Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously Achievable in a Single Device. 8. Selectivity at Poly(vinyl alcohol)-Polyelectrolyte Blend Modified Optically Transparent Electrodes

Gao, Letian; Seliskar, Carl J.; Heineman, William R.

doi:10.1002/1521-4109(200105)13:8/9<613::aid-elan613>3.0.co;2-z

Cited by 21 publications

(21 citation statements)

References 11 publications

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“…For the last several years, our research group has been developing a spectroelectrochemical sensor that combines the functional components of (a) selective partitioning, (b) electrochemistry and (c) optical spectroscopy into a single device ( Shi et al 1997a, b , Gao et al 1999, Gao et al 2001, Slaterbeck et al 2000, Slaterbeck et al 1999, DiVirgilio-Thomas et al 2000, Maizels et al 2000, Maizels et al 2002, Ross et al 2000, Richardson et al 2002, Kaval et al 2003, Stegemiller et al 2003. This sensor is based on a novel device that incorporates multiple internal reflection (MIR) spectroscopy in an optically transparent electrode (OTE) coated with a selective film ( Kaval et al 2003 ).…”

Section: Three Component Sensormentioning

confidence: 99%

Three-component spectroelectrochemical sensor module for the detection of pertechnetate (TcO4-)

Chatterjee

Bryan

Seliskar

et al. 2013

Reviews in Analytical Chemistry

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This review looks at the advancements in the development of a sensor for technetium (Tc) that is applicable to characterizing and monitoring the vadose zone and associated subsurface water. Subsurface contamination by Tc is of particular concern for two reasons: the long lifetime of its most common isotope 99 Tc (half-life = 2 × 10 5 years) and the fast migration in soils of pertechnetate (TcO 4 -), which is considered to be the dominant 99 Tc species in ground water. TcO 4 -does not have a characteristic spectral signature which prevents its rapid, sensitive, and economic in situ detection. To address this problem, a novel spectroelectrochemical sensor has been designed, that combines three modes of selectivity (electrochemistry, spectroscopy, and selective partitioning) into a single sensor to substantially improve specificity, which is critical in the specific detection of an analyte in the presence of potential interfering species. The sensor consists of a basic spectroelectrochemical configuration: a waveguide with an optically transparent electrode (OTE) that is coated with a thin chemically-selective film that preconcentrates the analyte. The key to adapting this generic sensor to detect TcO 4 -and Tc complexes lies in the development of chemically-selective films that preconcentrate the analyte and, when necessary, chemically convert it into a complex with electrochemical and spectroscopic properties appropriate for sensing. The chemically selective films can be combined with ligands which are capable of reacting with TcO 4 -to form coordination complexes, the spectral properties of which can be used to enhance the sensitivity of detection. The first half of this review describes the general concept of the sensor and the rationale for the selection of its specific components, and the development and characterization of the sensor for the different detection modules. The second half summarizes the synthesis and characterization of complexes relevant for the detection of technetium, and the progress in the utilization of the sensor module for the effective detection of these complexes.

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Section: Three Component Sensormentioning

confidence: 99%

Three-component spectroelectrochemical sensor module for the detection of pertechnetate (TcO4-)

Chatterjee

Bryan

Seliskar

et al. 2013

Reviews in Analytical Chemistry

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“…A spectroelectrochemical sensor utilizing three modes of selectivity has been developed by our group. [1][2][3][4][5][6][7][8][9][10] The sensor in its most common form consists of a multilayer assembly of transparent thin films anchored on a slab of optical glass as shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

Further Investigations on a Poly(Vinyl Alcohol)— Polyelectrolyte Chemically Selective Optical Film

et al. 2004

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The ionomer poly(vinylbenzyltrimethylammonium chloride) has been blended with cross-linked poly(vinyl alcohol) to form optically clear composites that can be covalently linked as thin films to oxide surfaces. Films are characterized using spectroscopic ellipsometry with refractive index (n) and extinction coefficient (k) data presented for wavelengths 300 to 1100 nm. A refractive index of 1.54 and average thickness of 709 nm are typical of an air dry film prepared by spin-coating. Dynamic in situ ellipsometry results for films exposed to 0.1 M KNO(3) and 1.0 mM Fe(CN)(6)(-3) are presented. Upon initial exposure to 0.1 M KNO(3), an air dry film expands by about 160% and stabilizes in size and refractive index at about 18 hours. Ion exchange of film cationic groups with ferricyanide is marked by slight film contraction, presumably due to electrostatic cross-linking by the multivalent anion. These films are useful in the spectroelectrochemical sensor with our newly developed fluorescence detection mode, as demonstrated by results of the reversible incorporation of the fluorescent anion fluorescein.

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“…The spectroelectrochemical sensors developed by the University of Cincinnati (Andria et al 2004;DiVirgilio-Thomas et al 2000;Gao et al 2001;Kaval et al 2003;Maizels et al 2002;Shi et al 1997a;Shi et al 1998;Shi et al 1997b;Slaterbeck et al 1999;Slaterbeck et al 2000;Wansapura et al 2007) consist of an optically transparent electrode (OTE) coated with a thin sensing film in contact with an aqueous sample phase. The thin film serves to preconcentrate the analyte and also excludes at least some of the potential interferences in the aqueous sample phase.…”

Section: Selective Partitioning Of Re-carbonyl and Other Model Complementioning

confidence: 99%

“…The procedure used has been described elsewhere. (Gao and Seliskar 1998;Gao et al 1999;Gao et al 2001).…”

Section: Preparation Of Ion-selective Thin Filmsmentioning

confidence: 99%

Non-Pertechnetate Technetium Sensor Research and Development

Bryan

Crawford

Heineman

et al. 2014

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Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously Achievable in a Single Device. 8. Selectivity at Poly(vinyl alcohol)-Polyelectrolyte Blend Modified Optically Transparent Electrodes

Cited by 21 publications

References 11 publications

Three-component spectroelectrochemical sensor module for the detection of pertechnetate (TcO4-)

Three-component spectroelectrochemical sensor module for the detection of pertechnetate (TcO4-)

Further Investigations on a Poly(Vinyl Alcohol)— Polyelectrolyte Chemically Selective Optical Film

Non-Pertechnetate Technetium Sensor Research and Development

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