A Hybrid Electronic Nose and Tongue for the Detection of Ketones: Improved Sensor Orthogonality Using Graphene Oxide-Based Detectors

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...

Full description

Saved in:
Bibliographic Details
Published in:IEEE sensors journal 2017-04, Vol.17 (7), p.1971-1980
Main Authors: 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.
Format: Article
Language:English
Subjects:
Acetone
Alcohols
Ammonia
Biomarkers
Cerium oxides
Chemical sensors
Composite materials
Cyclodextrins
Electrical impedance
electronic nose
Electronic noses
electronic tongue
Graphene
Ketones
Liquids
Metal oxides
Methanol
Orthogonality
Principal components analysis
Room temperature
Sensitivity
Sensor arrays
Sensors
Thin films
Tongue
volatile organic compounds
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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.
ISSN:1530-437X
1558-1748
DOI:10.1109/JSEN.2017.2661067