Table 1 Calculation of current density of Au film and VSNEA based on CV measurements

Q_{bare, film} = 1.636 × 10^-2C

Q_{bare, NWs} = 1.163 × 10^-1C

Q_{peptide, film} = 1.529 × 10^-2C

Q_{peptide, NWs} = 4.899 × 10^-2C

A_film = 4.9 × 10^-5 m²

A_NWs = 4.925 × 10^-8 m²

$\begin{array}{l}{J}_{\mathrm{bare},\mathrm{film}}=\frac{Q_{\mathrm{bare},\mathrm{film}}}{A_{\mathrm{film}}\times 1s}\hfill \\ \begin{array}{l}=\frac{1.636\times {10}^{-2}C}{4.9\times {10}^{-5}{m}^2\times 1s}\\ =3.339\times {10}^{2}A/m^2\end{array}\hfill \end{array}$

$\begin{array}{l}{J}_{\mathrm{bare},\mathrm{NWs}}=\frac{Q_{\mathrm{bare},\mathrm{NWs}}}{A_{\mathrm{NWs}}\times 1s}\hfill \\ \begin{array}{l}=\frac{1.163\times {10}^{-1}C}{4.925\times {10}^{-8}{m}^2\times 1s}\\ =2.361\times {10}^{6}A/m^2\end{array}\hfill \end{array}$

$\frac{J_{\mathrm{bare},\mathrm{NWs}}}{J_{\mathrm{bare},\mathrm{film}}}=\frac{2.361\times {10}^{6}A/m^2}{3.339\times {10}^{2}A/m^2}=7071$

$\begin{array}{l}{J}_{\mathrm{peptide},\mathrm{film}}=\frac{Q_{\mathrm{peptide},\mathrm{film}}}{A_{\mathrm{film}}\times 1s}\hfill \\ \begin{array}{l}=\frac{1.529\times {10}^{-2}C}{4.9\times {10}^{-5}{\mathrm{m}}^2\times 1s}\\ =3.120\times {10}^{2}A/m^2\end{array}\hfill \end{array}$

$\begin{array}{l}{J}_{\mathrm{peptide},\mathrm{NWs}}=\frac{Q_{\mathrm{peptide},\mathrm{NWs}}}{A_{\mathrm{NWs}}\times 1s}\hfill \\ \begin{array}{l}=\frac{4.899\times {10}^{-2}C}{4.925\times {10}^{-8}{m}^2\times 1s}\\ =9.947\times {10}^{5}A/m^2\end{array}\hfill \end{array}$

$\frac{J_{\mathrm{peptide},\mathrm{NWs}}}{J_{\mathrm{peptide},\mathrm{film}}}=\frac{9.947\times {10}^{5}A/m^2}{3.120\times {10}^{2}A/m^2}=3188$