Functionalization of graphene with self-doped conducting polypyrrole by click coupling

Madeshwaran Sekkarapatti Ramasamy; Sibdas Singha Mahapatra; Jae Whan Cho

doi:10.1016/j.jcis.2015.05.024

Functionalization of graphene with self-doped conducting polypyrrole by click coupling

J Colloid Interface Sci. 2015 Oct 1:455:63-70. doi: 10.1016/j.jcis.2015.05.024. Epub 2015 May 21.

Authors

Madeshwaran Sekkarapatti Ramasamy¹, Sibdas Singha Mahapatra¹, Jae Whan Cho²

Affiliations

¹ Department of Organic and Nano System Engineering, Konkuk University, Seoul 143-701, Republic of Korea.
² Department of Organic and Nano System Engineering, Konkuk University, Seoul 143-701, Republic of Korea. Electronic address: jwcho@konkuk.ac.kr.

PMID: 26057104
DOI: 10.1016/j.jcis.2015.05.024

Abstract

The synthesis of self-doped conducting polypyrrole-grafted graphene sheets (GS-PPy) for non-volatile memory applications is reported. First, the alkyne-modified graphene sheets (GS-alkyne) were covalently functionalized with a water-soluble polymer containing numerous anionic SO3(-) dopants by a copper-catalyzed click reaction. Then, polypyrrole was covalently grafted onto the functionalized graphene sheets by chemical oxidative polymerization to produce GS-PPy hybrids. The GS-PPy hybrids showed a uniform coating of PPy on the GS sheets, good dispersion in aqueous solutions, high electrical conductivity, and red-shifted absorption peak in the UV/Visible spectra. The non-volatile memory device composed of a Al/(GS-PPy/poly(vinyl alcohol))/Al structure, produced by spin coating of the aqueous GS-PPy/poly(vinyl alcohol) solution, showed a good write-once read-many times memory behavior, which was due to good electrical and optical absorption properties of the GS-PPy hybrids. The findings of this study provide a potential solution for the fabrication of water-soluble graphene-based hybrids for non-volatile resistive-memory-based applications.

Keywords: Click chemistry; Graphene; Hybrids; Nonvolatile memory; Polypyrrole.