganic Hybrid Sol−Gel and Acrylic Polymers

Marx

Liron

2001

Chem. Mater.

View full text Add to dashboard Cite

show abstract

“…Recently, we have been developing new polymeric materials for chemical sensing and investigating the applications of these materials for fiber-optic and spectroelectrochemical sensors. , Compared with sol−gel polyelectrolyte composites, polymeric materials are advantageous in these applications because they can be covalently coated onto indium tin oxide (ITO)−glass easily, form more optically transparent blends, , and sometimes are regenerateable …”

mentioning

confidence: 99%

Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously Achievable in a Single Device. 4. Sensing with Poly(vinyl alcohol)−Polyelectrolyte Blend Modified Optically Transparent Electrodes

1999

Self Cite

View full text Add to dashboard Cite

The feasibility of using polymer blend thin films covalently attached to indium tin oxide-glass, via the silane coupling agent (3-aminopropyl)triethoxysilane, for performing spectroelectrochemical modulation is demonstrated in aqueous solutions. The polymer blends were formulated by entrapping three polyelectrolytesspoly(vinylbenzyltrimethylammonium chloride) (PVTAC), poly(acrylic acid), and Nafionsin cross-linked poly(vinyl alcohol) (PVA) matrix for the purpose of selectively incorporating solution-phase anions and cations. Ru(BiPy) 3 2+ (BiPy ) 2,2′bipyridine), Ru(CN) 6 4-, and Fe(CN) 6 3were chosen as the analytes for their suitable optical and electrochemical properties. Peak current enhancements, compared with the bare electrode under the same conditions, ranging from 2 to 7 were observed for these systems with the largest being for Fe(CN) 6 3at an electrode coated with PVA-PVTAC blend. The optical absorbance change under attenuated total reflection during cyclic voltammetry (spectroelectrochemical modulation) was observed for all systems. The effects of potential window, electrochemical reversibility of the analyte, and potential scan rate on the resulting absorbance-time plot for modulation by cyclic voltammetry are reported for the different analytepolymer blend systems. The modulation transfer ratios of analyte-polymer systems were studied. Modulation at 450 nm resulting from oxidation/reduction of the Ru(BiPy) 3 2+/3+ couple at 1.30 and 0.90 V vs Ag/AgCl with varying concentrations was used to construct analytical working curves for the spectroelectrochemical sensor.

show abstract

“…In both optical and electrochemical sensing, the partitioning of an analyte molecule from a solution-phase molecule into a thin porous solid film on a transducer is a process that is fundamental in chemical sensing . As a result, much attention has been paid to the formulation and preparation of such thin solid films, − which are typically several to several hundred nanometers thick. In a recent application, we have focused on making thin chemically selective films for chemical sensing within radioactive wastes ,,− and sensing of radioactive technetium compounds in environmental samples .…”

mentioning

confidence: 99%

Luminescence-Based Spectroelectrochemical Sensor for [Tc(dmpe)₃]^2+/+ (dmpe = 1,2-bis(dimethylphosphino)ethane) within a Charge-Selective Polymer Film

et al. 2011

Self Cite

View full text Add to dashboard Cite

A spectroelectrochemical sensor consisting of an indium tin oxide (ITO) optically transparent electrode (OTE) coated with a thin film of partially sulfonated polystyrene-blockpoly(ethylene-ran-butylene)-block-polystyrene (SSEBS) was developed for [Tc(dmpe)(3)](+) (dmpe = 1,2-bis(dimethylphosphino)ethane). [Tc(dmpe)(3)](+) was preconcentrated by ion-exchange into the SSEBS film after a 20 min exposure to aqueous [Tc(dmpe)(3)](+) solution, resulting in a 14-fold increase in cathodic peak current compared to a bare OTE. Colorless [Tc(dmpe)(3)](+) was reversibly oxidized to colored [Tc(dmpe)(3)](2+) by cyclic voltammetry. Detection of [Tc(dmpe)(3)](2+) was accomplished through emission spectroscopy by electrochemically oxidizing the complex from nonemissive [Tc(dmpe)(3)](+) to emissive [Tc(dmpe)(3)](2+). The working principle of the sensor consisted of electrochemically cycling between nonemissive [Tc(dmpe)(3)](+) and emissive [Tc(dmpe)(3)](2+) and monitoring the modulated emission (λ(exc) = 532 nm; λ(em) = 660 nm). The sensor gave a linear response over the concentration range of 0.16-340.0 μM of [Tc(dmpe)(3)](2+/+) in aqueous phase with a detection limit of 24 nM.

show abstract

<title>New chemically selective optical materials for waveguide sensors</title>

Cited by 6 publications

References 24 publications

Molecular Imprinting in Thin Films of Organic−Inorganic Hybrid Sol−Gel and Acrylic Polymers

Molecular Imprinting in Thin Films of Organic−Inorganic Hybrid Sol−Gel and Acrylic Polymers

Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously Achievable in a Single Device. 4. Sensing with Poly(vinyl alcohol)−Polyelectrolyte Blend Modified Optically Transparent Electrodes

Luminescence-Based Spectroelectrochemical Sensor for [Tc(dmpe)₃]^2+/+ (dmpe = 1,2-bis(dimethylphosphino)ethane) within a Charge-Selective Polymer Film

Contact Info

Product

Resources

About

<title>New chemically selective optical materials for waveguide sensors</title>

Cited by 6 publications

References 24 publications

Molecular Imprinting in Thin Films of Organic−Inorganic Hybrid Sol−Gel and Acrylic Polymers

Molecular Imprinting in Thin Films of Organic−Inorganic Hybrid Sol−Gel and Acrylic Polymers

Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously Achievable in a Single Device. 4. Sensing with Poly(vinyl alcohol)−Polyelectrolyte Blend Modified Optically Transparent Electrodes

Luminescence-Based Spectroelectrochemical Sensor for [Tc(dmpe)3]2+/+ (dmpe = 1,2-bis(dimethylphosphino)ethane) within a Charge-Selective Polymer Film

Contact Info

Product

Resources

About

Luminescence-Based Spectroelectrochemical Sensor for [Tc(dmpe)₃]^2+/+ (dmpe = 1,2-bis(dimethylphosphino)ethane) within a Charge-Selective Polymer Film