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

作者：Jang Ji Hoon; Rangappa Dinesh^*; Kwon Young Uk; Honma Itaru

来源：Journal of Materials Chemistry, 2011, 21(10): 3462-3466.

DOI：10.1039/c0jm02472d

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 similar to 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.

• 出版日期2011