Development of intelligent devices (electronic noses and tongues) using electroche...
| Full text | |
| Author(s): |
Cavallari, Marco R.
;
Braga, Guilherme S.
;
da Silva, Mauro F. P.
;
Izquierdo, Jose E. E.
;
Paterno, Leonardo G.
;
Dirani, Ely A. T.
;
Kymissis, Ioannis
;
Fonseca, Fernando J.
Total Authors: 8
|
| Document type: | Journal article |
| Source: | IEEE SENSORS JOURNAL; v. 17, n. 7, p. 1971-1980, APR 1 2017. |
| Web of Science Citations: | 9 |
| Abstract | |
In this contribution, the selectivity toward a diabetes biomarker was demonstrated by a non-specific impedance-metric chemical sensor array from blends of graphene oxide (GO)-based materials as a multivariate system for simultaneous aqueous and gaseous analyte investigation. The electrical impedance of bare graphene either oxidized or after reduction (RGO) displayed high specificity toward ammonia. The sensitivity of GO thin-film capacitance was 10.4 %/ppm of ammonia dissolved in ultrapure water, whereas RGO resistance featured 1.8 %/ppm to gaseous ammonia. However, composites with metal oxides, despite even providing a superior sensitivity to ammonia, completely alter the sign of sensor response to enable distinction of alcohols. Ceria and cyclodextrin allowed GO to operate in air at room temperature with improved stability and a faster response of approximately 60 s. These materials made for an increase in sensitivity to acetone of 11 and 3.2 times, respectively, compared to RGO. Therefore, GO-based composites, as well as the junction of electronic nose and tongue arrays were fundamental to enable the separation of acetone from alcohols and ammonia after principal component analysis. (AU) | |
| FAPESP's process: | 13/19420-0 - Gas sensors from organic thin-film transistors |
| Grantee: | Marco Roberto Cavallari |
| Support type: | Scholarships in Brazil - Post-Doctorate |
| FAPESP's process: | 11/17184-1 - Study and development of chemical sensors for non-invasive diseases diagnosis in human beings |
| Grantee: | Ely Antonio Tadeu Dirani |
| Support type: | Regular Research Grants |
| FAPESP's process: | 13/19421-6 - Development of molecularly imprinted polymers based sensors to detect MIB and GEO at urban supply water |
| Grantee: | Guilherme de Souza Braga |
| Support type: | Scholarships in Brazil - Post-Doctorate |
| FAPESP's process: | 08/57706-4 - National Institute of Science and Technology on Organic Electronics (INEO) |
| Grantee: | Roberto Mendonça Faria |
| Support type: | Research Projects - Thematic Grants |
| FAPESP's process: | 09/05589-7 - Study and develoment of organic LEDs, solar cells, thin-film transistors and sensors based on semiconductor polymers |
| Grantee: | Adnei Melges de Andrade |
| Support type: | Regular Research Grants |
| FAPESP's process: | 15/08566-9 - Gas sensors from organic thin-film transistors |
| Grantee: | Marco Roberto Cavallari |
| Support type: | Scholarships abroad - Research Internship - Post-doctor |