Graphene/Ionic Liquid Composite Films and Ion Exchange

Abstract

Wettability of graphene is adjusted by the formation of various ionic surfaces combining ionic liquid (IL) self-assembly with ion exchange. The functionalized ILs were designed and synthesized with the goal of obtaining adjustable wettability. The wettability of the graphene surface bearing various anions was measured systematically. The effect of solvent systems on ion exchange ratios on the graphene surface has also been investigated. Meanwhile, the mechanical properties of the graphene/IL composite films were investigated on a nanometer scale. The elasticity and adhesion behavior of the thin film was determined with respected to the indentation deformation by colloid probe nanoindentation method. The results indicate that anions played an important role in determining graphene/IL composite film properties. In addition, surface wetting and mechanics can be quantitatively determined according to the counter-anions on the surface. This study might suggest an alternate way for quantity detection of surface ions by surface force.

The Influence of the Interlayer Distance on the Performance of Thermally Reduced Graphene Oxide Supercapacitors

“…With the increase of RC, it takes more time to reach the steady state and hence collapses the rectangular profile. In addition, increasing the scan rate means reducing the response time and that would also cause similar results to those observed in Figure 8 a–c [ 28 , 29 ]. Based on the shape of the CV curve, the TRG should have the highest R among these samples which is consistent with the previous EIS conclusion.…”

Boosting the power performance of multilayer graphene as lithium-ion battery anode via unconventional doping with in-situ formed Fe nanoparticles

“…The multilayer graphene is stable, in oxygen, up to 450 °C, however, a loss is observable between 460 °C and 670 °C. At 1000 °C, MUG shows a weight loss of about 91.15%, which is consistent with the results obtained from the CHNS elemental analysis ( Table 1 ) 54 55 . The weight loss of MUG is not 100% because of the synthetic process applied.…”

Ultrathin ionic liquid films on metal surfaces: adsorption, growth, stability and exchange phenomena

“…A good wettability of the IL film is a crucial requirement for the performance of IL/catalyst composite systems [11,57]. While wetting of ILs has been studied quite extensively on the macroscopic and mesoscopic scale, mostly by contact angle measurements and atomic force microscopy (AFM) [10,57,[100][101][102][103][104][105][106][107][108][109][110][111][112][113], only a few studies are available on the molecular scale [10,69,71,73,74,76,78,86,87,91,[114][115][116][117][118].…”