Gold nanoparticle (GN) embedded silicon nanowire (SiNW) configuration was proposed as a new biosensor for label-free DNA detection to enhance the sensitivity. The electric current flow between two terminals, a source and a drain electrode, were measured to sense the immobilization of probe oligonucleotides and their hybridization with target oligonucleotides. The complementary target oligonucleotide, breast cancer DNA with 1. pM, was sensed. In addition, its sensing mechanism and limit of detection (LOD) enhancement was investigated through simulation. The results support that the LOD can be improved by reducing the SiNW doping concentration. This emerging architecture combined nanostructure of spherical GN and SiNW has high potential as a label-free biosensor due to its facile fabrication process, high thermal stability, immobilization efficiency with a thiol-group in a self-assembled monolayer (SAM), and improved sensitivity.
Bibliographical noteFunding Information:
This work was supported by the NRL Program of the Korea Science and Engineering Foundation (KOSEF) grant funded by the South Korean Government (MEST) ( ROA-2007-000-20028-0 and ROA-2007-000-20127-0 ) and the National Research and Development Program ( NRDP, 2005-01274 ) for the development of biomedical function monitoring biosensors, sponsored by the Korea Ministry of Science and Technology (MOST).
- Gold nanoparticle
- Oligonucleotide immobilization
- Silicon nanowire
ASJC Scopus subject areas
- Biomedical Engineering