Direct reduction of graphene oxide films into highly conductive and flexible graphene films by hydrohalic acids

An asymmetric electrically conducting self-aligned graphene/polymer composite thin film for efficient electromagnetic interference shielding

“…Then, reduction process was carried out by immersing the composite film into HI solution in a sealed cuvette and placed the cuvette in warm oil bath at 80 • C for 2 h. The reduction mechanism for GO to rGO using HI acid has been reported elsewhere. 33 The reduced composite film (black) was washed by water several times to remove the excessive HI, yielded a highly aligned but asymmetric and flexible film as shown in Figure 1d. Inset of Figure 1d shows flexibility of the composite film.…”

Graphene oxide adsorption enhanced by in situ reduction with sodium hydrosulfite to remove acridine orange from aqueous solution

“…However, to date, chemically derived graphene oxide (GO) from graphite has revealed a variety of potential uses because of its flexibility and relatively cheap fabrication. Like a graphene precursor, a subsequent GO reduction could restore the sp 2 carbon structure via various methods such as annealing [4], solvothermal/hydrothermal processes [5][6][7], or different kinds of reductants [8][9][10][11][12][13][14][15]. However, compared to mechanical exfoliation, functionalities (as defects) can be meanwhile imperfectly introduced onto graphene sheet surfaces.…”

“…However, compared to mechanical exfoliation, functionalities (as defects) can be meanwhile imperfectly introduced onto graphene sheet surfaces. On the other hand, an oxygenation/reduction process confers on GO features that not only are relevant for applications in electrochemistry, such as hybrid materials [16], ultra-capacitors [3,17], transparent/conducting film [10,15,[18][19][20][21], battery electrodes [22], and sensors [23][24][25], but that also carry potential in the bioengineering arena. Hu et al reported that graphene-based 4 materials, i.e., GO or reduced GO paper, showed an excellent inhibitory effect on bacterial growth with mild cytotoxicity [26].…”

Fully Solution-Processed Semitransparent Organic Solar Cells with a Silver Nanowire Cathode and a Conducting Polymer Anode

“…1 ITO, however, suffers from several drawbacks that limit its viability as a TCE for next-generation optoelectronics, including high cost, poor performance on plastic substrates, and a tendency to crack when flexed. 2,3 Potential solution-processable alternatives to ITO include carbon nanotubes, 4,5 graphene, [6][7][8][9] conducting polymers, 10,11 and metal nanowires [12][13][14][15] Single-Walled Carbon Nanotubes (SWCNTs) are attractive TCE materials due to their high intrinsic conductivity and mechanical durability but, owing to large inter-tube resistances, their reported performance characteristics are significantly worse than ITO. The need for aggressive acid treatments to induce p-type doping of semiconducting tubes and the non-permanent nature of the doped state are also problematic.…”

“…9 The fabrication procedure however involved a combination of chemical vapour deposition (CVD), chemical etching, and solid-state transfer, and is unlikely to transfer easily to large-scale industrial use. Graphene TCEs may alternatively be prepared from a dispersion of graphene oxide, 6,7 which can be cast onto a substrate and then reduced to render it conductive. The reduction step, however, requires high temperatures and/or harsh reagents such as hydrazine and is consequently ill-suited to direct deposition on plastic substrates.…”