New spectroelectrochemical sensor

A new type of spectroelectrochemical sensor that embodies tow modes of instrumental selectivity in addition to selective partitioning through an applied film barrier is described. The sensor consists of a planar optical substrate/electrode coated with a chemically-selective film. SEnsing is based on the change in the attenuation of light passing through the guided wave substrate which accompanies a chemical reaction of an analyte induced by electromodulation. Threefold selectivity for a chosen analyte relative to other environmental components is obtained by the choice of coating material, the electrolysis potential, and the wavelength for optical monitoring. The sensor concept is demonstrated with an indium tin oxide coated glass guided wave device that has been over-coated with a sol-gel derive charge-selective thin film. One such selective coating used was a charge-selective sol-gel processed Nafion-SiO2 composite film. Prototype analytes have been used to demonstrate that the change in the transmittance of the waveguide resulting from electrochemical oxidation/reduction can be used to quantify an analyte.

[1]  Theodore Kuwana,et al.  Internal Reflection Spectroscopic Observation of Electrode-Solution Interface , 1966 .

[2]  I. Garcés,et al.  Four-layer chemical fibre optic plasmon-based sensor , 1992 .

[3]  S Kawata,et al.  Surface-plasmon sensor for absorption-sensitivity enhancement. , 1994, Applied optics.

[4]  James S. Wilkinson,et al.  An optoelectrochemical thin-film chlorine sensor employing evanescent fields on planar optical waveguides , 1992 .

[5]  Theodore Kuwana,et al.  Preparation and properties of thin gold and platinum films on glass or quartz for transparent electrodes , 1970 .

[6]  N. F. Sheppard.  Biosensor principles and applications. , 1992, Bioprocess technology.

[7]  Harry B. Mark,et al.  Simultaneous electrochemical and internal-reflection spectrometric measurements using gold-film electrodes , 1968 .

[8]  W. Lukosz,et al.  Principles and sensitivities of integrated optical and surface plasmon sensors for direct affinity sensing and immunosensing , 1991 .

[9]  Kyle S. Johnston,et al.  Novel surface-plasmon-resonance-based fiber optic sensor applied to biochemical sensing , 1993, Photonics West - Lasers and Applications in Science and Engineering.

[10]  G. W. Ford,et al.  Optical electric-field enhancement at a metal surface arising from surface-plasmon excitation. , 1981, Optics letters.

[11]  Theodore Kuwana,et al.  Observation of electrode-solution interface by means of internal reflection spectrometry , 1966 .

[12]  Theodore Kuwana,et al.  Electrochemical Studies Using Conducting Glass Indicator Electrodes. , 1964 .

[13]  H Gunasingham,et al.  Electrochemically modulated optrode for glucose. , 1992, Biosensors & bioelectronics.

[14]  Jan Greve,et al.  Surface plasmon resonance immunosensors: sensitivity considerations , 1988 .

[15]  Wilford N. Hansen,et al.  Electromodulation of the Optical Properties of Gold , 1968 .

[16]  Lin Yang,et al.  Chemical Sensing Using Sol-Gel Derived Planar Waveguides and Indicator Phases , 1995 .

[17]  Jay W. Grate,et al.  Acoustic Wave Microsensors PART II , 1993 .

[18]  S. Yee,et al.  Control of the dynamic range and sensitivity of a surface plasmon resonance based fiber optic sensor , 1994 .

[19]  J. Attridge,et al.  Sensitivity enhancement of optical immunosensors by the use of a surface plasmon resonance fluoroimmunoassay. , 1991, Biosensors & bioelectronics.

[20]  Robert E. Benner,et al.  Angular emission profiles of dye molecules excited by surface plasmon waves at a metal surface , 1979 .

[21]  S. Yee,et al.  A fiber-optic chemical sensor based on surface plasmon resonance , 1993 .