POLYANILINE-SILICON HETEROJUNCTIONS AS A SENSING DEVICE
WALTER M. AZEVEDO
Departamento de Química Fundamental, CCEN, Universidade Federal de Pernambuco, Cidade Universitária, 50670-901 Recife, PE, Brazil.
Presented by GILBERTO F. DESÁ
Increasing concern with environmental and personal protection together with widespread requirements for more accurate process control has created a need for new or improved sensors for measuring both physical and chemical parameters. This need for better sensors is strongly influenced by the increasing use of intelligent microelectronics for monitoring and control.
Among several sensing devices developed for a wide range of gases, from organic or inorganic pollutants which must be measured at parts per millions level or lower, the conducting polymer or more specifically polyaniline have been considered as a prominent new materials for the development of chemical sensors. The very great interest for these polymers is the relative ease of syntheses by chemical or electrochemical oxidative polymerizations of the monomers, and by the fact that the p-conjugated polymer behaves as a synthetic metal when simultaneously is in the doped and oxidized state. The combination of these two doping processes allows one to develop a material with interesting electronic, electrochemical, magnetic or optical properties.
In the last decade our group has been concentrated with the development of new synthetic routes to prepare conducting polymer to improve its solubility and processability, also we have been involved with the development of sensor for glucose (1-2), ammonia (3), salinity measurements (4), radiation detection (5) using polyaniline as a active support. In this meeting we will present the recent development of semiconductor-polymer heterojunction to be applied as a gamma radiation detection and as a gas-sensing device. (May 24, 2002).
Publication Dates
-
Publication in this collection
09 Oct 2002 -
Date of issue
Sept 2002
