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| Author(s): |
Priscila Pizzolato
Total Authors: 1
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| Document type: | Master's Dissertation |
| Press: | São Carlos. |
| Institution: | Universidade de São Paulo (USP). Instituto de Física de São Carlos (IFSC/BT) |
| Defense date: | 2005-03-28 |
| Examining board members: |
Carlos Manoel Pedro Vaz;
Artur de Jesus Motheo;
Antonio Riul Júnior
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| Advisor: | Carlos Manoel Pedro Vaz |
| Abstract | |
Nowadays the manufacturing of polimeric sensors has been attractingv technological and cientific interests, due to the demand for different sensors in a large number of applications. In this context. Embrapa Agriculturial Instrumentation rias been looking for the development of new technologies, instrumentation and sensor, envisaging environment monitoring, theme of huge global importance. Many products that are in the market in developing countries do not follow the FAO quality standards and their use can cause risks of contamination to soil and water, damaging the acquatic life and consequently the human life. The aim of this project was the preparation. characterization and development of sensing units made by thin layers of conducting polymers, in order to evaluate the water quality mainly due to contamination of pesticides. To achieve these aims, we made use of an \"electronic tongue\" designed with different sensing units in which conductor polymeric films with specific compositions were deposited, in order to have electric responses for each type of pesticide. For that, the following studies were carried out: i) The polymers PANI and POEA were synthesized and characterized ii) these films (PANI, POEA and PEDOT/PSS) were deposited by self-assembly on gold interdigited microelectrodes. The sensibility of these films to different pesticides was evaluated; iii) the interactions between pesticides and polymers were monitored by visible ultraviolet spectroscopic (UV-VIS) and microscopy techiques (SEM); iv) the sensing units were characterized by impedance measurements and by Principal Component Analysis (PCA). Using eight sensing units with PANI, POEA and PEDOT/PSS films it was demonstrated the possibility to detect some pesticides in concentration of 1 µ mL-1 and to distinguish contaminated samples from non contaminated (AU) | |