Organic fragments from graphene oxide: Isolation, characterization and solvent effects

Abstract

As-prepared graphene oxide (GO) contains oxidative debris which can be washed using basic solutions. We present the isolation and characterization of these debris. Dynamic light scattering (DLS) is used to monitor the separation of the debris in various solvents in the presence of different protic and aprotic alkylamino bases. The study reveals that the debris are rich in carbonyl functional groups and water is an essential component for separation and removal of the debris from GO under oxidative reaction conditions.

Near-Infrared Light-, Magneto-, and pH-Responsive GO–Fe3O4/Poly(N-isopropylacrylamide)/alginate Nanocomposite Hydrogel Microcapsules for Controlled Drug Release

“…Figure shows the characterization of the prepared GO–Fe 3 O 4 nanomaterials. As displayed in Figure a, the size of GO–Fe 3 O 4 nanomaterials is determined by DLS, which is consistent with previous literature studies . The morphology of obtained nanomaterials was investigated by using a transmission electron microscope (Figure S1).…”

“…As displayed in Figure 2a, the size of GO−Fe 3 O 4 nanomaterials is determined by DLS, which is consistent with previous literature studies. 44 The morphology of obtained nanomaterials was investigated by using a transmission electron microscope (Figure S1). The GO nanosheets are decorated with abundant Fe 3 O 4 nanoparticles, which are nearly spherical in shape and uniform in size.…”

Comparative Characterization of Peanut β-Amylase Immobilization onto Graphene Oxide and Graphene Oxide Carbon Nanotubes by Solid-State NMR

“…The difference between GO nanosheets and GO–CNT 13 C spectra is due to the packing arrangement of graphene oxide in these two materials, which has arisen due to different methods of preparation . Sharp peaks in the 13 C spectrum for functionalized GO–CNT in the native state were obtained around 30, 70, and 175 ppm, which are not very different from that of the chemical shifts reported for graphite oxide in previous studies. ,− These changes in chemical shifts are attributed to the structure of GO–CNT and functionalization of GO with l -cystine during preparation of material for immobilization, which is more clear in the spectra for GO–CNT than that of GO nanosheets. In addition, the peaks are different from 1D CNT as well. , The natural abundance 13 C spectrum for immobilized β-amylase cross-linked by glutaraldehyde on functionalized GO–CNT showed resonance peaks at 24.5 and 61 ppm, two resonances around 70 ppm, and a single peak at 181 ppm.…”

Synthesis and Applications of Graphene Oxide

“…The amount of the oxidation debris is strongly influenced by the reaction time of graphite and concentrated acids [ 26 , 27 ]. To wash away those fragments, a base washing is needed [ 27 , 28 , 29 ]. The pure GO without the oxidation debris presents an oxidation level that is similar to chemically reduced GO [ 30 ].…”