Table 3.

Resistance value R₁ obtained from fitting of the Nyquist plot of nanoporous SnO₂ electrodes with different film thickness after liquid phase silanization, after immobilization and after complementary or non-complementary DNA hybridization with target concentration of 2 µM.

Film Thickness (nm)	DNA Target Molecules	R1 (Ω)				∆R1/R1 (%)
		SnO2 Film	Silanized	ss_DNA	ds_DNA
220 ± 20	complementary	84782	146577	51974	24743	−54 ± 5
	non-complementary	87250	136078	45541	42543	−6 ± 2
380 ± 20	complementary	66496	115162	95137	43301	−59 ± 5
	non-complementary	67596	127038	101959	95300	−5 ± 2
940 ± 50	complementary	21276	47176	23047	15413	−33 ± 4
	non-complementary	20486	56258	28471	26605	−6 ± 2