1D/2D Nanomaterials Synergistic, Compressible, and Response Rapidly 3D Graphene Aerogel for Piezoresistive Sensor

Abstract

Graphene‐based aerogels have been widely studied for their high porosity, good compressibility, and electrical conductivity as piezoresistive sensors. However, the fabrication of graphene aerogel sensors with good mechanical properties and excellent sensing properties simultaneously remains a challenge. Therefore, in this study, a novel nanofiber reinforced graphene aerogel (aPANF/GA) which has a 3D interconnected hierarchical microstructure with surface‐treated PAN nanofiber as a support scaffold throughout the entire graphene network is designed. This 3D interconnected microporous aPANF/GA aerogel combines an excellent compressive stress of 43.50 kPa and a high piezoresistive sensitivity of 28.62 kPa−1 as well as a wide range (0–14 kPa) linear sensitivity. When aPANF/GA is used as a piezoresistive sensor, the compression resilience is excellent, the response time is fast at about 37 ms at 3 Pa, and the structural stability and sensing durability are good after 2600 cycles. Indeed, the current signal value is 91.57% of the initial signal value at 20% compressive strain. Furthermore, the assembled sensors can monitor the real time movement of throat, wrist pulse, fingers, wrist, and knee joints of the human body at good sensitivity. These excellent features enable potential applications in health detection.

Lightweight, Superelastic, and Hydrophobic Polyimide Nanofiber /MXene Composite Aerogel for Wearable Piezoresistive Sensor and Oil/Water Separation Applications

“…[ 26,27 ] Recently, inspired by the ultralight and structurally robust and elastic spider webs, ultralight nanofibril‐assembled aerogels composed of fibrous cell wall has shown great potential for the fabrication of flexible piezoresistive sensors due to their superelasticity and excellent mechanical stability. [ 28,29 ] For example, Xu et al. have fabricated a piezoresistive sensor utilizing polyimide (PI) nanofiber aerogel produced by the freeze‐drying and intermolecular condensation process, which exhibits ultralow density (4.6–13.1 mg cm −3 ), ultrahigh compressibility (99%), negligible plastic deformation, and stable cellular structure over 1000 fatigue cycles at 80% compression strain.…”

Flexible Ceramic Nanofibrous Aerogels with Hierarchically Entangled Graphene Networks Enable Full-Frequency Noise Absorption

“…4c illustrated the invisibility of the GO characteristic peak at about 10.36° in the GCNAs, further suggesting that the GO was successfully reduced to rGO. 36 The basic entangled structure of the exible GCNAs consisted of one-dimensional (1D) exible SNFs wrapped by 2D rGO networks (the enlarged detail of GCNAs in Fig. 1a).…”

Recent advances in novel aerogels through the hybrid aggregation of inorganic nanomaterials and polymeric fibers for thermal insulation

“…Introducing inorganic nanocomponents into nanofibrous aerogels via freeze drying methods: (A) hydrothermal gelation of rGO/alkaline‐treated polyacrylonitrile nanofiber (aPANF) (reprinted with permission [ 99 ] ). (B) Interfacial synthesis of CNF@MOF nanofibrous aerogels (reprinted with permission [ 100 ] ).…”

“…Cao et al. [ 99 ] designed a nanocomposite aerogel that comprises 3D interconnected hierarchical microstructure with the surface‐functionalized PAN nanofiber as the support framework throughout the graphene networks, which shows a highly porosity and excellent compressive stress of 43.5 kPa (Figure 8A). Particularly, due to the high porosity and thermal stability of the MOFs, Zhou et al.…”

“…Reinforcing elasticity of the aerogels with: (A) semi‐interpenetrated networks (reprinted with permission [ 135 ] ) and (B) inorganic fillers (reprinted with permission [ 99 ] )…”