High-performance self-assembled graphene hydrogels prepared by chemical reduction of graphene oxide

Graphene/poly(3,4-ethylenedioxythiophene) hydrogel with excellent mechanical performance and high conductivity

“…For both of the samples, the G 0 value was almost one order of magnitude larger than its G 00 value over the whole tested angular frequencies (0.1-100 rad/s), indicating an elastic rather than viscous response of the hydrogels under the small-deformation oscillation and that these hydrogels have a permanent network [9]. The G 0 value of EGP3 hydrogel at 10 rad/s was 2.1 MPa, which was 1 and 2 orders magnitude higher than GP1 hydrogel and any graphene-based hydrogels reported elsewhere [20,21,42], agreeing well with our stressstrain measurement and conforming again that PEDOT made a great contribution to the mechanical strength of the hydrogel.…”

“…Since the first report about the gelation of reduced graphene oxide by Li et al [8], constructing graphene into a three dimensional (3D) structure has been recognized as one of the most effective approaches for preparation of novel functional graphene-based materials [9][10][11][12][13][14][15][16]. Accordingly, graphene-based hydrogels have been fabricated by hydrothermal treatment of GO aqueous solution under high pressure [9,17] or self-assembly of GO sheets with the assistance of diverse of reducing agents, such as hydrazine hydrate [18], ascorbic acid/sodium ascorbate [19][20][21], NaHSO 3 [22], hydroiodic acid [23] and horhypophosphorous acid-iodine [24]. However, all these hydrogels were mechanically weak with a typical fracture stress in the range from 20 to 660 kPa and most of them were electrically poor with a conductivity of 10 À3 -10 À2 S/cm, which hinder their applications in fields from electronic devices to soft machine.…”

Aqueous dispersions of reduced graphene oxide and multi wall carbon nanotubes for enhanced glucose oxidase bioelectrode performance

“…When GOx is drop cast directly onto GCE (i.e., no nanomaterial present) no peaks are evident (Figure 6d) which is to be expected as many publications have investigated the relationship between carbon nanomaterials and their capacity to facilitate DET compared to bare electrodes with no nanomaterials [27][55]. attributed to graphene's high capacitance [46]. Its ability to communicate with immobilised enzymes is evident due to the oxidation and reduction peaks, which indicate the oxidation of GOx (FAD) to GOx (FADH 2 ) and its subsequent reduction (equation 2).…”

Three dimensional reduced graphene hydrogels with tunable pore sizes using thiourea dioxide for electrode materials in supercapacitors

“…The methods to prepare reduced graphene hydrogels or aerogels generally includes hydrothermal reduction, hydrothermal combined with chemical reduction, chemical reduction, N-doped hydrothermal reduction, solvothermal reduction, electrochemical reduction and so on [2], in which chemical reduction by using various reducing agents such as vitamin C [14][15][16][17][18][19], amino acids [20], pyrrole [21][22][23], phenylenediamine [24], hydroquinone [25], dopamine [26][27], natural phenolic acids [28], urea [29][30], HI [31][32], NaHSO 3 [33], N 2 H 4 [34][35], mercaptoacetic acid [36], Fe 2+ [37], thiocarbohydrazide [38] has been attracted more and more attention in recent years because of its simple, facile and convenient properties.…”