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. 2017 Nov 16;7:15734. doi: 10.1038/s41598-017-16028-7

Figure 2.

Figure 2

Fluorescence imaging of the FET-DNA sensor surface. (A) PNA probe (blue) with a spacer (orange) immobilized on gold electrode using thiotic acid (gray). (B) and (C) PNA probe1 (6.8 µM) with TTTT-spacer (gray) or PNA probe2 (1.5 µM) with 8-Amino-3,6-dioxaoctanoic acid spacer (white) on gold electrode surface was hybridized with complementary 6-FAM-ssDNA (specific) or with non-complementary 6-FAM-ssDNA (control).