Optically Transparent Polyelectrolyte−Silica Composite Materials:  Preparation, Characterization, and Application in Optical Chemical Sensing

Shi, Yining; Seliskar, Carl J.

doi:10.1021/cm960495k

Cited by 85 publications

(77 citation statements)

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“…The polymer blend consisting of 2.50 mL 10% (w/v) PVA, 0.50 mL 15% (v/v) PVTAC, 1.50 mL 5% (v/v) glutaraldehyde, and 0.20 mL 0.5 M HCl in distilled water was mixed gently until homogeneous. A pipet tip was used to spread 300 mL of the polymer blend on the ITO-coated surface of the slide before spinning at 5 000 rpm for 30 s. PDMDAAC-SiO 2 films were made according to a previously published procedure [30]. Briefly, 4 mL of TEOS, 2 mL of deionized water, and 0.1 mL of 0.1 M HCl were placed into a small container with a stir bar, capped, and stirred for 3.5 h. Then, 1.5 mL of the silica sol solution were added to a solution of 2 mL of 5% (v/v) PDMDAAC in deionized water.…”

Section: Film Preparation and Characterizationmentioning

confidence: 99%

Characterization of ABTS at a Polymer‐Modified Electrode

et al. 2004

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ABTS, 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonate), a colorless dianion that forms a colored radical upon oxidation, was characterized with electrochemistry and spectroscopy and demonstrated to be a detectable analyte in a polymer-modified spectroelectrochemical sensor. Three positively charged polymers were incorporated into a thin film on an indium tin oxide (ITO) optically transparent electrode and used to concentrate ABTS at the electrode surface. Of the three films, poly(vinylbenzyl trimethyl ammonium chloride)-poly(vinyl alcohol) (PVTAC-PVA), poly(diallyldimethylammonium chloride)-silica (PDMDAAC-SiO 2 ), and quaternized poly(4-vinyl-N-methylpyridinium nitrate)-silica (QPVP-SiO 2 ), PVTAC-PVA demonstrated the best ability to absorb ABTS. Within 20 min, a change of 0.2 absorbance units at 417 nm and 13.6 mA/cm 2 in anodic peak current density in cyclic voltammetry at a scan rate of 0.025 V/s were observed.

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Section: Film Preparation and Characterizationmentioning

confidence: 99%

Characterization of ABTS at a Polymer‐Modified Electrode

et al. 2004

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“…All of the films developed thus far for the detection of anions have been prepared using polymers containing quaternary amine groups [3,7,9,12,13]. Among polycations quaternized poly(4-vinylpyridine), QPVP, stands out as a candidate for incorporation into the sensor.…”

Section: Tcomentioning

confidence: 99%

Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously Achievable in a Single Device. 19. Preparation and Characterization of Films of Quaternized Poly(4‐vinylpyridine)‐silica

Conklin¹,

Heineman²,

Seliskar³

2007

Electroanalysis

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Quaternized poly(4-vinylpyridine) (QPVP) has been incorporated as an anion exchanger into sol-gel derived silica films for use in a spectroelectrochemical sensor. The preparation, characteristics and performance of these films are described. The films, which are spin-coated onto the surface of a planar optically transparent electrode, are optically transparent and uniform. Scanning electron microscopy and spectroscopic ellipsometry have been used to examine film structure, thickness and optical properties. These films have been shown both spectroscopically and electrochemically to preconcentrate ferrocyanide, a model analyte for the sensor. The films can be regenerated for multiple measurements by exposure to 1 M KNO 3 . The effects of polymer molecular weight and storage conditions on film performance are described. The overall response of this film is comparable to the poly(dimethyldiallylammonium chloride)-silica films previously used for this sensor.

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“…Materials for Selective Films. Coincident with our work on sensor design, we have developed two new series of chemically-selective optical materials (21)(22)(23)(24)(25). These new materials are essential to the functioning of our new spectroelectrochemical sensors.…”

Section: +mentioning

confidence: 99%

Design and Development of a New Hybrid Spectroelectrochemical Sensor

Heineman¹,

Seliskar²,

Ridgway³

1999

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Progress report RESEARCH OBJECTIVEThe general aim of this project is to design and implement a new sensor technology that offers the unprecedented levels of specificity needed for analysis of the complex chemical mixtures found at USDOE sites nationwide. The new sensor concept combines the elements of electrochemistry, spectroscopy and selective partitioning into a single device that provides three levels of selectivity. We have had three major goals:• Demonstration of the general sensor concept on seven model systems • Development of a prototype sensor for ferrocyanide with associated instrumentation • Testing prototype sensor for ferrocyanide on waste tank simulant (U-Plant-2 Simulant Solution) provided by PNNL and then on actual tank waste (Tank 241-C-112) at PNNL/Hanford RESEARCH PROGRESS AND IMPLICATIONSThis report summarizes work during the period 9/15/96 to 9/14/00. The project was funded for three years; the fourth year was a no cost extension. During this time we accomplished the following goals:• Sensor concept demonstrated with an indium tin oxide coated glass guided wave device over-coated with the selective film The implications of this research are as follows:• Combining electrochemistry and spectroscopy in a single device to form a sensor with improved selectivity is feasible.• The spectroelectrochemical sensor concept is applicable to the analysis of complex samples such as are found at DOE sites, as demonstrated by the determination of ferrocyanide in real sample from a Hanford waste tank.• The sensor concept is broadly applicable; sensors for other compounds of interest to DOE could be developed.A no-cost extension of one year was requested to enable us to demonstrate the novel sensor concept for the determination of ferrocyanide on a real sample of tank waste at the Hanford site.To this end, a portable sensor package including a sensor microcell and associated instrumentation was developed and successfully demonstrated on Hanford tank simulant solution at the University of Cincinnati (UC). Based on this success, a UC graduate student, Mike Stegemiller, traveled to Hanford during the period April 1 -8, 2000, to test the sensor on simulant at the Radiochemical Processing Laboratory at PNNL. Working with our collaborator, Dr. Sam Bryan at PNNL, and a technician from PNNL, Mr. Richard Sell, Mr.Stegemiller was able to demonstrate that the sensor worked on their simulant solution. Based on that success, they analyzed a real sample from Tank 241-C-112 for ferrocyanide. The sensor gave a result of 1.0 mM ferrocyanide and the accepted FTIR method gave 0.67 mM. The relatively good agreement between the sensor and the laboratory method attests to the practical utility of this type of sensor for DOE needs. PLANNED ACTIVITIESBecause this grant has ended and the proposed research has been completed, no further experimental work is planned. Submission of manuscripts describing research from this project to scientific journals will continue until all results relating to this project have been published.This n...

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Optically Transparent Polyelectrolyte−Silica Composite Materials: Preparation, Characterization, and Application in Optical Chemical Sensing

Cited by 85 publications

References 50 publications

Characterization of ABTS at a Polymer‐Modified Electrode

Characterization of ABTS at a Polymer‐Modified Electrode

Spectroelectrochemical Sensing Based on Multimode Selectivity Simultaneously Achievable in a Single Device. 19. Preparation and Characterization of Films of Quaternized Poly(4‐vinylpyridine)‐silica

Design and Development of a New Hybrid Spectroelectrochemical Sensor

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