Accession Number : ADA193489

Title :   An Electrochemical and UV-Visible Spectroelectrochemical Investigation of Selectivity of Potentiometric Gas Sensors Based on Polypyrrole.

Descriptive Note : Technical rept.,

Corporate Author : UTAH UNIV SALT LAKE CITY DEPT OF CHEMISTRY

Personal Author(s) : Pons, Stanley ; Ashley, Kevin ; Janata, Jiri ; Josowicz, Mira

PDF Url : ADA193489

Report Date : 30 Jul 1986

Pagination or Media Count : 31

Abstract : It has been shown in previously that a suspended gate field transistor (SGFET) can be used as a general device for sensing of gases and dielectric fluids. The principles of operation of this device is based on chemical modification of the electron work function of a chemically selective layer which is electrochemically deposited within the gate structure of the device. Electropolymerized polypyrrole (PP), one such layer, can be used as a general matrix into which other chemical functionalities can be incorporated in order to change its selectivity. It has been shown that other organic compounds can be incorporated electrochemically into the bulk of the PP film or that its surface can be covalently modified. Furthermore, PP forms an ohmic junction at noble metal electrodes which is important for the proper operation of the device. In this paper we shall describe the correlation between the spectroelectrochemical characteristics of various types of layers based on PP with their sensitivity and selectivity to some aromatic and hydrogen bonding compounds that interact with the film by hydrogen bonding oar through aromatic systems.

Descriptors :   *GAS DETECTORS, *PYRROLES, *ELECTROCHEMISTRY, *FIELD EFFECT TRANSISTORS, *POLYMERIC FILMS, AROMATIC COMPOUNDS, CHEMICAL PROPERTIES, DIELECTRICS, ELECTRODES, ELECTRONS, FILMS, FLUIDS, GASES, GATES(CIRCUITS), HYDROGEN BONDS, HYDROGEN COMPOUNDS, MODIFICATION, OPERATION, ORGANIC COMPOUNDS, POTENTIOMETRIC ANALYSIS, PRECIOUS METALS, WORK FUNCTIONS, SPECTROSCOPY

Subject Categories : Physical Chemistry
      Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE