원문정보
초록
영어
Single-walled carbon nanotubes (SWNTs) have attracted considerable attention as a platform material for manufacturing miniaturized label-free biosensors.1 Here, we developed the network density-modulated SWNT sensor for the label-free DNA detection.2 The nanotube networks
with various densities are fabricated via vacuum filtration method and incorporated with two-terminal resistor. The SWNT network-based devices exhibit linear I-V characteristics, resulting in the network density over the percolation threshold. We found that SWNT films having low
network densities giving the conductance of 0.74 × 10-7 < Gbare < 2.00 × 10-7 allow detection of DNA hybridization with higher sensitivities compared with the high density networks. This study show the capability of label-free detection based on the SWNT networks showing metallic
like electrical behavior. [This research was supported by WCU program through the Korea Science and Engineering Foundation funded by the Ministry of Education, Science and Technology (R32-2008-000-10142-0)].