| 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: | 15/08566-9 - Gas sensors from organic thin-film transistors |
| Grantee: | Marco Roberto Cavallari |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |
| 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 Opportunities: | Scholarships in Brazil - Post-Doctoral |
| FAPESP's process: | 13/19420-0 - Gas sensors from organic thin-film transistors |
| Grantee: | Marco Roberto Cavallari |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |
| 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 Opportunities: | Regular Research 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 Opportunities: | Regular Research Grants |
| FAPESP's process: | 08/57706-4 - National Institute of Science and Technology on Organic Electronics (INEO) |
| Grantee: | Roberto Mendonça Faria |
| Support Opportunities: | Research Projects - Thematic Grants |