Abstract
A flexible hybrid film consisting of graphene nanoplatelets (GNPs) and multi-walled carbon nanotubes (MWCNTs) was prepared and employed as a multifunctional sensor to monitor temperature and liquid leakage, based on the piezoresistive effect. The influences of the GNP content on the mechanical, thermal, and sensing properties were investigated. Experimental results showed that both the hardness and Young’s modulus of the hybrid film were decreased with an increasing GNP content, while the thermal conductivity exhibited in an opposite trend. The electrical resistance of the hybrid film decreased was linearly with an increase in temperature. The resistance change increased linearly with an increase of the solvent adsorption. These features demonstrated the potential applications of the hybrid film in the detection of temperature, and liquid leakage. The sensitivity of leakage detection is increasing with the increase of the GNP loading, while temperature sensitivity is in the opposite trend.
Highlights
Carbon-based nanomaterials, including carbon nanotube (CNT) and graphene, have received increasing attention, owing to their excellent thermal, mechanical, chemical, and electrical properties [1,2]
The temperature sensitivity of the hybrid film decreased with the increase of the graphene nanoplatelets (GNPs) content [37,38]
Surface and cross-view SEM images showed that multi-walled carbon nanotubes (MWCNTs) and GNPs assembled to form a densely packed film, with a “sandwich”-like structure
Summary
Carbon-based nanomaterials, including carbon nanotube (CNT) and graphene, have received increasing attention, owing to their excellent thermal, mechanical, chemical, and electrical properties [1,2]. Thin film or paper-like composite materials, consisting of multi-walled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs), exhibit high electrical and thermal conductivities [3], extraordinary structural flexibility, excellent mechanical properties [4], and a porous structure, with a high specific surface area [5] Such hybrid films have the potential for application in strain sensors [6], batteries [7], gas or solvent sensors [8,9], flexible temperature sensors [10], and electromagnetic shielding [11]. (diallylimethyammonium chloride) (PDDA) nanocomposite film sensor with high-performance utilized lignosulfonate (LS)etas moisture sensing andsensor reduced oxide (rGO) as humidity properties. To investigate the MWCNT/GNP hybridimprove films to their further improve for their properties for potential applications
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