Electronic Supplementary Information

Fabrication of Two-dimensional Hybrid Sheets by Decorating Insulating PANI on

Reduced Graphene Oxide for Polymer Nanocomposites with Low Dielectric Loss and

High Dielectric Constant

Mi Li,a Xingyi Huanga* Chao Wu,a Haiping Xu,b Pingkai Jiang,a* Toshikatsu Tanakac

aDepartment of Polymer Science and Engineering, Shanghai Key Lab of Electrical Insulation and Thermal Aging,

Shanghai Jiao Tong University, Shanghai 200240, China,

bSchool of Urban Development and Environmental Engineering, Shanghai Second Polytechnic University, Shanghai

201209, China

cIPS Research Center, Waseda University, Kitakyushu, Fukuoka, Japan

Electronic Supplementary Material (ESI) for Journal of Materials ChemistryThis journal is © The Royal Society of Chemistry 2012

Figure S1. General XPS spectra of PANI, rPANI, GO and rGO (a), deconvoluted N1s spectra of PANI (b) and rPANI

(c) and the deconvoluted C1s spectra of GO (d) and rGO (e). According to Figure S1b, a peak of nitrogen cationic

amine appears, whereas it is not observed in deconvoluted N1s spectra of rPANI@rGO. The appearance of such a

peak in rPANI may be attributed to the absorption of protonic acid from atmosphere.

Electronic Supplementary Material (ESI) for Journal of Materials ChemistryThis journal is © The Royal Society of Chemistry 2012

Table S1 Relative percentages of carbon and functional groups of PANI@GO, rPANI@rGO, GO and rGO

Sample C (sp2) % C(sp3) % C-N % C-O % C=O % O-C=O %

PANI@GO 17.18 35.30 4.76 35.81 6.13 0.82

rPANI@rGO 55.55 22.95 10.94 5.33 2.98 1.57

GO 19.20 17.17 - 57.56 5.12 0.95

rGO 59.85 15.33 4.54 7.24 8.49 4.55

Table S2 Relative percentages of amine groups of PANI@GO, rPANI@rGO, PANI and rPANI

Sample Benzenoid amine % Quinoid amine % Nitrogen cationic amine %

PANI@GO 56.71 0 43.29

PANI@rGO 87.17 12.73 0

ANI 52.62 0 47.38

rPANI 85.11 3 11.89

Figure S2. SEM images of the PMMA/rPANI@rGO composite with rGO/PMMA ratio of 4% (a), PMMA/rGO

Electronic Supplementary Material (ESI) for Journal of Materials ChemistryThis journal is © The Royal Society of Chemistry 2012

composite with rGO/PMMA ratio of 4% (b, c) and neat PMMA (d). Images of (a), (b) and (d) have the same

magnification of 2000, while (c) is enlarged from (b) and has a magnification of 5000. One can see from (c) that

individual rGO sheets are not easily found and the sample shows large sized rGO aggregations, which forms sharp

contract with Figure 8.

Figure S3. Frequency dependence of dielectric constant (a), dielectric loss tangent (b) and conductivity (c) of the

PMMA/rGO composites.

Figure S4. Frequency dependence of dielectric constant (A), dielectric loss tangent (B) of the PMMA/GO and

PMMA/rPANI composites. a) The fraction of 2% means the ratio of rPNAI/PMMA in PMMA/rPNAI is equal to the

ratio of rPNAI/PMMA in PMMA/rPNAI@rGO with rGO/PMMA ratio of 2%, b) The fraction of 4% means the ratio

of rPNAI/PMMA in PMMA/rPNAI is equal to the ratio of rPNAI/PMMA in PMMA/rPNAI@rGO with rGO/PMMA

ratio of 4%

Electronic Supplementary Material (ESI) for Journal of Materials ChemistryThis journal is © The Royal Society of Chemistry 2012