683460.fig.004a
(a)
683460.fig.004b
(b)
683460.fig.004c
(c)
683460.fig.004d
(d)
Figure 4: A capacitance as a function of frequency for GNPs-modified SiO2 thin films for DNA immobilization and hybridization detection after (a) 30 minutes, (b) 1 hour, (c) 2 hours, and (d) 4 hours.