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Nyquist plots of 220 nm thick bio-modified SnO2 nanoporous film with (a) vapour phase and (b) liquid phase silanization processes. DNA complementary hybridization was performed with target concentration of 2 µM. The filled symbols correspond to experimental data and the continuous lines to fitting data. The inset shows the corresponding typical fluorescence micrograph after hybridization of complementary target labelled with Cy3.
