Table 2.

Lateral packing density of the PNA and DNA probes.

Entry	Probe density, nm−2
22-mer PNA/SAM	0.157 ± 0.037
20-mer PNA/SAM	0.225 ± 0.043
15-mer PNA/SAM	0.130 ± 0.022
20-mer DNA/SAM	0.076 ± 0.014
15-mer DNA/SAM	0.069 ± 0.012