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Caption : figure s2. schematic redox reaction of bpa at the gs electrode. 

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Caption : figure s5. contact angle determination by dropping 10 µl of water on the graphite sheet a) before and b) after electrochemically treating at +1.5 v for 30 s. 

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Caption : figure s9. sem images of a) graphite sheet electrode and b) glassy carbon electrode. 

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Caption : figure s10. effect of reducing possible interfering species on the voltammetric signal of bpa, presence of 2.0 µmol l−1 bpa at bpa: interfering ratio (1:1): catechol, hydroquinone, dopamine, nitrite, sulphite, and phenol. voltammetric conditions: pulse amplitude: 80 mv; pulse width: 80 ms, ν = 10 mv s−1.