One-Step Synthesis of Graphene Oxide–Polyamidoamine Dendrimer Nanocomposite Hydrogels by Self-Assembly

Abstract

Graphene oxide (GO)-polyamidoamine (PAMAM) dendrimer nanocomposite hydrogels were prepared through one-step synthesis by mixing a GO suspension and a PAMAM solution at varying ratio of GO to PAMAM. The materials self-assembled into physically crosslinked networks, mainly driven by electrostatic interactions between the oppositely charged GO nanosheets and PAMAM dendrimer. The chemical structure of PAMAM dendrimer was studied by mass spectrometry, nuclear magnetic resonance spectroscopy and potentiometric titration.The structure and properties of GO-PAMAM nanocomposite hydrogels were investigated by Fourier transform infrared spectroscopy, Raman spectroscopy, X-ray diffraction, scanning electron microscopy and rheometry. The nanocomposite hydrogels exhibited a relatively high mechanical performance with a storage modulus of up to 284 kPa, as well as self-healing property, owing to their reversible and multiple physical cross-links. These hydrogels may be further developed for biomedical applications.2

Optical Studies of Graphene Oxide/Poly(amidoamine) Dendrimer Composite Thin Film and Its Potential for Sensing Hg2+ Using Surface Plasmon Resonance Spectroscopy

“…Then, GO/PAMAM solution was produced by one-step self-assembly. (29) 0.5 mL of PAMAM water solution was added dropwise into 5.5 mL of GO solution with stirring for about 30 s to obtain the GO/PAMAM solution. Subsequently, a mercury standard solution with a concentration of 1000 ppm was diluted using the dilution formula M 1 V 1 = M 2 V 2 to produce Hg 2+ solutions with concentrations of 0.5, 1, 5, 10, 20, 40, 60, 80, and 100 ppm.…”

“…The GO spectrum depicts characteristic absorption bands at 3313.43 and 1432.82 cm −1 , which are attributed to the O-H group from the carboxyl group. (29,37) Furthermore, the weaker band at 2895.71 cm −1 is attributed to the presence of the carboxylic acid COOH. (38) Next, the bands at 1122.75 and 1661.52 cm −1 correspond to the C-O stretching vibrations of the carbonyl and C=C groups, respectively.…”

“…(38) Next, the bands at 1122.75 and 1661.52 cm −1 correspond to the C-O stretching vibrations of the carbonyl and C=C groups, respectively. (29) PAMAM exhibits two adsorption bands at 1654.14 and 1466.70 cm −1 , which are C=C in the presence of the carboxyl group in the polymer chain and the amide stretching group C(O)-NH, respectively. (29) The bands at 3329.05 and 1126.67 cm −1 could be assigned to the amine stretching group of the polymers, N-H. (29,38) Lastly, all the GO/PAMAM bands have nearly the same characteristic peaks of GO and PAMAM.…”

Silver Hexacyanoferrate (III) on a Hybrid Graphene Oxide/PAMAM Dendrimer Surface and Application as an Electrocatalyst in the Detection of Isoniazid

“…In spite of this, scarce papers reporting chemical modifications employing dendrimers for use in catalysis or metal adsorption are available .…”

“…Chemically cross‐linked materials based on the incorporation of amine‐terminations, such as PAMAM dendrimers, have been reported, where dendrimers have been linked to PAMAM collagen , silica gel , silsesquioxanes and, more recently, graphene oxide (GO) polyamidoamine (PAMAM) dendrimer nanocomposite hydrogels, used to improve material mechanical and adsorption properties .…”