The electrical response of the detector developed in this work is that of the I-V response and the C-F response of the detector for different cations. Mathematically the I-V response of the detector is obtained by using the following formula:
Ri= (Ii– Iwi) / (Iwi).
For the C-F response of the detector:
Rc= (Ci– Cwi) / (Cwi).
Where, Ii= Current value at 5V with ion incubation
Iwi= Current value at 5V without ion incubation
Ci= Capacitance value at min frequency with ion incubation
Cwi= Capacitance value at min frequency without ion incubation
In the Optical calcium detector [35], developed previously the fall in reflection peak intensity, absorption loss and the scattering loss of the detector platform were under taken as parameters to study the response of the detector platform [35]. The detector showed appreciable response and selectivity towards calcium ion. In the mentioned optical detector the optical response, namely reflection peak intensity fall, scattering loss and absorption loss of the detecting platform was found to be 8.49%, 13.09% and 2.16% for calcium ion, 8.65%, 17.88% and 3.60% for mixture ion solution, 1.25%, 2.49% and 0.10% for Magnesium, 0%, 0.80% and 0.26% for Manganese, 1.40%, 2.25% and 0.13% for Potassium and 0.76%, 0.32% and 0.07% for sodium [35]. In this work, the electrical response of the detector is obtained by calibrating the change in the I Vs V response of the detector as well as the C Vs F change of the detecting platform. The I-V response of the detector is found to be 303.84% for calcium ion, 253.84% for mixture ion solution, 7.69% for magnesium, 100% for manganese, 69.3% for potassium and 42.3% for sodium. The C Vs F response of the detector shows a response of 178% for calcium ion, 175% for mixture ion solution, 37.5% for magnesium, 115% for manganese, 92.55% for potassium and 95% for sodium. Thus both the electrical response is observed to be highest for calcium ion and mixture ion solution in comparison to all the ions. It is clearly visible from the response obtained from the electrical parameters that the detector developed in this work shows appreciable discrimination towards calcium ion, that is more evidently established when the electrical calcium detecting platform is tested with mixture ion solution and the response being consistent with the response of the electrical detector for calcium ion only, as depicted in Fig. 6. Both the electrical parameter response of the detector shows highest response for calcium ion and for mixture ion solution, showing evidence of the selectivity of the detector towards calcium ion.
Comparing the optical response [35] with the electrical response of the detector surface developed in this work, it is found that the response of the electrical detector is more profound and appreciably consistent with the response of the optical detector, as clearly visible in Fig. 6.The electrical detector developed shows considerably selective towards calcium ion as in the case of the previously developed optical detector. This may find use in the designing of multi-parametric calcium sensor with better selectivity and sensitivity.