Chemical and Temperature Sensors Based on Functionalized Reduced Graphene Oxide

Chemosensors

Esteban Araya-Hermosilla¹  Virgilio Mattoli¹  Matteo Minichino²  Andrea Pucci² 

[1] Center for Micro-BioRobotics @SSSA Istituto Italiano di Tecnologia Viale Rinaldo Piaggio 34, 56025 Pontedera, Italy;Department of Chemistry and Industrial Chemistry, University of Pisa, Via Moruzzi 13, 56124 Pisa, Italy;

关键词: graphene;    reduced graphene oxide;    covalent functionalization;    chemical and temperature sensor;   

DOI  :  10.3390/chemosensors8020043

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown