Formulation of chemically reduced graphene oxide assembly with poly(4-vinyl pyridine) through noncovalent interaction

Mi Yeon Lee, Su Hyun Nam, Jung Yup Lee, Sangkug Lee, Cheol Min Park, Chul Jong Han, Sung Young Park, Insik In

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Soluble chemically reduced graphene oxide (RGO)/poly(4-vinyl pyridine) (P4VP) assembly was attempted by totally noncovalent approach. Chemical reduction of P4VP/GO mixture by hydrazine produced soluble RGO/P4VP assembly with long term stability. Prepared RGO/P4VP assembly showed pH-dependent variation of optical transmittance. Transmittance of RGO/P4VP assembly solution at pH 2.0 dramatically increased more than 200% of transmittance of assembly at pH 6. This optical transmittance change was fully reversible. The detailed morphological features of assemble was evaluated by dynamic light scattering (DLS) and atomic force microscopy (AFM). It is estimated that RGO/P4VP assemblies were well separated each other at pH 6, enabling much higher optical absorption of RGO plates. At pH 2, protonation of pyridine ring occurs and this might hamper effective noncovalent interaction between RGO plate and protonated P4VP chains, forming bigger aggregates having less chance for optical absorption. This pH-dependent optical modulation of RGO/P4VP assembly can be useful for the designing of pH-sensor, removable nanocatalyst, and targeted drug delivery, etc.

Original languageEnglish
Pages (from-to)2538-2543
Number of pages6
JournalJournal of Applied Polymer Science
Volume130
Issue number4
DOIs
Publication statusPublished - 2013 Nov 15

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All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Surfaces, Coatings and Films
  • Polymers and Plastics
  • Materials Chemistry

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