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(a) Schematic illustration of the network devices and a typical atomic force microscope image showing strands of SWNT and catalyst particles in the active channel area. (b) Sequences of the synthetic oligonucleotide, , and their complementary and single-base mismatched target analytes. (c) Structure of PIND and PIND-Os intercalators.
Typical gate voltage dependence of the normalized drain current (normalized by the initial drain current of their bare device at ) for (a) a CNNFET bare device immobilized with , hybridized with complementary target analyte, (b) a CNNFET bare device, immobilized with , hybridized with single-base mismatched target analyte, and immersed with the PIND-Os intercalator (source-drain bias was kept at ).
(a) Statistical comparisons of sequential reduction in for CNNFETs (left column: eight devices in total with channel lengths of 5, 10, 50, 75, and ; right column: six devices in total with channel lengths of 5, 25, and ) after immobilization, hybridization (complementary: hybridized with complementary DNA; mismatched: hybridized with single base mismatched DNA), and intercalation. (b) XPS comparison of the Os contents for two selected CNNFETs after PIND-Os intercalation.
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