Simple synthesis of nanosheets of rGO and nitrogenated rGO

Abstract

A green and facile approach has been developed for the large-scale synthesis of nanosheets of reduced graphene oxide (rGO) and nitrogenated reduced graphene oxide (N-rGO). This has been achieved by direct thermal decomposition of sucrose and glycine at 475 °C in ca. 7 minutes, respectively. The present protocols for synthesizing rGO and N-rGO are simple and environmentally friendly as we do not use any harmful reagents, metal catalysts and solvents. Along with that, this method offers an inexpensive route with high yields to prepare rGO with a high nitrogen content (20-25 atom %). To further improve the properties of the synthesized rGO sheets, hydrogen treatment has been carried out to reduce the oxygen functional groups. Cyclic voltammograms and charge-discharge experiments have been carried out to understand the supercapacitor behavior of rGO and hydrogen treated (H-rGO) samples. 68

Bifunctional mesoporous CoO/nitrogen‐incorporated graphene electrocatalysts for high‐power and long‐term stability of rechargeable zinc‐air batteries

“…18 The d-spacings of N-rGO and rGO by estimated by Bragg's law are 0.34 and 0.36 nm, respectively ( Figure S5), implying the effect of N atoms on the interlayer distance. 19 In Figure 2B Bulk CoO. Two major peaks were captured, respectively, at 1350 cm −1 for D band and 1580 cm −1 for G band.…”

“…It indicates that the growth of CoO nanocrystals was affected onto the N‐rGO surface in a different manner to the bulk CoO 18 . The d ‐spacings of N‐rGO and rGO by estimated by Bragg's law are 0.34 and 0.36 nm, respectively (Figure S5), implying the effect of N atoms on the interlayer distance 19 . In Figure 2B shows the comparison of the Raman spectrum of CoO/N‐rGO with N‐rGO and Bulk CoO.…”

Bi0–Reduced Graphene Oxide Composites for the Enhanced Capture and Cold Immobilization of Off-Gas Radioactive Iodine

“…The first step is attributed to the evaporation of physically adsorbed water molecules and decomposition of the rGO carbon network (4.04%), as indicated by the m / z = 18 and 44 signals in the mass spectrum measured in the range of 42–500 °C. Meanwhile, the subsequent mass loss in the range of 500–700 °C is assigned to the thermal degradation of rGO (1.30%), which is shown in Figure S9 (TG–MS and DTG curves of rGO) . After iodine capture by the Bi 0 –rGO matrix (Figure b), the results of a trapping iodine test did not indicate the presence of water because the test was conducted at a temperature of 200 °C, which was too high for water sorption.…”

A Flexible and Wearable Nylon Fiber Sensor Modified by Reduced Graphene Oxide and ZnO Quantum Dots for Wide-Range NO2 Gas Detection at Room Temperature

“…Raman spectra of rGO and rGO/ZnO-5 nylon fibers are shown in Figure 4 c. The D and G peaks of rGO appear around 1343 cm −1 and 1595 cm −1 , respectively. D is a defect peak, which represents the defective and disordered structure of the material, while G is generated by the vibration of carbon atoms hybridized by the Sp 2 orbital [ 40 ]. The weak peak at 437 cm −1 is caused by ZnO [ 41 ].…”