Graphene oxide-based supramolecular hydrogels for making nanohybrid systems with Au nanoparticles

Adhikari, Bimalendu ; Biswas, Abhijit ; Banerjee, Arindam (2012) Graphene oxide-based supramolecular hydrogels for making nanohybrid systems with Au nanoparticles Langmuir, 28 (2). pp. 1460-1469. ISSN 0743-7463

Full text not available from this repository.

Official URL: http://pubs.acs.org/doi/abs/10.1021/la203498j

Related URL: http://dx.doi.org/10.1021/la203498j

Abstract

In the presence of a small amount of a proteinous amino acid (arginine/tryptophan/histidine) or a nucleoside (adenosine/guanosine/cytidine), graphene oxide (GO) forms supramolecular stable hydrogels. These hydrogels have been characterized by field-emission scanning electron microscopy (FE-SEM), atomic force microscopy (AFM), X-ray diffraction (XRD) analysis, Raman spectroscopy, and rheology. The morphology of the hydrogel reveals the presence of nanofibers and nanosheets. This suggests the supramolecular aggregation of GO in the presence of an amino acid/nucleoside. Rheological studies of arginine containing a GO-based hydrogel show a very high G′ value (6.058 × 104 Pa), indicating the rigid, solid-like behavior of this gel. One of these hydrogels (GO-tryptophan) has been successfully utilized for the in situ synthesis and stabilization of Au nanoparticles (Au NPs) within the hydrogel matrix without the presence of any other external reducing and stabilizing agents to make Au NPs containing the GO-based nanohybrid material. The Au NPs containing the hybrid hydrogel has been characterized by using UV/vis spectroscopy, X-ray diffraction (XRD), and transmission electron microscopy (TEM). In this study, gold salt (Au3+) has been bioreduced by the tryptophan within the hydrogel. This is a facile “green chemical” method of preparing the GO-based nanohybrid material within the hydrogel matrix. The significance of this method is the in situ reduction of gold salt within the gel phase, and this helps to decorate the nascently formed Au NPs almost homogeneously and uniformly on the surface of the GO nanosheets within the gel matrix.

Item Type:Article
Source:Copyright of this article belongs to American Chemical Society.
ID Code:99674
Deposited On:03 Nov 2016 09:16
Last Modified:03 Nov 2016 09:16

Repository Staff Only: item control page