Direct preparation of 1-PSA modified graphene nanosheets by supercritical fluidic exfoliation and its electrochemical properties

Ji Hoon Jang, Dinesh Rangappa, Young Uk Kwon, Itaru Honma

    Research output: Contribution to journalArticlepeer-review

    74 Citations (Scopus)

    Abstract

    In this paper, we report on 1-pyrene sulfonic acid sodium salt (1-PSA) modified graphene nanosheets (imGNS) prepared by a novel one-pot in situ supercritical fluid exfoliation and modification reaction. The 1-PSA molecules on the surface of the graphene layers acted as electron withdrawing groups resulting in an electron transfer from the GNS surface to the 1-PSA molecules. This was confirmed by a red shift of 1572∼1576 cm-1, in the graphitic 'G' band of the Raman spectra. This novel approach led to an increase in the yield of mono to double layer graphene sheets (about 60%). The charge-discharge measurement shows improved Li-ion charge-discharge properties of the imGNS with an increase in the concentration of 1-PSA molecules in comparison with starting graphite materials. This report provides a new direction for graphene exfoliation and surface modification for technological applications.

    Original languageEnglish
    Pages (from-to)3462-3466
    Number of pages5
    JournalJournal of Materials Chemistry
    Volume21
    Issue number10
    DOIs
    Publication statusPublished - 2011 Mar 14

    ASJC Scopus subject areas

    • Chemistry(all)
    • Materials Chemistry

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