Synthesis and Characterization of Tungsten-metal-organic Framework/Pyrrole-reduced Graphene Oxide

Reduced graphene oxide (rGO) is well-known mesoporous microstructure nanocomposite for its large surface area, high effective permittivity and electron mobility, and strong adsorption capability. Tungsten-metal-organic framework on the other hand acts like the metal center to hold the graphene together. The unique bonding properties of both tungsten and rGO from the oxygen-functional groups such as carboxyl, carbonyl and hydroxyl groups could help in gas detection. This work reports on the characterization of tungsten-metal-organic framework/reduced graphene oxide (W-MOF/rGO). W-MOF/py-rGO has been well-synthesized, morphology and surface analyzed by HRTEM and fully characterized with Raman, FTIR, and XPS spectroscopy. The red shifting in Raman spectra shows that the presence of auxochrome effect upon addition of tungsten ethoxide nanocomposites. W-MOF/py-rGO is proven to have higher surface area than py-rGO due to the formation of nano-sized layer, micro-sized pores and wrinkles. The decrement of C=O carboxyl transmittance peak in FTIR implies that there is an interaction occurred between tungsten ethoxide and py-rGO. Interestingly, in XPS spectra, two pair of doublets are observed represent W 4f for W6+ and W5+ oxidation state. The synthesized W-MOF/py-rGO material revealed the suitable properties which leads to the high potential of being the sensing element such as micro to nano-sized material that promises high surface area, the presence of oxygen-functional groups and the interaction between tungsten ethoxide and py-rGO in form of MOF structures that enhances adsorption sites for better sensing performance. © 2023 American Institute of Physics Inc.. All rights reserved.