## 3 Results
### Measurements of Magnitude Level of Skin Bioimpedance
In the case of the 20%Ag/PPY hybrid nanocomposite sensor, the same tendency of decreasing the total bioimpedance with frequency is observed, but compared to neat PPY, the total bioimpedance values are increased due to Ag NPs incorporated in the polymer chain and obstruction of polymer electron gaps. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline \hline \multirow{2}{*}{ \begin{tabular}{c} **Frequency,** \\ **[kHz]** \\ \end{tabular}  } & \multicolumn{2}{c}{**LPD**} & \multicolumn{2}{c}{**RC**} & \multicolumn{2}{c}{**CO**} & \multicolumn{2}{c}{**FB**} & \multicolumn{2}{c}{**CB**} & \multicolumn{2}{c}{**II**} \\  & **59 Years Old** & **32 Years Old** & **50 Years Old** & **43 Years Old** & **52 Years Old** & **46 Years Old** \\ \cline{2-11}  & \multicolumn{2}{c}{**Impedance,**} & \multicolumn{2}{c}{**Impedance,**} & \multicolumn{2}{c}{**Impedance,**} & \multicolumn{2}{c}{**Impedance,**} & \multicolumn{2}{c}{**Impedance,**} & \multicolumn{2}{c}{**Impedance,**} \\  & \multicolumn{2}{c}{**[k\(\Omega\)]**} & \multicolumn{2}{c}{**[k\(\Omega\)]**} & \multicolumn{2}{c}{**[k\(\Omega\)]**} & \multicolumn{2}{c}{**[k\(\Omega\)]**} & \multicolumn{2}{c}{**[k\(\Omega\)]**} & \multicolumn{2}{c}{**[k\(\Omega\)]**} & \multicolumn{2}{c}{**[k\(\Omega\)]**} \\ \cline{2-11}  & \multicolumn{2}{c}{**PPY**} & \multicolumn{2}{c}{**20\%Ag/**PPY**} & \multicolumn{2}{c}{**20\%Ag/**PPY**} & \multicolumn{2}{c}{**PPY**} & \multicolumn{2}{c}{**20\%Ag/**PPY**} & \multicolumn{2}{c}{**PPY**} & \multicolumn{2}{c}{**20\%Ag/**PPY**} & \multicolumn{2}{c}{**20\%Ag/**PPY**} & \multicolumn{2}{c}{**20\%Ag/**PPY**} \\ \hline
1 & 16 & 41 & 65.70 & 450 & 16 & 100 & 80 & 220 & 155 & 380 & 58.70 & 380 \\
10 & 3.87 & 12 & 12.70 & 54.8 & 3.55 & 18.20 & 15.54 & 31.30 & 24 & 43 & 13.04 & 38.80 \\
50 & 1.82 & 3.24 & 4.23 & 12.9 & 1.82 & 4.75 & 5.30 & 7.20 & 7.12 & 10 & 5.02 Moreover, the measurements performed to obtain variation of electric impedance of electrodes with frequency (Figure 12) shows the influence of Ag NPs incorporated in the polymer. On that account for electrodes realised with the sensitive material PPY, the impedance of electrode was in the range of 236.59-488.8 \(\Omega\) while for electrodes that realised with hybrid nanocomposites 10%Ag/PPY was in the range of 124-143.2 \(\Omega\) and in the range of 92.15-102.84 \(\Omega\) for hybrid nanocomposites 20%Ag/PPY. In addition, the total bioimpedance values obtained at a low frequency of 1 kHz are increased in the case of female subjects, with values between of 220-380 k\(\Omega\) compared to those of the male subjects between of 41-100 k\(\Omega\), except for a single male whose total bioimpedance value is 450 k\(\Omega\) (Figure 15). The same tendency was observed for measurements performed at 300 kHz. Table 3 presents the experimental data regarding the total electric bioimpedance variation with frequency for three of the subjects, a man (LPD) and two women (CB and FB). For comparison, the measurements were taken by using three bioimpedance sensors made with sensitive materials: PPY and 10%Ag/PPY and 20%Ag/PPY hybrid nanocomposites. In this case, a decrease of the total bioimpedance with frequency for all the three human subjects tested (Table 3) was observed. On the frequency domain tested of 1-300 kHz, a more pronounced decrease is found at high frequencies (250-300 kHz), especially for the bioimpedance sensor made with sensitive material 10%Ag/PPY nanocomposite, compared to bioimpedance sensors made with PPY and 20%Ag/PPY nanocomposite. Values of 16-220 k\(\Omega\) for 1 kHz to 1.80-0.512 k\(\Omega\) for 300 kHz were observed. At the frequency of 300 kHz, the lowest bioimpedance values were obtained, respectively 0.512 k\(\Omega\) for men LPD, 1.44 k\(\Omega\) and 1.33 k\(\Omega\) for women CB and FB. These trends are also illustrated in Figures 16-18. Figure 15: The magnitude of total electric bioimpedance versus frequency measurements of 20%Ag/PPY nanocomposite bioimpedance sensor for all subjects.