A carbon aerogel with super mechanical and sensing performances for wearable piezoresistive sensors

Abstract

A compressible carbon aerogel with not only super mechanical performances but also ultrahigh linear sensitivity is fabricated from MXene nanosheets and cellulose nanocrystals (CNCs).

Flexible conductive Ag nanowire/cellulose nanofibril hybrid nanopaper for strain and temperature sensing applications

“…The inexhaustibility, low cost and large availability of cellulose make its large-scale use possible. Besides, the amphiphilic property of cellulose could effectively avoid its aggregation, i.e., achieving homogeneous dispersion [27,[32][33][34]. Hence, cellulose based composites have been widely investigated in the fields of thermal conductivity [35], electromagnetic interfaces shielding [36,37], oil/water separation [38] and sensor [39].…”

Enhancing the conductivity, stability and flexibility of Ti3C2Tx MXenes by regulating etching conditions

“…For instance, O terminated MXenes are predicted to exhibit a higher electrocatalytic activity in hydrogen evolution reaction (HER) and a higher capacity in lithium-ion and other batteries than F-terminated MXenes [26], while the later ones are more suitable for nanogenerators due to the large electronegativity of the F atoms [27]. In terms of the requirements of morphology, for example, MXenes with small lateral size are intended to be employed in photothermal therapy and photocatalysis while the large-size flakes are more suitable for constructing three-dimensional (3D) architectures, like aerogel and the products of 3D printing, which are usually applied in electromagnetic shielding, wearable electronics and so on [11,[28][29][30][31]. Therefore, regulating the morphologies and surface termination for specific applications is of great importance.…”

Versatile Aerogels for Sensors

“…Theoretically, all the electrically conductive aerogels can be used as piezoresistive strain and pressure sensors, so the aerogels based on other electrical conductive materials for this kind of sensor applications are also reported . The ultralight PPy aerogels with a relatively good compressibility, high electrical conductivity ( Figure a), and highly porous structure (Figure b) indicated the great potential for the strain and pressure sensor .…”

“…The introduction of PVA can further improve the mechanical properties of the Cu aerogels, especially Cu/PVA aerogel obtained from the oriented freeze‐casting showed higher elastic strength and lesser plastic deformation when compared to the Cu aerogel, thus endowing a high cycling stability for the strain and pressure sensor . The CNCs were used to connect and avoid the aggregation of the MXene nanosheets to form MXene/CNC aerogel . Finally, the MXene/carbon aerogel could be obtained by the thermal pyrolysis, and showed high compression strain of 95% and long‐term compression over 10 000 cycles.…”