Chemical and Temperature Sensors Based on Functionalized Reduced Graphene Oxide

In this work, we investigated the functionalization of reduced graphene oxide (rGO) with 2-(dodecen-1-yl) succinic anhydride (TPSA) to increase the rGO effective interactions with organic solvents both in liquid and vapor phases. Thermogravimetric analysis, STEM, XPS, FTIR-ATR, and Raman spectroscop...

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Bibliographic Details
Published in:Chemosensors 2020-06, Vol.8 (2), p.43
Main Authors: Araya-Hermosilla, Esteban, Minichino, Matteo, Mattoli, Virgilio, Pucci, Andrea
Format: Article
Language:English
Subjects:
chemical and temperature sensor
Chemical sensors
covalent functionalization
Dispersions
Electric properties
Electrical resistance
Electrical resistivity
Electrodes
Graphene
Graphite
Metals
Photovoltaic cells
Raman spectroscopy
reduced graphene oxide
Solvents
Spectrum analysis
Temperature sensors
Thermogravimetric analysis
Transmission electron microscopy
Vapor phases
Vapors
X ray photoelectron spectroscopy
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Summary:In this work, we investigated the functionalization of reduced graphene oxide (rGO) with 2-(dodecen-1-yl) succinic anhydride (TPSA) to increase the rGO effective interactions with organic solvents both in liquid and vapor phases. Thermogravimetric analysis, STEM, XPS, FTIR-ATR, and Raman spectroscopy confirmed the effective functionalization of rGO with about the 30 wt% of grafted TPSA without affecting the structural characteristics of graphene but successfully enhancing its dispersibility in the selected solvent except for the apolar hexane. Solid TPSA-rGO dispersions displayed a reproducible semiconducting (activated) electrical transport with decreased resistance when heated from 20 °C to 60 °C and with a negative temperature coefficient of 10−3 K−1, i.e., comparable in absolute value with temperature coefficient in metals. It is worth noting that the same solid dispersions showed electrical resistance variation upon exposure to vapors with a detection limit in the order of 10 ppm and sensitivity α of about 10−4 ppm−1.
ISSN:2227-9040
2227-9040
DOI:10.3390/chemosensors8020043