Synthesis and Characterization of Multi-Walled Carbon Nanotube/Graphene Nanoplatelet Hybrid Film for Flexible Strain Sensors

Abstract

Graphene nanoplatelet (GNP) and multi-walled carbon nanotube (MWCNT) hybrid films were prepared with the aid of surfactant Triton X-100 and sonication through a vacuum filtration process. The influence of GNP content ranging from 0 to 50 wt.% on the mechanical and electrical properties was investigated using the tensile test and Hall effect measurement, respectively. It showed that the tensile strength of the hybrid film is decreasing with the increase of the GNP content while the electrical conductivity exhibits an opposite trend. The effectiveness of the MWCNT/GNP hybrid film as a strain sensor is presented. The specimen is subjected to a flexural loading, and the electrical resistance measured by a two-point probe method is found to be function of applied strain. Experimental results demonstrate that there are two different linear strain-sensing stages (0–0.2% and 0.2–1%) in the resistance of the hybrid film with applied strain. The strain sensitivity is increasing with the increase of the GNP content. In addition, the repeatability and stability of the strain sensitivity of the hybrid film were conformed through the cyclic loading–unloading tests. The MWCNT/GNP hybrid film shows promising application for strain sensing.

The Effect of TiC Additive on Mechanical and Electrical Properties of Al2O3 Ceramic

“…The electrical resistance of Al 2 O 3 -TiC ceramic composites sintered via SPS was determined by a four-wire Kelvin connection scheme using a separate current source, Keithley 6220, and a two-channel nanovoltmeter, Keithley 2182A (Keithley Instruments, Solon, OH, USA) [47,48]. The four-point set-up comprises four equally spaced tungsten carbide electrodes.…”

Stretchable and compressible strain sensors for gait monitoring constructed using carbon nanotube/graphene composite

“…CNTs are easy to entangle due to the large aspect ratio resulting in low fracture toughness [11] and electrical property of the composites [12]. One of the simple and effective ways to reduce the agglomeration is to incorporate CNTs with graphene to produce a nanocomposite material or a hybrid [13]. Hence, to determine the advantages of novel preparation methods, these nanostructures were used as fillers in this research.…”

Paper-Based Flexible Electrode Using Chemically-Modified Graphene and Functionalized Multiwalled Carbon Nanotube Composites for Electrophysiological Signal Sensing

“…The integration of CG and MWCNTs into a composite material is therefore a quite promising strategy to enhance the dispersion of CG and CNTs, to inherit the advantages of both CG and MWCNTs, and to obtain an efficient and effective electronic and thermal conductive network [26,27]. CG/MWCNT composites have been developed to effectively overcome the limitations of the use of individual materials [28][29][30][31]. MWCNTs can greatly reduce internal electrical resistance and improve overall electrical conductivity, since MWCNTs act as spacers between CG sheets and make interconnected conductive network paths [32].…”

“…MWCNTs can greatly reduce internal electrical resistance and improve overall electrical conductivity, since MWCNTs act as spacers between CG sheets and make interconnected conductive network paths [32]. As non-functionalized MWCNTs are prone to agglomerate due to their large aspect ratio, the MWCNTs and CG composite in solution is not uniform and is not stable for a long time [31,33]. To overcome this issue, functionalized MWCNTs are used to make composites in order to get uniformity and longtime usability.…”