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. 2015 Jul 2;5:11794. doi: 10.1038/srep11794

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(a) Measured and calculated Dirac point profiles for Gr/pABA as a function of pH at 1 mM and 1 M ionic strength. (b) Difference Dirac curves (obtained by subtracting the two curves in (a) before (black) and after modification (blue) giving an estimate of IEP as around 6 for Gr/pABA. (c) Measured and calculated Dirac point profiles for Gr/pANI as a function of pH at 1 mM and 1 M ionic strength. (d) Difference Dirac curves before (black) and after modification (red) giving an estimate of IEP to be around 4. The pI of bare graphene is less than 3.3 in both cases. See supplementary information about the details of model parameters (Figs S6–S8).