Fig. 6. Measurement of the capacitance variation with time for the AAO touch sensor due to the contact with a suspension of Escherichia coli bacteria. The values were recorded from (a) sample A1 (E. coli grown for 1 h) (b) sample A4 (E. coli grown for 4 h) (c) sample A8 (E. coli grown for 8 h) and (d) control sample AC that does not contain E. coli as it was only immersed in the LB liquid medium. The triangular dots (identified as AAO) correspond to the recorded signal from the clean sensor (i.e. without liquid medium and E. coli), which is used as reference.
