Synthesis of Polyacetylene-like Modified Graphene Oxide Aerogel and Its Enhanced Electrical Properties

Abstract

A graphene-based or carbon-based aerogel is a three-dimensional (3D) solid material in which the carbon atoms are arranged in a sheet-like nanostructure. In this study, we report the synthesis of low-density polymer-modified aerogel monoliths by 3D macroassemblies of graphene oxide sheets that exhibit significant internal surface areas (982 m2/g) and high electrical conductivity (∼0.1 to 1 × 102 S/cm). Different types of materials were prepared to obtain a single monolithic solid starting from a suspension of single-layer graphene oxide (GO) sheets and a polymer, made from the precursors 4-carboxybenzaldehyde and poly(vinyl alcohol). These materials were used to cross-link the individual sheets by covalent bonds, resulting in wet-gels that were supercritically dried and then, in some cases, thermally reduced to yield graphene aerogel composites. The average densities were approaching 15–20 mg/cm3. This approach allowed for the modulation of the distance between the sheets, pore dimension, surface area, and related properties. This specific GO/polymer ratio has suitable malleability, making it a viable conductive material for use in 3D printing; it also has other properties suitable for energy storage, catalysis, sensing and biosensing applications, bioelectronics, and superconductors.

Ultralight hybrid silica aerogels derived from supramolecular hydrogels self-assembled from insoluble nano building blocks

“…The nearly 100% yield, which is a superior aspect for aerogel prepared by ISNBBs. In contrast, GO aerogels that were crosslinked by p-p stacking via reduction of GO, 55,56 or crosslinked by soluble polymers such as PVA, PEO, and PVP, [46][47][48][49] were remarkably shrunk during both the solvent-exchange and drying processes.…”

“…Moreover, GOs can be selfassembled between themselves via p-p stacking through reduction, and their corresponding hydrogels can be successfully transferred to GO aerogels, which showed potential applications in energy storage and water purication. [46][47][48][49] Hybrid GO based hydrogels and aerogels incorporated with other insoluble nano building blocks (ISNBBs), such as MoS 2 , carbon nanotubes (CNTs), and boron nitride (BN), [50][51][52][53][54] have been synthesized and they showed improved performances. Nevertheless, these ISNBBs did not act as cross-linkers for the GO to form supramolecular hydrogels, they acted as llers that were embed in the GO matrix.…”

Integration of Different Graphene Nanostructures with PDMS to Form Wearable Sensors

“…In recent times, conductive polymers have been used to lower the manufacturing cost of the thin films and minimize the limitations of the nanocomposite-based electrodes. Some of the common conductive polymers used to form the flexible sensors are PEDOT: PSS [ 46 , 47 , 48 ], polyaniline (PANI) [ 37 , 49 , 50 ], polyacetylene (PA) [ 51 , 52 , 53 ], and polypyrrole (PPy) [ 54 , 55 , 56 ]. Their conjugation assists in inducing additional functional groups that add material properties to the prototypes.…”

Optimizing the Indoor Air Quality in Historical Buildings: Strategies for Environmental Improvement and Public Health Enhancement

“…Another innovative approach is the use of photocatalytic and electrocatalytic oxidation (PCO and ECO) technologies [ 20 , 21 , 22 ]. With these technologies, a photocatalyst, typically titanium dioxide, is utilized to oxidize organic pollutants in the air, converting them into harmless substances like water and carbon dioxide.…”