Synthesis and Characterization of Graphene Oxide Derivatives via Functionalization Reaction with Hexamethylene Diisocyanate

Abstract

Graphene oxide (GO), the oxidized form of graphene, shows unique properties, such as strong mechanical strength, high thermal conductivity, amphiphilicity, and surface functionalization capability that make it very attractive in various fields, ranging from medicine to optoelectronic devices and solar cells. However, its insolubility in non-polar and polar aprotic solvents hinders some applications. To solve this issue, novel functionalization strategies are pursued. In this regard, the current study deals with the preparation and characterization of hexamethylene diisocyanate (HDI)-functionalized GO. Different reaction conditions were tested to optimize the functionalization degree (FD), and detailed characterization was conducted via Fourier-transformed infrared (FT-IR) spectroscopy to confirm the success of the functionalization reaction. The HDI-GO could further react with other organic molecules or polymers via the remaining oxygen groups, which makes them ideal candidates as nanofillers for high-performance GO-based polymer nanocomposites.

Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with Effective Photocatalytic Activity for Wastewater Treatment

“…Observed peak 3433 cm -1 corresponds to O-H stretching vibration [23]. Low transmittance peaks at 1719 cm -1 assign to C = O stretching vibrations caused by COOH groups and the band at 1627 cm −1 assigned to the aromatic C-C stretching [10,33]. Peak at~2371 cm −1 assigned to COO groups [34].…”

Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with effective Photocatalytic Activity for Wastewater Treatment

“…Observed peak ~3433 cm -1 corresponds to O-H stretching vibration [23]. Low transmittance peaks at 1719 cm -1 assign to C=O stretching vibrations caused by COOH groups and the band at 1627 cm -1 assigned to the aromatic C-C stretching [10,33]. Peak at ~2371cm -1 assigned to COO groups [34,35].…”

“…In case of GO, two bands are located at ~1340 and ~1590 cm -1 assigned as D and G band, respectively. The D band is assigned to breathing mode of k-point phonons with A 1g symmetry and band from sp 3 carbon atoms; G band suggests a characteristic peak of sp 2 hybrid structure which reveals symmetry and crystallizability of carbon and introduces E 2g phonon scattering of carbon atoms [32,33,37]. Moreover, D band is evident to surface defects and structural imperfections arise with attached hydroxyl and epoxide functions groups with carbon basal planes [37].…”

Hydrothermal Synthesis of Silver Decorated Reduced Graphene Oxide (rGO) Nanoflakes with effective Photocatalytic Activity for Wastewater Treatment

“…Observed peak ~3433 cm -1 corresponds to O-H stretching vibration [23]. Low transmittance peaks at 1719 cm -1 assign to C=O stretching vibrations caused by COOH groups and the band at 1627 cm -1 assigned to the aromatic C-C stretching [10,33], and peak ~2371cm -1 arises due to CO 2 [34,35]. Transmittance peak (~650 cm -1 ) is a fingerprint region of hybridized sp 2 carbon bonding allotted as C-H bending vibration [36].…”