A Bubble‐Derived Strategy to Prepare Multiple Graphene‐Based Porous Materials

Abstract

Graphene-based porous structures have triggered tremendous attention due to their promising application in many fields. Recent progress has yielded structures with stochastic porous networks, which limit their controllability and potential performance. It still remains a big challenge for the scalable production to integrate the 2D building block into engineered porous architectures in multidimensions. Here, a versatile technique based on soft bubble templating and fixation by freezing is described to fabricate 3D bubble-derived graphene foams (BGFs) and 2D bubble-derived graphene porous membranes (BGPMs). These light-weight novel structures are carefully tuned. The BGFs show high adsorption capabilities for organic solvents and good recovery in structural deformation. Furthermore, applications of BGFs and BGPMs in strain sensors for wearable devices are discussed, working as a combined system which can both detect the compressive and tensile deformation. This technique can be extended to assemble other nanomaterials as building blocks into macroscopic configurations.

Highly Ordered 3D Porous Graphene Sponge for Wearable Piezoresistive Pressure Sensor Applications

“…There has been a focus on 3D graphene structures for application as high‐performance pressure sensors in the past few years. However, most studies have focused on preparation of the materials and pressure‐resistance testing; fabrication of a device‐level flexible pressure sensor for application in motion detection has rarely been reported . Herein, highly ordered 3D OPGSs were designed and the porous structure of OPGSs was optimized for electrical piezoresistive properties.…”

“…However,m ost studies have focusedo np reparation of the materials and pressure-resistance testing;f abrication of a device-level flexible pressure sensorf or application in motion detection has rarely been reported. [14,48,50,51] Herein, highly ordered 3D OPGSs wered esigned andt he porous structure of OPGSs was optimized fore lectrical piezoresistive properties. To achieveawearable pressure-sensor device, the packaging of a sensor is indispensable for reliability.I nt his case, the fabrication process for the wearable pressure sensor based on OPGSs was optimized.…”

Highly Stretchable, Adaptable, and Durable Strain Sensing Based on a Bioinspired Dynamically Cross‐Linked Graphene/Polymer Composite

“…Moreover, the curves were symmetrical, indicating that the resistance recovered as quickly as in the loading process. The results also showed the same maximum resistance variation under different frequencies, thus demonstrating excellent independence of the sensor on the test frequency …”

Biomass‐Derived Porous Carbon Prepared from Egg White for High‐performance Supercapacitor Electrode Materials

“…As shown in Figure b, the G band at around 1600 cm −1 is related to the E 2g in‐plane vibrational mode of sp 2 ‐bonded carbon and the D band is at about 1345 cm −1 that is assigned to K‐point phonons of A 1g symmetry . The intensity ratio of D and G bands (I D /I G ) can reflect the amount of defects in the graphitic structure . Table shows that the maximum value of I D /I G is about 0.992 for EWC‐2, which demonstrates more disordered structure and more produced defects.…”

“…[41] The intensity ratio of D and G bands (I D /I G ) can reflect the amount of defects in the graphitic structure. [51] Table 1 shows that the maximum value of I D /I G is about 0.992 for EWC-2, which demonstrates more disordered structure and more produced defects.…”