Fast and fully-scalable synthesis of reduced graphene oxide

Abstract

Exfoliation of graphite is a promising approach for large-scale production of graphene. Oxidation of graphite effectively facilitates the exfoliation process, yet necessitates several lengthy washing and reduction processes to convert the exfoliated graphite oxide (graphene oxide, GO) to reduced graphene oxide (RGO). Although filtration, centrifugation and dialysis have been frequently used in the washing stage, none of them is favorable for large-scale production. Here, we report the synthesis of RGO by sonication-assisted oxidation of graphite in a solution of potassium permanganate and concentrated sulfuric acid followed by reduction with ascorbic acid prior to any washing processes. GO loses its hydrophilicity during the reduction stage which facilitates the washing step and reduces the time required for production of RGO. Furthermore, simultaneous oxidation and exfoliation significantly enhance the yield of few-layer GO. We hope this one-pot and fully-scalable protocol paves the road toward out of lab applications of graphene.

The Role of Diamines in the Formation of Graphene Aerogels

“…The G band in some spectra appeared clearly asymmetric due to the contribution of D' band, while both D and G bands in rGO DAB , rGO OPD aerogels are contaminated by signals probably due to the presence of aromatic diamines. The characteristic I D /I G ratio (I D and I G were measured from the peak height after baseline correction) was increased from 0.78 in pure GO to 0.86-1.19, similarly to other rGO products in the literature (Stankovich et al, 2007;Pei and Cheng, 2012;Tang et al, 2014;Abdolhosseinzadeh et al, 2015;Bo et al, 2015;Ji et al, 2017). That change is usually attributed to the decrease of average size of sp 2 domains, together with an increase of the number of those domains after reduction (Stankovich et al, 2007;Pei and Cheng, 2012;Chen et al, 2013;Feng et al, 2013).…”

“…The remaining carbon material was removed by oxidation completely by 500 • C FIGURE 8 | TG analysis of aerogels with aliphatic diamines and GO. (see Figure 8, line 4) (Kuila et al, 2008;Abdolhosseinzadeh et al, 2015).…”

Topological phase in oxidized zigzag stanene nanoribbons

“…Due to the possibility of oxidation of fabricated nano-devices, one needs to address the adsorption of oxygen on two dimensional nanostructures for possible future applications. Graphene oxide [35][36][37][38][39] and silicene oxide 40,44 were investigated theoretically and experimentally before. Motivated by these works, here we present a study of oxygen adsorption on 2D stanene using DFT and tight binding approaches.…”

Effect of plasma power on reduction of printable graphene oxide thin films on flexible substrates

“…However, the yield and efficiency of exfoliation remain low [13]. Sonication-assisted reduction of graphite with ascorbic acid is reported to improve the efficiency and yield, producing a few kilograms of graphene per hour [14]. Wafer-size graphene layers have been epitaxially grown on insulating silicon carbide (SiC (0001)) substrates in an argon environment under atmospheric pressure at room temperature.…”